CN112067246B - Asymmetric convex boundary layer pressure measurement framed bent - Google Patents
Asymmetric convex boundary layer pressure measurement framed bent Download PDFInfo
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- CN112067246B CN112067246B CN202010996767.XA CN202010996767A CN112067246B CN 112067246 B CN112067246 B CN 112067246B CN 202010996767 A CN202010996767 A CN 202010996767A CN 112067246 B CN112067246 B CN 112067246B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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Abstract
The invention discloses an asymmetric arc boundary layer pressure measuring bent, belongs to the field of experimental aerodynamics, and aims to solve the problems that at present, a straight comb-shaped bent is few in measuring points, and measuring results are influenced by probe interference. The device comprises a mounting seat, an arc section bracket, a straight section bracket and a pressure measuring probe; the section of the arc section support along the windward direction is arc-shaped, the section of the arc section support along the vertical direction is a quarter arc, and the front end of the arc section support along the windward direction is wedge-shaped; the section of the straight section support along the windward direction is in a straight shape, and the front end of the straight section support along the windward direction is in a wedge shape; the mounting seat is provided with a fixing hole, and two ends of the arc section support are respectively connected with the mounting seat and the bottom end of the straight section support. This application can be on accurate, reliable basis, and boundary layer skin in the accurate near wall thin layer region of obtaining holds in the palm pressure distribution, can also effectively reduce the interference influence between the probe, improves measuring result's accuracy.
Description
Technical Field
The application relates to the field of experimental aerodynamics, in particular to the field of experimental dynamics measuring equipment, and specifically relates to an asymmetric arc boundary layer pressure measuring bent. The application discloses pressure measurement framed bent is asymmetric convex boundary layer pressure measurement framed bent that can be used to thin boundary layer flow characteristic measurement, and it can effectively reduce the interference influence between the probe, improves measuring result's accuracy.
Background
The thickness of the boundary layer is one of the key contents of the calibration of the flow field of the wind tunnel test section, which not only affects the uniformity of the flow field of the model area, but also has great influence on the interference correction such as airflow blockage, flow field distortion and the like, and the accurate measurement of the flow speed and pressure distribution in the boundary layer is a necessary condition for improving the accuracy of test data.
The velocity distribution in the boundary layer is hyperbolic, and the total pressure and the flow velocity of the airflow gradually increase along with the increase of the distance from the wall plate; wherein the most intense region of variation is a thin layer 1/5 to 1/3 times the thickness of the boundary layer from the wall surface, and in this region the gas flow velocity rapidly increases from 0 at the wall surface to 80% to 95% of the velocity of the external flow field. Therefore, the thin layer in the near-wall region is difficult and critical to achieve accurate measurement of flow characteristics within the boundary layer.
At present, the flow characteristics of a boundary layer in a conventional wind tunnel are measured by a linear comb-shaped bent frame to obtain the variation of the Pitot pressure at the designated position of a model area along with the wall surface distance, and then data such as the thickness of the boundary layer are obtained through data fitting. The traditional measuring method can accurately measure the velocity distribution of the upper velocity change relaxation area of the similar boundary layer; however, for the bottom layer of the boundary layer and the thin layer with a smaller distance from the wall plate, on one hand, the straight comb-shaped bent frame has fewer pressure measuring points, which is not beneficial to data fitting of a flow field with rapidly changing speed, and on the other hand, the distance between the measuring points is smaller, the measuring result is influenced by mutual interference of probes, and the measuring accuracy is reduced. Therefore, the traditional measuring instrument is optimized and updated, the accuracy of measuring the flow characteristics of the boundary layer of the cavity wall is improved, and the method has important significance for guiding the flow field calibration and test result correction and analysis of equipment.
Disclosure of Invention
The invention aims to: aiming at the current situation that the number of the measuring points of the existing linear comb-shaped bent frame is small and the measuring result is influenced by the interference of the probes, the asymmetrical arc boundary layer pressure measuring bent frame is provided, which can accurately obtain the distribution of the pitot pressure of the boundary layer in the thin layer area close to the wall surface on the basis of accuracy and reliability, effectively reduce the interference influence among the probes and improve the accuracy of the measuring result.
In order to achieve the purpose, the following technical scheme is adopted in the application:
an asymmetric arc boundary layer pressure measuring bent comprises a mounting seat, an arc section support, a straight section support and a pressure measuring probe, wherein the mounting seat is used for being connected with a test section wall plate;
the section of the arc section support along the windward direction is arc-shaped, the section of the arc section support along the vertical direction is a quarter arc, the front end of the arc section support along the windward direction is wedge-shaped, and the wedge-shaped front end of the arc section support can reduce the blocking influence on the incoming flow;
the section of the straight section support along the windward direction is in a straight shape, the front end of the straight section support along the windward direction is in a wedge shape, and the wedge-shaped front end of the straight section support can reduce the blocking influence on the incoming flow;
the mounting seat is provided with a fixing hole and can be connected with a test section wall plate through a screw or the matching of the screw and the fixing hole, the mounting seat is connected with one end of the arc section support and can provide support for the arc section support, and the other end of the arc section support is connected with the bottom end of the straight section support;
the probe mounting holes in the arc section support are respectively arranged at the front end of the arc section support along the windward direction and the rear end of the arc section support along the windward direction, a plurality of probes located at the front end of the arc section support along the windward direction are mounted in a Kong Jiwei first mounting hole group, a plurality of probes located at the rear end of the arc section support along the windward direction are mounted in a Kong Jiwei second mounting hole group, the probe mounting holes in the first mounting hole group are arranged on the arc section support along the mounting seat in the direction towards the straight section support in an equal arc length mode, the probe mounting holes in the second mounting hole group are arranged on the arc section support along the mounting seat in the direction towards the straight section support in an equal arc length mode, and the first mounting hole group and the second mounting hole group are arranged asymmetrically relative to the arc section support;
the straight section support is provided with probe mounting holes, the probe mounting holes on the straight section support are respectively arranged at the front end of the straight section support along the windward direction and at the rear end of the straight section support along the windward direction, a plurality of probe mounting holes Kong Jiwei positioned at the front end of the straight section support along the windward direction are arranged in a third mounting hole group, a plurality of probe mounting holes Kong Jiwei positioned at the rear end of the straight section support along the windward direction are arranged in a fourth mounting hole group, the probe mounting holes in the third mounting hole group are equidistantly arranged on the straight section support, the probe mounting holes in the fourth mounting hole group are equidistantly arranged on the straight section support, the vertical distance between two adjacent probe mounting holes in the third mounting hole group is the same as the vertical distance between two probe mounting holes at the top end of the first mounting hole group and the straight section support, and the vertical distance between two adjacent probe mounting holes in the fourth mounting hole group and two probe mounting holes at the top end of the second mounting hole group and the straight section support;
the pressure measuring probe is arranged in the probe mounting hole.
The mounting seat is flat, and the front end of the mounting seat in the windward direction is chamfered.
The section of the mounting seat along the windward direction is in a right trapezoid shape, one side of the mounting seat, which is connected with the test section wallboard, is a lower bottom of the right trapezoid shape, one side of the mounting seat, which is parallel to the lower bottom, is an upper bottom of the mounting seat, and the length of the upper bottom of the mounting seat is smaller than that of the lower bottom of the mounting seat;
the side edge facing the windward direction on the mounting seat is obliquely arranged relative to the plane where the wall plate of the test section is located.
The connecting part of the side edge facing the windward direction on the mounting seat and the upper bottom of the mounting seat adopts a chamfer design.
The side face of the mounting seat is fixedly connected with the arc section support, and the mounting seat is connected with the test section wallboard through a countersunk screw.
The fixing hole is a countersunk screw hole for mounting a countersunk screw.
And taking the upper bottom of the mounting seat as a position measurement reference.
The pressure measuring probe is made of a seamless steel tube, and resin is filled between the pressure measuring probe and the probe mounting hole.
The distance between the head of the pressure measuring probe and the arc section support or the straight section support is 40mm.
And the center distance between two adjacent probe mounting holes in one or two of the first mounting hole group and the first mounting hole group is 2 times of the outer diameter of the pressure measuring probe.
The wedge-shaped front end angle of the arc-section support and the wedge-shaped front end angle of the straight-section support are respectively 15 degrees, and the wedge-shaped front end of the arc-section support and the wedge-shaped front end of the straight-section support are respectively in asymmetric shapes.
To the foregoing problem, the present application provides an asymmetric convex boundary layer pressure measurement bent. The inventor considers that the boundary layer characteristics of the wall plate are generally measured in the state of an air tunnel without a model, the flow stream area outside the boundary layer can be regarded as direct flow, and the air flow speed, the flow direction and the like only slightly change along the axial position of a test section, namely the flow is uniform in the spanwise direction and the vertical direction of the wall plate of the test section. Therefore, the measuring points in the near-wall area are designed to be arc-shaped in the span direction, the front ends of the measuring points are in an asymmetric form, on one hand, the number of the measuring points is increased, the starting point is closer to the wall plate, on the other hand, the interference influence among the measuring points is reduced, and the accuracy of the measuring result is improved.
In the application, a plurality of probe mounting holes are uniformly distributed on the arc section bracket along the arc section according to the number of measuring points; meanwhile, the straight section support is in a shape like a Chinese character 'yi', the structural form is similar to that of the traditional 'yi' -shaped comb-shaped bent frame, the bottom end of the straight section support is fixedly connected with the top end of the circular arc section support, a plurality of probe mounting holes are distributed on the straight section support at equal intervals, and the interval is the same as the vertical interval of the nearest two points on the top end of the circular arc section. Meanwhile, the probe mounting holes on the arc-section support and the straight-section support are asymmetrically arranged relative to the front end face and the rear end face of the bent, and the measuring points are closer to the surface of the test area, so that the accuracy of the measuring result of the near-wall area is improved. Furthermore, the pressure measuring probes are installed on the bent frame through the probe installation holes of the arc section support and the straight section support and filled with resin, and the distance between the probe heads and the front end of the support is 40mm, so that the influence of the bent frame on the probe measuring result is reduced. The utility model provides an arc section support, be provided with the probe mounting hole on the straight section support respectively, the equal arc length setting of direction of probe mounting hole along the mount pad towards the straight section support on the arc section support, the probe mounting hole equidistance on the straight section support sets up on the straight section support, interval between two adjacent probe mounting holes on the straight section support is the same with the vertical interval of two nearest points in arc section support top, the probe mounting hole asymmetric arrangement of arc section support both sides, the pressure measurement probe sets up in the probe mounting hole.
In order to achieve a better technical effect, the pressure measuring probe is preferably a seamless steel tube with the outer diameter of 1.0 mm; the center distance of the probe mounting holes on the circular arc support is 2 times of the outer diameter of the probe, namely 2.0mm; the wedge angle of the front ends of the arc-section support and the straight-section support facing the airflow is 15 degrees, and the arc-section support and the straight-section support are in asymmetric shapes so as to reduce the interference influence on the measurement result of the probe.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) The pressure measuring bent frame for the asymmetric arc boundary layer comprises a mounting seat, an arc section support, a straight section support and a pressure measuring probe, and is simple in overall structure, easy to implement and high in safety;
(2) The asymmetric arc boundary layer pressure measuring bent frame can greatly increase the number of pressure measuring probes in a thin layer of a near-wall area, effectively reduce interference influence among the probes and improve the speed of the thin boundary layer and the accuracy of pressure distribution measurement;
(3) According to the asymmetric arc boundary layer pressure measuring bent frame, the side mounting seats are mounted on the test section wall plate, the probe measuring points are asymmetrically arranged relative to the support, the normal distance between the first measuring point and the wall surface is reduced while the structural safety is guaranteed, the position translation of the mounting seats and the bent frame measuring points greatly reduces the influence of the mounting seats on the measuring result, and the accuracy of the measuring result is improved;
(4) The method is favorable for accurately obtaining the boundary layer pitot pressure distribution in the near-wall thin layer area on the basis of accuracy and reliability;
(5) The method and the device have the advantages of ingenious design, reasonable design and higher practical value, are favorable for improving the measurement precision of related results, and provide more reliable data for corresponding tests.
Drawings
FIG. 1 is a schematic view of the whole structure of a pressure measuring bent of a circular arc boundary layer.
FIG. 2 is a schematic size diagram of a pressure measuring bent of a circular arc boundary layer.
The labels in the figure are: 1 is the mount pad, 2 is the fixed orifices, and 3 are the circular arc section support, and 4 are straight section supports, and 5 are pressure probe, and 8 are asymmetric wedge outer fringe side, and 9 are asymmetric wedge front end, and 10 are asymmetric wedge inner edge.
Detailed Description
In addition to the foregoing, there are other objects, features and advantages of the present application. The present application will now be described in further detail with reference to the accompanying drawings.
In order to make the objects, solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and examples, but the present invention can be implemented in many different ways as defined and covered by the claims. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
The embodiment provides an asymmetric arc boundary layer pressure measuring bent frame applied to a 0.6-meter transonic wind tunnel, the height of the asymmetric arc boundary layer pressure measuring bent frame is 100mm, the spanwise length of the asymmetric arc boundary layer pressure measuring bent frame is 50mm, and the requirement for boundary layer flow characteristic measurement during sub-span, span and supersonic running is met.
The structure of the asymmetric arc boundary layer pressure measurement bent frame of the embodiment is shown in fig. 1 and fig. 2, and the whole bent frame comprises four main parts, namely a mounting seat, an arc section support, a straight section support and a pressure measurement probe.
As shown in fig. 1, the mounting seat is flat, and is provided with a fixing hole, and the front end of the mounting seat in the windward direction is chamfered. Preferably, the fixing hole is a countersunk screw hole for mounting a countersunk screw. In the embodiment, the mounting seat is used for fixing the pressure measuring bent frame at the test position of the test section wall plate; more specifically, the mounting seat is connected with the wall plate of the test section through the matching of the countersunk head screw and the countersunk head screw hole. Furthermore, the section of the mounting seat along the windward direction is in a right trapezoid shape, one side of the mounting seat, which is connected with the test section wallboard, is a lower bottom of the right trapezoid shape, one side of the mounting seat, which is parallel to the lower bottom, is an upper bottom of the mounting seat, and the length of the upper bottom of the mounting seat is smaller than that of the lower bottom of the mounting seat; the side edge facing the windward direction on the mounting seat is obliquely arranged relative to the plane where the test section wall plate is located.
In this embodiment, the arc section support is a quarter circle (that is, the section of the arc section support along the windward direction is circular-arc and the section of the arc section support along the vertical direction is a quarter arc), and two ends of the arc section support are respectively and fixedly connected with the mount pad and the straight section support. The front end of the arc section support is in an asymmetric wedge shape, the outer edge radius is 50mm, the front end wedge radius is 48.5mm, the inner edge radius is 45mm, the thickness is 5mm, 39 probe mounting holes are formed in the front end wedge, the distance between the hole centers along the arc direction is 2.1mm, and the distance between the hole centers of the probe mounting holes and the two end faces of the arc section support is 3.5mm and 1.5mm respectively. Wherein, the coordinates of the mounting holes are as follows:
in the above formula, subscriptiThe measurement point serial numbers are 1,2, … and 39;Rthe wedge radius of the front end of the arc section bracket is 48.5mm;θthe arc angle is a fan angle corresponding to a 2.1mm arc, and the magnitude is 0.041 radian;X 0 、Y 0 respectively setting the extension direction and normal direction coordinates of the center of the first probe mounting hole of the arc section bracket, wherein the measurement values are 0mm and 1mm respectively;X i 、Y i are respectively the firstiThe spanwise and normal coordinates of the center of each probe mounting hole.
In this embodiment, the straight-section support is in a shape of a straight line, the bottom end of the straight-section support is fixedly connected with the arc-section support, and the front end of the straight-section support is in an asymmetric wedge shape (the front end of the asymmetric wedge shape of the straight-section support corresponds to the front end of the asymmetric wedge shape of the arc-section support). The straight section support is provided with a plurality of probe mounting holes, the distance between the centers of the probe mounting holes on the straight section support is the same as the distance between the two holes at the top of the circular arc section support, and the distances between the centers of the probe mounting holes on the straight section support and the two end surfaces of the straight section support are respectively 3.5mm and 1.5mm (in other words, the distances between the centers of the probe mounting holes on the straight section support and the two side surfaces of the straight section support are respectively 3.5mm and 1.5mm except the front end surface and the rear end surface of the straight section support along the windward direction).
In this embodiment, the pressure probe sets up in the probe mounting hole, and 1.0mm seamless steel pipe is chooseed for use to the external diameter of pressure probe, and the pressure probe passes through the probe mounting hole of circular arc section support and straight section support and installs on the framed bent to utilize resin to fill, probe mounting hole head is apart from framed bent front end 40mm, in order to reduce the influence of framed bent to probe measuring result. In this embodiment, the probe mounting holes on the bent are asymmetrically arranged along the front end and the rear end of the windward direction. Furthermore, the wedge-shaped front end angle of the circular arc section support and the wedge-shaped front end angle of the straight section support are respectively 15 degrees, and the wedge-shaped front end of the circular arc section support and the wedge-shaped front end of the straight section support are respectively in asymmetric shapes.
In this embodiment, the working process of the asymmetric arc boundary layer pressure measurement bent frame is as follows:
(1) Mounting the pressure measuring bent frame on a test section wall plate by using two countersunk head screw holes, and measuring the distance from the front end surface and the rear end surface of the mounting seat to the side wall of the test section by using a vernier caliper to ensure that the difference is less than 0.04mm;
(2) The spanwise and normal coordinates of each measurement point are calculated according to the dimensions of the bent, and in this example, the x-y coordinates of the center point of each probe on the arc segment support are shown in table 1.
(3) And (4) collecting the pitot pressure of each measuring point after the wind tunnel operation flow field is stable, and calculating the total pressure and the velocity distribution in the boundary layer according to the normal coordinate of the measuring points so as to obtain the thickness of the boundary layer.
TABLE 1 spanwise and Normal coordinate information of each measurement Point
Actual test results show that the circular arc-shaped pressure measurement bent frame can greatly increase the number of pressure measurement probes in the thin layer of the near-wall area, effectively reduce interference influence among the probes, and improve the speed of the thin boundary layer and the accuracy of pressure distribution measurement. Meanwhile, the arc-shaped pressure measuring bent frame is installed on a test section wall plate through the side installation seat, the probe measuring points are asymmetrically arranged relative to the support, the normal distance between the first measuring point and the wall surface is reduced while the structural safety is guaranteed, the installation seat and the bent measuring point are horizontally moved, the influence of the installation seat on the measuring result is greatly reduced, and the accuracy of the measuring result is favorably improved.
The above description is only one embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The asymmetric arc boundary layer pressure measuring bent frame is characterized by comprising a mounting seat, an arc section support, a straight section support and a pressure measuring probe, wherein the mounting seat is used for being connected with a test section wall plate;
the section of the arc section support along the windward direction is arc-shaped, the section of the arc section support along the vertical direction is a quarter arc, the front end of the arc section support along the windward direction is wedge-shaped, and the wedge-shaped front end of the arc section support can reduce the blocking influence on the incoming flow;
the section of the straight section support along the windward direction is in a straight shape, the front end of the straight section support along the windward direction is in a wedge shape, and the wedge-shaped front end of the straight section support can reduce the blocking influence on the incoming flow;
the mounting seat is provided with a fixing hole and can be connected with a test section wall plate through a screw or the matching of the screw and the fixing hole, the mounting seat is connected with one end of the arc section support and can provide support for the arc section support, and the other end of the arc section support is connected with the bottom end of the straight section support;
the probe mounting holes in the arc section support are respectively arranged at the front end of the arc section support along the windward direction and the rear end of the arc section support along the windward direction, a plurality of probes located at the front end of the arc section support along the windward direction are mounted in a Kong Jiwei first mounting hole group, a plurality of probes located at the rear end of the arc section support along the windward direction are mounted in a Kong Jiwei second mounting hole group, the probe mounting holes in the first mounting hole group are arranged on the arc section support along the mounting seat in the direction towards the straight section support in an equal arc length mode, the probe mounting holes in the second mounting hole group are arranged on the arc section support along the mounting seat in the direction towards the straight section support in an equal arc length mode, and the first mounting hole group and the second mounting hole group are arranged asymmetrically relative to the arc section support;
the straight section support is provided with probe mounting holes, the probe mounting holes on the straight section support are respectively arranged at the front end of the straight section support along the windward direction and at the rear end of the straight section support along the windward direction, a plurality of probe mounting holes Kong Jiwei positioned at the front end of the straight section support along the windward direction are arranged in a third mounting hole group, a plurality of probe mounting holes Kong Jiwei positioned at the rear end of the straight section support along the windward direction are arranged in a fourth mounting hole group, the probe mounting holes in the third mounting hole group are equidistantly arranged on the straight section support, the probe mounting holes in the fourth mounting hole group are equidistantly arranged on the straight section support, the vertical distance between two adjacent probe mounting holes in the third mounting hole group is the same as the vertical distance between two probe mounting holes at the top end of the first mounting hole group and the straight section support, and the vertical distance between two adjacent probe mounting holes in the fourth mounting hole group and two probe mounting holes at the top end of the second mounting hole group and the straight section support;
the pressure measuring probe is arranged in the probe mounting hole;
the distance between the centers of the probe mounting holes on the straight section support is the same as the distance between two holes at the top of the circular arc section support;
the probe mounting holes on the arc-section support and the straight-section support are asymmetrically arranged relative to the front end face and the rear end face of the bent, and the measuring points are closer to the surface of the test area;
the coordinates of the probe mounting holes on the arc section support are as follows:
X i ＝R·sin[(i-1)·θ]+X 0 ，
Y i ＝R-R·cos[(i-1)·θ]+Y 0 ；
wherein, subscript i is the measuring point serial number; r is the wedge radius of the front end of the arc section bracket; theta is a fan angle corresponding to the circular arc; x 0 、Y 0 Respectively representing the unfolding coordinates and the normal coordinates of the center of the first probe mounting hole of the arc section bracket; x i 、Y i Respectively representing the unfolding coordinates and the normal coordinates of the center of the ith probe mounting hole;
the pressure measuring probe is made of a seamless steel tube, and resin is filled between the pressure measuring probe and the probe mounting hole.
2. The asymmetric circular arc boundary layer pressure measuring bent according to claim 1, wherein the mounting seat is flat, and the front end of the mounting seat in the windward direction is chamfered.
3. The asymmetric arc boundary layer pressure measuring bent frame according to claim 2, wherein the section of the mounting seat along the windward direction is in a right trapezoid shape, one side of the mounting seat connected with the test section wall plate is the lower bottom of the right trapezoid shape, one side of the mounting seat parallel to the lower bottom is the upper bottom of the mounting seat, and the length of the upper bottom of the mounting seat is smaller than that of the lower bottom of the mounting seat;
the side edge facing the windward direction on the mounting seat is obliquely arranged relative to the plane where the wall plate of the test section is located.
4. The asymmetric circular arc boundary layer pressure measuring bent according to claim 2, wherein the connection between the side of the mounting base facing the windward direction and the upper bottom of the mounting base is designed to be a chamfer.
5. The asymmetric circular arc boundary layer pressure measuring bent frame according to claim 1, wherein the side face of the mounting seat is fixedly connected with a circular arc section support, and the mounting seat is connected with the test section wall plate through a countersunk head screw.
6. The asymmetric circular arc boundary layer pressure measurement bent according to claim 5, wherein the fixing hole is a countersunk screw hole for mounting a countersunk screw.
7. The asymmetric circular arc boundary layer pressure measurement bent according to claim 1, wherein the distance between the head of the pressure measurement probe and the circular arc section support or the straight section support is 40mm.
8. The asymmetric circular arc boundary layer pressure measurement bent frame according to claim 1, wherein the distance between centers of two adjacent probe installation holes in one or two of the first installation hole group and the second installation hole group is 2 times of the outer diameter of the pressure measurement probe.
9. The asymmetric circular arc boundary layer pressure measuring bent according to any one of claims 1 to 8, wherein the angle of the wedge-shaped front end of the circular arc section support and the angle of the wedge-shaped front end of the straight section support are respectively 15 degrees, and the wedge-shaped front ends of the circular arc section support and the straight section support respectively adopt asymmetric shapes.
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| CA2966743A1 (en) * | 2016-07-15 | 2018-01-15 | Rosemount Aerospace Inc. | Air data probe with turbulence-producing geometry |
| CN106483330A (en) * | 2016-12-07 | 2017-03-08 | 中南大学 | One kind is based on reflective silk thread attitude angle visual identity two-D wind speed wind direction method of testing |
| CN107084830A (en) * | 2017-07-04 | 2017-08-22 | 西北大学 | A kind of analogy method of the confused wind of atmospheric boundary layer wind tunnel |
| CN108593251A (en) * | 2018-07-03 | 2018-09-28 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of probe rides and movable measuring device measuring the flowing of cell wall near-wall region |
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