US 9,541,429 B2Grant
Systems, methods, and devices for fluid data sensing
Issue Date:2017-01-10
•21 Claims
•12 Drawing Sheets
Abstract
A fluid sensing device includes an outer body, an inner body coupled to the outer body by one or more inner body support struts and extending at least partially out from the outer body, and an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body being coupled to the outer body by one or more aft body support struts. The inner body includes a hollow interior for housing one or more inner body sensors, and the aft body houses one or more aft body sensors. The fluid sensing device can measure one or more parameters of fluid flow at high angularity, such as total temperature and total pressure, locally and simultaneously, allowing additional fluid parameters, such as local entropy, to be calculated.
Metadata
Assignee
- University of Kansas
Inventors
- Saeed Farokhi
- Ray R. Taghavi
- Shawn S. Keshmiri
Application Information
Application Number:US 14/728,347
Filing Date:2015-06-02
Priority Date:2014-06-02
Art Unit:2855
Classifications
IPC:
G01F1/46G01F1/05G01P5/165G01L19/00
Field of Search:
G01F 1/46G01L 9/00B60C 23/02G01J 5/00G01K 1/16
Patent Drawings (12 sheets)
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a non-provisional application claiming priority under 35 U.S.C. §119(e) to U.S. patent application Ser. No. 62/006,437, filed on Jun. 2, 2014 and titled “SYSTEMS, METHODS, AND APPARATUSES FOR DATA SENSING,” and to U.S. patent application Ser. No. 62/100,822, filed on Jan. 7, 2015 and titled “SYSTEMS, METHODS, AND APPARATUSES FOR DATA SENSING,” which applications are expressly incorporated herein in their entirety by this reference.
BACKGROUND
[0002] The present disclosure relates generally to sensing one or more fluid parameters. More specifically, the present disclosure relates to systems, devices, and methods for accurately measuring fluid flow velocity and/or other fluid parameters at high/low velocities and/or at indirect angular flows relative to a measurement probe.
[0003] Fluid flow velocity measurements are typically determined by measuring pressure using some variation of a Pitot tube. The accuracy of these measurements, however, may be limited at high/low fluid flow velocities and/or in conditions when the flow is not parallel to the measuring device. For example, in aircraft or marine craft applications, measurement accuracy may suffer when the craft is changing direction or otherwise inducing pitch and/or yaw angles, such as during intense maneuvering or in loss of control situations, which are often among the situations where reliable data is typically most needed.
[0004] In order to operate in such dynamic fluid flow environments, typical fluid flow sensor systems require multiple sensors positioned at separate locations on the craft or other measuring structure as well as complex compensation calculations to interpret the separate readings and compensate for angular flow errors in the sensor output. The requirement of multiple sensors and the necessity of gathering and interpreting separate signals into a meaningful measurement undesirably adds to the cost and complexity of fluid sensing, particularly in dynamic fluid flow environments.
[0005] In addition, typical devices used for measuring fluid flow parameters are configured to measure a single parameter only and/or are unable to provide accurate readings at high/low fluid flow velocities and/or indirect flow angles. Typical systems intended to measure more than one fluid parameter may thus require multiple sensors, and the use of multiple sensors may result in readings that are not common to a localized area and/or that are not simultaneous, limiting the usefulness of the resulting readings for measuring certain fluid parameters.
[0006] Furthermore, inaccuracy of typical devices used for measuring angular fluid flow parameters propagates into estimation of local wind velocity and causes overestimation or underestimation of the wind speed.
BRIEF SUMMARY
[0007] The present disclosure relates to devices, systems, and methods for data sensing in a flowing fluid environment. One or more embodiments of the present disclosure may be configured to provide accurate fluid flow velocity readings (e.g., by measuring pressure) and/or other fluid parameters at high/low fluid flow velocities and/or at high flow angularity. One or more embodiments may be useful for monitoring the status and/or performance of a machine intended for operation in an environment that includes fluid flow (e.g., a fluid of air, water, other gasses, and/or other liquids).
[0008] One or more embodiments relate to a fluid sensing device, including: an outer body having a fore side, an aft side, and an interior space, the outer body including a fluid inlet disposed at the fore side; an inner body extending at least partially out of the fluid inlet of the outer body along a longitudinal axis; and an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body including an opening oriented toward the fore side of the outer body, and the aft body housing one or more aft body sensors; wherein the inner body is configured to induce the Coanda effect in at least a portion of a fluid contacting the inner body at an angle transverse to a longitudinal axis of the inner body.
[0009] One or more embodiments relate to an airflow sensor for measuring airflow on an aircraft, the airflow sensor including: an outer body having a fore side, an aft side, and an interior space, the outer body including a fluid inlet disposed at the fore side; an inner body extending at least partially out of the fluid inlet of the outer body along a longitudinal axis, the inner body including a hollow interior configured such that fluid within the hollow interior is in a stagnation state, the hollow interior housing one or more inner body sensors, the inner body including a fluid permeable surface covering at least a portion of the inner body and the hollow interior and configured to allow passage of a fluid from the interior space into the hollow interior; and an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body including an opening oriented toward the fore side of the outer body, and the aft body housing one or more aft body sensors; wherein the inner body is configured to induce the Coanda effect in at least a portion of a fluid contacting the inner body at an angle transverse to a longitudinal axis of the inner body.
[0010] One or more embodiments relate to a method of sensing a fluid parameter of a flowing fluid, the method including: positioning a fluid sensing device within a flowing fluid, the fluid sensing device including an outer body having a fore side, an aft side, and an interior space, the outer body including a fluid inlet disposed at the fore side, an inner body extending at least partially out of the fluid inlet of the outer body along a longitudinal axis, and an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body including an opening oriented toward the fore side of the outer body, and the aft body housing one or more aft body sensors, wherein the inner body is configured to induce the Coanda effect in at least a portion of a fluid contacting the inner body at an angle transverse to a longitudinal axis of the inner body; and receiving a reading from the one or more aft body sensors.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] To further clarify the above and other advantages and features of the present disclosure, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. For better understanding, like elements have been designated by like reference numbers throughout the various accompanying figures. Though some elements in some figures have the same reference number as elements in other figures, these elements may be the same or may differ. While some of the drawings are schematic representations of concepts, at least some of the drawings may be drawn to scale. Understanding that these drawings depict only typical embodiments of the disclosure and are not therefore to be considered limiting of its scope, the embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
[0012] FIG. 1 illustrates an embodiment of a fluid sensing device according to the present disclosure;
[0013] FIGS. 2-4 illustrate cutaway views of embodiments of fluid sensing devices according to the present disclosure;
[0014] FIG. 5 illustrates an embodiment of an inner body according to the present disclosure showing a surface feature of the inner body;
[0015] FIGS. 6-7 illustrate cutaway views of embodiments of fluid sensing devices including power compartments according to the present disclosure;
[0016] FIG. 8 illustrates an embodiment of a fluid sensing device according to the present disclosure suitable for attachment to a surface; and
[0017] FIGS. 9-11 illustrate results of wind tunnel testing comparing an embodiment of a fluid sensing device according to the present disclosure with a Pitot tube probe.
DETAILED DESCRIPTION
[0018] The present disclosure relates to devices, systems, and methods for data sensing in a flowing fluid environment. One or more embodiments of the present disclosure may be configured to provide accurate fluid flow velocity readings (e.g., by measuring pressure) and/or other fluid parameters at high/low fluid flow velocities and/or at high flow angularity. One or more embodiments may be useful for monitoring the status and/or performance of a machine intended for operation in an environment that includes fluid flow (e.g., a fluid of air, water, other gasses, and/or other liquids). For example, one or more embodiments may be useful for sensing fluid parameters in an aircraft, marine craft, turbine, propeller, impeller, wind farm, aerospace, industrial tool, industrial, and/or wind tunnel application, including testing and/or monitoring of various elements or aspects of such applications. One or more embodiments may relate to airflow sensors (e.g., for use on an aircraft).
[0019] One or more embodiments of the present disclosure may be capable of measuring, at levels of sufficient accuracy, both total temperature and total pressure locally (e.g., within the same probe) and/or simultaneously for determining the thermodynamic parameter local entropy.
[0020] FIG. 1 illustrates an embodiment of a fluid sensing device 100 including an outer body 102 and an inner body 104 extending at least partially out of the outer body 102. As shown, the outer body 102 can be formed with a fluid inlet 106 disposed at the fore side 108 of the fluid sensing device 100. As described in further detail below, the inner body 104 can extend into the interior space of the outer body 102 where it can be secured by one or more inner body struts (not shown).
[0021] The inner body 104 may extend beyond the fluid inlet 106 a distance in the fore direction, as illustrated. The length at which the inner body 104 extends beyond the fluid inlet 106 and the diameter of the outer body 102 (e.g., the inner diameter) can define an L/D ratio of the fluid sensing device 100. The L/D ratio range is a design parameter and may vary based on specific application. For example, in some embodiments, the L/D ratio may vary from 0.1 to 5, or from 0.25 to 3, or from 0.5 to 1.5. For example, in some embodiments, the L/D ratio may be 0.1, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.25, 4.5, 4.75, or 5.0.
[0022] The diameter of the outer body 102 (e.g., the inner diameter of the outer body) and the diameter of the inner body 104 (e.g., the outer diameter of the inner body) can define a Do/Di ratio of the fluid sensing device 100. The Do/Di ratio range is a design parameter and may vary based on specific application. For example, in some embodiments, the Do/Di may range from 1.25 to 5, or from 1.5 to 3. For example, in some embodiments, the Do/Di ratio may be 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.25, 4.5, 4.75, or 5.0.
[0023] As illustrated, the outer body 102 and/or inner body 104 can be formed with circular and/or curved cross-sections. In other embodiments, an outer body 102 and/or inner body 104 may be formed with an ovoid cross-section, an ellipsoid cross-section, or with a triangular, square, rectangular, or other polygonal cross-section. The inner body 104 may have a contour that tapers in the fore direction, as shown. For example, the contour may be formed with an ellipsoid of revolution shape or ogive shape (e.g., tangent ogive, elliptical ogive, von Karman ogive, or other shapes). The inner body 104 may be coaxially aligned with the outer body 102, as in the illustrated embodiment. In other embodiments, an inner body may be offset from a longitudinal axis of an outer body and/or may have a longitudinal axis that is transverse to a longitudinal axis of an outer body.
[0024] As described in more detail below, the fluid sensing device 100 may include an aft body 112 at least partially disposed near an aft side 110 of the fluid sensing device 100. As shown, the aft body 112 may extend a distance beyond the outer body 102 in an aft direction. In other embodiments, the aft body 112 may be disposed fully within the outer body 102. The aft body 112 may be formed with a circular cross-section, as shown (e.g. as a stagnation tube). In other embodiments, an aft body can be formed with an ovoid cross-section, or with a triangular, square, rectangular, or other polygonal cross-section. The aft body 112 may be coaxially aligned with the outer body 102, as shown. In other embodiments, an aft body may be offset from a longitudinal axis of an outer body and/or may have a longitudinal axis that is transverse to a longitudinal axis of an outer body.
[0025] The diameter of the outer body 102 (e.g., the inner diameter) and the diameter of the aft body 112 (e.g., the inner diameter) can define a Do/Da ratio of the fluid sensing device 100. The Do/Da may ratio range is a design parameter and may vary based on specific application. In some embodiments, the Do/Da ratio may range from 1.1 to 5, or from 1.25 to 3. For example, in some embodiments, the Do/Da ratio may be 1.1, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.25, 4.5, 4.75, or 5.0.
[0026] The length of the outer body 102 and the length of the aft body 112 can define a Lo/La ratio of the fluid sensing device 100. The The Lo/La ratio is a design parameter and may vary based on specific application. In some embodiments, the Lo/La ratio may range from 1.5 to 4, or from 1.75 to 3.5, or from 2 to 3. For example, in some embodiments, the Lo/La ratio may be 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5, 3.75, or 4.0.
[0027] FIG. 2 illustrates a cutaway view of another embodiment of a fluid sensing device 200. As shown, an outer body 202 can include a contoured lip 214. The contoured lip 214 can be configured to widen the angularity of the fluid capture dome, as represented by line 216. For example, the angled surface of the contoured lip 214 can provide a wider capture angle for receiving fluid into an interior space 218 of the outer body 202. This can beneficially reduce or eliminate sensing errors resulting from high fluid flow angularity (e.g., because of reduced fluid flow into the interior space 218 of the outer body 202). The contoured lip 214 can have an elliptic or any other curved contour, as illustrated. In other embodiments, a contoured lip can have a straight edge and/or non-curved taper.
[0028] The illustrated fluid sensing device 200 can include one or more inner body struts 220 configured to secure an inner body 204 to the outer body 202. The fluid sensing device 200 may include two inner body struts 220, which may be oppositely disposed (e.g., separated by 180 degrees), as illustrated. In other embodiments, a fluid sensing device may include a single inner body strut, or may include a plurality of inner body struts arranged around an inner body (e.g., separated by 30, 60, 90, 120, or 150 degrees).
[0029] The inner body struts 220 may have a tapered and/or winged shape, with a portion coupled to the inner body 204 being wider than a portion coupled to the outer body 202, as illustrated. The inner body struts 220 may angle toward the aft side 210, as illustrated. In other embodiments, one or more inner body struts may not taper, or may be wider at a portion coupling to an outer body than at a portion coupling to an inner body. In other embodiments, one or more inner body struts may angle toward a fore side or may not angle toward a fore or aft side.
[0030] The inner body 204 may have a hollow interior 222, as illustrated. The inner body 204 may include a fluid permeable surface 224 covering at least a portion of the surface of the inner body 204. The fluid permeable surface 224 can be configured to allow the passage of fluid from the interior space 218 and/or from outside of the fluid sensing device 200 into the hollow interior 222 of the inner body 204. For example, in some embodiments, the fluid permeable surface 224 can be formed as a perforated wall. In other embodiments, a fluid permeable surface can include slots, holes, slits, channels, and/or other passages allowing fluid to pass from an interior space to a hollow interior within an inner body.
[0031] The illustrated fluid sensing device 200 includes an aft body 212 disposed in an aft direction relative to the inner body 204 (e.g., disposed on an aft side of the inner body). As shown, the aft body 212 can include an opening 226 facing the fore side 208 and configured to receive fluid flowing toward the aft side 210. The aft body 212 can be secured to the outer body 202 by one or more aft body struts 228. The fluid sensing device 200 may include two aft body struts 228, which may be oppositely disposed (e.g., separated by 180 degrees), as illustrated. In other embodiments, a fluid sensing device may include a single aft body strut, or may include a plurality of aft body struts arranged around the aft body (e.g., separated by 30, 60, 90, 120, or 150 degrees).
[0032] As illustrated, the fluid sensing device 200 may include one or more static ports 230 disposed within a sidewall of the outer body 202. The one or more static ports 230 can be configured to sample pressure outside the direct fluid flow path in order to measure static pressure of the fluid environment (e.g., atmospheric pressure in aircraft applications). For example, one or more static ports 230 may lead to and/or be connected to a static pressure sensor (not shown).
[0033] The fluid sensing device 200 can include one or more vents 232 opening at the aft side 210 of the fluid sensing device 200. The one or more vents 232 can be configured to allow passage of fluid through and/or out of the interior space 218. As illustrated, the one or more vents 232 can be defined by a space between the aft body 212 and an inner surface of the outer body 202. In other embodiments, one or more vents may be defined by channels, grooves, and/or other conduits leading out of an interior space of a fluid sensing device (e.g., leading out through an aft side).
[0034] The one or more vents 232 may be configured to facilitate greater throughflow rates. For example, in operational environments of high/low fluid flow velocity and/or high flow angularity relative to the fluid sensing device, increased throughflow rates may beneficially reduce measurement error resulting from reduced and/or insufficient fluid capture by the fluid sensing device 200. In some embodiments, one or more vents 232 may be adjustable and/or closable. For example, in some embodiments, a user may selectively adjust and/or close one or more vents in order to alter the throughflow levels within the fluid sensing device.
[0035] FIG. 3 illustrates a cutaway view of another embodiment of a fluid sensing device 300. As shown, the fluid sensing device 300 may include an outer body 302, an inner body 304 partially disposed within an interior space 318 and secured to the outer body 302 by inner body struts 320, and an aft body 312 partially positioned within the interior space 318 and secured to the outer body 302 by aft body struts 328. The inner body 304 can be formed with a hollow interior 322. As illustrated, the hollow interior 322 can house one or more inner body sensors 334. The one or more inner body sensors 334 may include, for example, one or more of a temperature sensor (e.g., thermocouple), rate gyro, GPS unit, accelerometer, radar device, pressure sensor (e.g., static pressure sensor), magnetometer, timing clock, and/or optical sensor.
[0036] As illustrated, the inner body 304 may include a fluid permeable surface 324 disposed along at least a portion of the surface of the inner body 304. The fluid permeable surface 324 can be configured to allow passage of fluid into the hollow interior 322. For example, the fluid permeable surface 324 can allow fluid into the hollow interior 322 in order to bring fluid into contact with the one or more inner body sensors 334 disposed within the inner body 304. In some embodiments, for example, the inner body 304 and/or fluid permeable surface 324 may be configured to allow sufficient fluid contact with the one or more inner body sensors 334 while shielding the inner body sensors 334 from high fluid flows capable of damaging the inner body sensors 334 and/or causing erroneous readings by the inner body sensors 334. In some embodiments, the hollow interior 322 is configured as a stagnation zone, allowing inner body sensors 334 to make measurements requiring a stagnation environment.
[0037] In some embodiments, the fluid permeable surface 324 can be configured to allow proper functioning of one or more inner body sensors 334. For example, a fluid permeable surface 324 may be configured with one or more holes or other apertures so as to allow a radar and/or optical sensor to send and/or receive data signals, for example. Heat sinks may be installed in the inner body 304 and/or fluid permeable surface 324 to improve functionality of sensors and processors.
[0038] The illustrated embodiment may also include a conduit 336. The conduit 336 can be configured to provide passage for wiring and/or other connections between the hollow interior 322 and the outer body 302. For example, the conduit 336 can allow wiring to pass from the one or more sensors 334 to the outer body 302 and/or beyond the outer body 302. As shown, the conduit 336 can be coupled to an inner body strut 320. In such a configuration, the inner body strut 320 can provide structural support to the conduit 336.
[0039] The fluid sensing device 300 may also include one or more aft body sensors 338 disposed within the aft body 312. The one or more aft body sensors 338 may include, for example, one or more temperature sensor, rate gyro, GPS unit, accelerometer, radar device, pressure sensor, magnetometer, timing clock, and/or optical sensor. For example, in some embodiments, the fluid sensing device 300 may include a temperature sensor and a pressure sensor for measuring total temperature and total pressure, respectively.
[0040] The hollow interior 322 (or the probe's base) can include a processor 354 configured to provide real-time signal processing, analysis, and/or filtering of sensor readings. The processor 354 can be positioned, for example, within the hollow interior 322. The processor 354 can be configured to receive input from at least one sensor (e.g., from one or more inner body sensors 334 and/or one or more aft body sensors 338) within the fluid sensing device 300. Based on the received input (e.g., an input of static pressure, total temperature, and total pressure), the processor 354 may calculate one or more outputs. For example, the processor 354 may calculate a flow/flight Mach number, a fluid static temperature, entropy (including local entropy), other time-resolved data, local speed of sound, fluid static density, flow dynamic pressure, flow/flight speed, unit Reynolds number, other outputs, or combinations thereof. The illustrated embodiment can advantageously measure total temperature and total pressure locally and/or simultaneously within the same fluid sensing device 300, allowing for the calculation of local entropy.
[0041] FIG. 4 illustrates a cutaway view of an embodiment of a fluid sensing device 400 including an outer body 402 and an inner body 404. The inner body 404 can be secured to the outer body 402 by one or more inner body struts 420. As shown, the inner body 404 can project a distance out from the outer body 402 in a fore direction. The inner body 404 can be configured in size, shape, and/or surface texture to induce the Coanda effect in at least a portion of a fluid contacting the inner body 404 at an angle transverse to a longitudinal axis of the inner body 404. For example, fluid flow 442 contacting the inner body 404 at a flow angle 440 can be induced to wrap around the surface of the inner body 404 and/or be channeled into an interior space 418 of the fluid sensing device 400.
[0042] In some embodiments, the resulting fluid flow can form a swirl 444 within the interior space 418. Movement of the swirl 444 through the interior space 418 toward an aft side 410 may induce vortex ingestion of additional fluid flow 446 into the interior space 418. This can further enhance the fluid intake into the interior space 418 to further reduce or eliminate error in fluid parameter sensing (e.g., in total pressure measurements).
[0043] The inner body struts 420 can act on the swirl 444 to remove the kinetic energy of the swirl 444 and convert it to static pressure rise. For example, as a swirl 444 passes through the interior space 418 toward the aft side 410 of the fluid sensing device 400, the inner body struts 420 can break up the swirl 444. Fluid continuing past the inner body struts 420 can then enter a diminished swirl zone 448 as diminished swirl fluid 450. As shown, the diminished swirl fluid 450 can be more longitudinally oriented relative to the swirl 444, allowing passage of the diminished swirl fluid 450 into the aft body 412 and/or through one or more vents 432. In addition, the inner body 404 can include a tapered aft portion 456. The tapered aft portion 456 can be configured to allow and/or direct fluid flow more directly toward and/or into the aft body 412.
[0044] FIG. 5 illustrates an embodiment of a portion of an inner body 504 having a fore side 508 and including a surface feature 552. The surface feature 552 can be configured to generate micro-vortexes in fluid contacting and/or flowing past the inner body 504. As shown, the surface feature 552 can cover a portion of an outer surface of the inner body 504. In other embodiments, a surface feature can cover the entirety of an outer surface of an inner body, or can cover a fraction of an outer surface of an inner body, such as 10%,20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or any other percentage of the outer surface of the inner body.
[0045] The surface feature 552 can be formed as a “shark skin” texture, including a plurality of overlapping and/or interlocking segments having grooved and/or channeled surfaces, as illustrated. Other embodiments can include a surface feature including one or more grooves, patterns, ridges, posts, and/or other textures suitable for disrupting and/or generating micro-vortexes in fluid flow contacted with the surface feature. In some embodiments, the surface feature 552 may advantageously promote increased fluid flow into an interior space of a fluid sensing device through improved flow attachment to the inner body 504 and/or enhanced Coanda effect.
[0046] FIG. 6 illustrates another embodiment of a fluid sensing device 600 including an outer body 602, an inner body 604, and an aft body 612. As shown, the inner body 604 may be secured to the outer body 602 by one or more inner body struts 620. In the illustrated embodiment, a first set 658 of inner body struts 620 can be disposed at a portion of the inner body 604 closer to the fore side 608 of the fluid sensing device 600. A second set 660 of inner body struts 620 can be disposed further toward the aft side 610 of the fluid sensing device relative to the first set 658.
[0047] The fluid sensing device 600 may include a power compartment 662 disposed aft of the aft body 612. As illustrated, the power compartment 662 can be coupled to the aft body 612. For example, an outer shell forming the aft body 612 can extend as an integral piece to form the power compartment 662. In other embodiments, a power compartment may be separated from an aft body. As shown, the power compartment 662 can be coaxially aligned with the aft body 612. In other embodiments, a power compartment may be offset from an aft body. For example, a power compartment may be positioned above, below, or on a side of an aft body. Additionally, or alternatively, a power compartment and/or aft body can be offset so as not to be coaxially aligned with an outer body.
[0048] The power compartment 662 may include one or more turbines 664 optionally coupled to a generator 666. As illustrated, one or more turbines 664 may be positioned such that the turbines 664 (or at least one turbine 664) extend into one or more vents 632. For example, a turbine 664 can have a diameter (e.g., double the length of a turbine blade) that is greater than a diameter of the power compartment 662 and/or aft body 612 and less than or equal to an inner diameter of the outer body 602. The one or more turbines 664 can be configured to rotate in either direction. Some embodiments may include a counter-rotating array of turbines. For example, one or more turbines may be configured to rotate in a first direction and one or more turbines may be configured to rotate in a second direction.
[0049] Fluid flowing through the vents 632 and past the one or more turbines 664 can contact and rotate one or more turbines 664. Power generated by the rotation of the one or more turbines 664 can be converted into and/or stored as electrical energy by the generator 666 (e.g., in conjunction with an electrical energy storage system including capacitors and/or batteries). In some embodiments, the power compartment 662 may be used as an in-situ power source for powering one or more inner body sensors 634, one or more aft body sensors 638, and/or a processor 654. Such embodiments can advantageously eliminate or reduce the need for an external power source. For example, such embodiments can reduce the risk of disconnection and/or sensor failure and/or can reduce electro-magnetic interference with the one or more sensors and/or with other electrical components of the fluid sensing device.
[0050] Power generated and/or stored by the power compartment 662 can be used to power one or more thermal management elements, such as electric heating elements and/or heating tapes (e.g., graphite foil). For example, the outer body 602 and/or inner body 604 may include one or more electric heating elements and/or heating tapes for de-icing, such as in high altitude and/or cold air applications or other applications where thermal control is desirable. Other embodiments may include one or more thermal management elements fully or partly powered by an external power source.
[0051] The illustrated embodiment may also include a mixed-compression inlet 670 that may be configured, for example, to operate in supersonic flow conditions. For example, the mixed-compression inlet 670 can be configured to provide adequate operational stability at Mach numbers ranging from 2 to 4 or from 3 to 6. The mixed-compression inlet 670 can be configured to allow the flow entering the fluid sensing device 600 to remain supersonic through a portion of the fluid sensing device 600, with the terminal shock being located within the fluid sensing device 600 at a location defined by the geometry of the mixed-compression inlet 670 and/or inner body 604.
[0052] FIG. 7 illustrates another embodiment of a fluid sensing device 700 having an outer body 702, an inner body 704, an aft body 712, and a power compartment 762. As shown, the power compartment 762 can extend out of the outer body 702 beyond an aft side 710 of the outer body 702. The power compartment 762 can include one or more turbines 764 optionally coupled to a generator 766. The one or more turbines 764 can be configured to rotate in either direction. Some embodiments may include a counter-rotating array of turbines. For example, one or more turbines may be configured to rotate in a first direction and one or more turbines may be configured to rotate in a second direction.
[0053] As shown in this embodiment, the one or more turbines 764 can extend so as to reach beyond an inner diameter of the outer body 702. For example, one or more turbines 764 can have a diameter (e.g., a length double the length of a turbine blade) that is greater than or equal to the inner diameter of the outer body 702, or that is greater than or equal to an outer diameter of the outer body 702. In some embodiments, a turbine 764 may have a diameter that is from 1 to5 times, from 1.25 to 3.5 times, or from 1.5 to 2.5 times the outer diameter of the outer body 702, for example.
[0054] Fluid flowing through the vents 732 and/or flowing from outside an interior space 718 (e.g., flowing over the outer body 702) can actuate one or more turbines 764. Power generated by the rotation of the one or more turbines 764 can be converted into and/or stored as electrical energy by the generator 766 (e.g., in conjunction with an electrical energy storage system including capacitors and/or batteries). In some embodiments, the power compartment 762 may be used as an in-situ power source for powering one or more inner body sensors 734, one or more aft body sensors 738, and/or a processor 754.
[0055] FIG. 8 illustrates another embodiment of a fluid sensing device 800. The fluid sensing device 800 can be configured to be positioned on and/or into a surface 868. The surface 868 may be, for example, a portion of an aircraft or marine craft (e.g., a wing or empennage). The fluid sensing device 800 can be used, for example, for sensing and/or detecting surface effects such as local entropy, icing, asymmetries, force differentials, moment differentials, and/or unsteady nonlinear aerodynamics. As illustrated, the fluid sensing device 800 can include an outer body 802, an inner body 804, and an aft body 812. The outer body 802, inner body 804 and/or aft body 812 can be joined to the surface 868. In addition, the outer body 802 and inner body 804 may be joined by one or more inner body struts 820 and/or the outer body 802 and aft body 812 may be joined by one or more aft body struts 828.
[0056] As described above with respect to other fluid sensing device embodiments, the fluid sensing device 800 can be configured to receive fluid flow into an interior space 818 as it passes from a fore side 808 toward an aft side 810. As with other embodiments described above, the fluid sensing device 800 can include one or more inner body sensors (not shown) and/or one or more aft body sensors (not shown) for measuring one or more fluid parameters (e.g., total temperature, total pressure, static pressure).
[0057] In some embodiments, a fluid sensing device can be calibrated to improve the accuracy of sensor readings. For example, a fluid sensing device can be calibrated to improve the accuracy of a total pressure measurement by determining an amount of pressure lost due to drag associated with the inner body and adding it to the measured total pressure. For example, in embodiments where a total pressure sensor is located aft (i.e., downstream) of an inner body, the pressure measured by the pressure sensor (Pt0′) may be lower than a freestream total pressure (Pt0) due to inner body drag ((ΔPt)D). Thus, in some embodiments, a fluid sensing device can be calibrated based on the following correction:
Pt0=Pt0′+(ΔPt)D
Pt0=Pt0′+(ΔPt)D
[0058] In some embodiments, the inner body drag ((ΔPt)D) can be determined by comparing wind tunnel results of a fluid sensing device including an inner body with wind tunnel results of a device omitting an inner body. In some embodiments, inner body drag ((ΔPt)D) can be calculated according to the following formula:
(ΔPt)D=(ΔPt)D0+δ[(ΔPt)D0]θ≠0
where (ΔPt)D0 is the inner body drag at a flow angle of zero and δ[(ΔPt)D0]θ≠0 is an incremental correction at flow angles other than zero.
(ΔPt)D=(ΔPt)D0+δ[(ΔPt)D0]θ≠0
where (ΔPt)D0 is the inner body drag at a flow angle of zero and δ[(ΔPt)D0]θ≠0 is an incremental correction at flow angles other than zero.
[0059] The terms “approximately,” “about,” and “substantially” as used herein represent an amount or condition close to the stated amount or condition that still performs a desired function or achieves a desired result. For example, the terms “approximately,” “about,” and “substantially” may refer to an amount or condition that deviates by less than 10%, or by less than 5%, or by less than 1%, or by less than 0.1%, or by less than 0.01% from a stated amount or condition.
[0060] In addition, unless expressly described otherwise, all stated amounts (e.g., angle measurements, dimension measurements, etc.) are to be interpreted as being “approximately,” “about,” and/or “substantially” the stated amount, regardless of whether the terms “approximately,” “about,” and/or “substantially” are expressly stated in relation to the stated amount(s).
[0061] Further, elements described in relation to any embodiment depicted and/or described herein may be combinable with elements described in relation to any other embodiment depicted and/or described herein. For example, any element described in relation to an embodiment depicted in FIGS. 2 through 5 may be combinable with an embodiment described in relation to an embodiment depicted in FIGS. 6 through 8 .
[0062] The present disclosure may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the disclosure is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
EXAMPLES
[0063] The following Example is provided to illustrate one or more operational advantages of the fluid sensing devices of the present disclosure. The particular embodiment used in the following Example is an exemplary embodiment only, and one of skill in the art will recognize that similar beneficial results are expected across the entire scope of embodiments that fall within the present disclosure.
Example 1
[0064] A fluid sensing device according to the present disclosure was installed in parallel with a conventional Pitot tube in a wind tunnel measuring approximately 3 feet high, 4 feet wide, and 6 feet long. The fluid sensing device and the Pitot tube were installed on a tuntable that was turned in increments of 5 degrees with respect to the flow direction in the test section. The fluid sensing device included an inner body having an ellipsoid of revolution contour and an L/D ratio of 1.0. The ratio of the outer diameter of the outer body to the diameter of the inner body was 2.0. The outer body included a contoured lip with an elliptic shape having a semi-major to minor axis equal to 2. The fluid sensing device was calibrated to correct for inner body drag. Comparison tests were conducted at wind speeds of 27.5 m/s, 30.5 m/s, and 35 m/s, and the results are shown in FIGS. 9, 10, and 11 , respectively.
Claims
What is claimed is:
1. A fluid sensing device, comprising:
an outer body having a fore side, an aft side, and an interior space, the outer body including a fluid inlet disposed at the fore side;
an inner body extending at least partially out of the fluid inlet of the outer body along a longitudinal axis; and
an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body including an opening oriented toward the fore side of the outer body, and the aft body housing one or more aft body sensors;
wherein the inner body is configured to induce the Coanda effect in at least a portion of a fluid contacting the inner body at an angle transverse to a longitudinal axis of the inner body.
2. The fluid sensing device of claim 1, wherein the inner body includes a hollow interior housing one or more inner body sensors.
3. The fluid sensing device of claim 2, wherein the one or more inner body sensors include one or more temperature sensor, rate gyro, GPS unit, accelerometer, radar device, pressure sensor, magnetometer, timing clock, or optical sensor.
4. The fluid sensing device of claim 2, wherein the hollow interior is configured such that fluid within the hollow interior is in a stagnation state.
5. The fluid sensing device of claim 2, further comprising a processor disposed within the hollow interior or the external mounting base, the processor configured to provide real-time processing of sensor readings by receiving input from at least one sensor and, based on the received input, calculating one or more outputs.
6. The fluid sensing device of claim 1, wherein the inner body includes a fluid permeable surface covering at least a portion of the inner body.
7. The fluid sensing device of claim 1, further comprising a contoured lip configured to widen the angularity of a fluid capture dome.
8. The fluid sensing device of claim 1, further comprising one or more inner body struts configured to secure the inner body to the outer body and one or more aft body struts configured to secure the aft body to the outer body.
9. The fluid sensing device of claim 8, further comprising a conduit coupled to the inner body strut configured to provide passage between a hollow interior of the inner body and the outer body.
10. The fluid sensing device of claim 1, further comprising one or more static ports disposed within a sidewall of the outer body.
11. The fluid sensing device of claim 1, further comprising one or more vents defined by a space between the aft body and an inner surface of the outer body.
12. The fluid sensing device of claim 1, wherein the one or more aft body sensors include one or more temperature sensor, rate gyro, GPS unit, accelerometer, radar device, pressure sensor, magnetometer, timing clock, or optical sensor.
13. The fluid sensing device of claim 1, wherein the inner body includes a surface feature configured to generate micro-vortexes in a fluid contacting the inner body.
14. The fluid sensing device of claim 13, wherein the surface feature is formed as a shark skin texture.
15. The fluid sensing device of claim 1, further comprising a power compartment disposed aft of the inner body, the power compartment including one or more turbines configured to generate power upon contact with a fluid flowing past the one or more turbines.
16. The fluid sensing device of claim 15, wherein the one or more turbines are disposed within the interior space of the outer body, the one or more turbines having a diameter that is less than or equal to an inner diameter of the outer body.
17. The fluid sensing device of claim 15, wherein the one or more turbines are disposed aft of the outer body, the one or more turbines having a diameter that is greater than or equal to an outer diameter of the outer body.
18. The fluid sensing device of claim 15, wherein the one or more turbines are configured as a counter-rotating array.
19. The fluid sensing device of claim 1, further comprising one or more heating elements and an anti-icing system.
20. An airflow sensor for measuring airflow on an aircraft, the airflow sensor comprising:
an outer body having a fore side, an aft side, and an interior space, the outer body including a fluid inlet disposed at the fore side;
an inner body extending at least partially out of the fluid inlet of the outer body along a longitudinal axis, the inner body including a hollow interior configured such that fluid within the hollow interior is in a stagnation state, the hollow interior housing one or more inner body sensors, the inner body including a fluid permeable surface covering at least a portion of the inner body and the hollow interior and configured to allow passage of a fluid from the interior space into the hollow interior; and
an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body including an opening oriented toward the fore side of the outer body, and the aft body housing one or more aft body sensors;
wherein the inner body is configured to induce the Coanda effect in at least a portion of a fluid contacting the inner body at an angle transverse to a longitudinal axis of the inner body.
21. A method of sensing a fluid parameter of a flowing fluid, the method comprising:
positioning a fluid sensing device within a flowing fluid, the fluid sensing device including:
an outer body having a fore side, an aft side, and an interior space, the outer body including a fluid inlet disposed at the fore side;
an inner body extending at least partially out of the fluid inlet of the outer body along a longitudinal axis; and
an aft body disposed at least partially within the outer body at a location aft of the inner body, the aft body including an opening oriented toward the fore side of the outer body, and the aft body housing one or more aft body sensors;
wherein the inner body is configured to induce the Coanda effect in at least a portion of a fluid contacting the inner body at an angle transverse to a longitudinal axis of the inner body; and
receiving a reading from the one or more aft body sensors.
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