Multi-point flow field pressure measuring jig

Abstract

The invention discloses a multi-point flow field pressure measurement jig, relates to the technical field of fluid pressure measurement, and aims to solve the technical problem of low measurement efficiency of a current fluid pressure test mode. The multi-point flow field pressure measuring jig comprises a support, a plurality of air guide pipes and a plurality of testing elements, a plurality of air gathering pipes are arranged on the support at intervals, and first air inlet ends and first air outlet ends of the air gathering pipes are open ends; a second air inlet end and a second air outlet end of the air guide pipe are open ends; the second air inlet end of each air guide pipe is arranged in one air gathering pipe and faces the first air inlet end of the air gathering pipe, and each test element is arranged at the second air outlet end of one air guide pipe. According to the multi-point flow field pressure measurement jig provided by the invention, the plurality of air gathering pipes are respectively supported at a plurality of detection positions through the bracket, fluid pressure data at a plurality of positions can be obtained at one time, and the measurement efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fluid pressure measurement, and in particular to a multi-point flow field pressure measurement fixture. Background Art

[0002] In the whole vehicle wind resistance test (measuring the whole vehicle drag coefficient Cd value), it is necessary to drive a model vehicle in a wind tunnel test room, rely on the wind tunnel's giant fan to provide power to create airflow, and use a belt to drive the tires to rotate, so that the vehicle can be tested under fixed conditions. The resistance of the airflow to the vehicle.

[0003] When analyzing the flow field around a vehicle, in addition to visually observing the flow field using a smoke generator, it is often necessary to measure parameters such as pressure and velocity in a specific area of ​​the flow field to analyze drag coefficient reduction. The flow field at the front side of the vehicle significantly affects the drag coefficient under different front bumper shapes and wheel styling. Therefore, during drag tests, it is necessary to measure the pressure of the flow field around the front tires to analyze the flow state of the front airflow.

[0004] In conventional wind resistance testing, the pressure in the flow field around the front tire is measured using a single-point pressure measuring valve provided by the wind tunnel laboratory for scanning measurements. During measurement, a mobile measuring frame fixed to the top of the wind tunnel is positioned at the measurement point. After the measurement is completed, it is moved to another point for sequential scanning measurements, resulting in low measurement efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a multi-point flow field pressure measurement fixture, aiming to solve the technical problem of low measurement efficiency in current fluid pressure testing methods.

[0006] In a first aspect of the present application, a multi-point flow field pressure measurement fixture is provided, the multi-point flow field pressure measurement fixture comprising:

[0007] A bracket, wherein a plurality of air collecting pipes are arranged at intervals on the bracket, wherein the center lines of the air collecting pipes are arranged in parallel, and the air collecting pipes include a first air inlet end and a first air outlet end that are arranged opposite to each other, and the first air inlet end and the first air outlet end are both open ends;

[0008] Multiple air ducts and multiple test elements, the air ducts include a second air inlet end and a second air outlet end relatively arranged, the second air inlet end and the second air outlet end are both open ends; the second air inlet end of each of the air ducts is arranged inside an air collecting duct and facing the first air inlet end of the air collecting duct, each of the test elements is arranged at the second air outlet end of an air duct, and the test element is used to measure fluid pressure data.

[0009] In the above scheme, multiple air collecting tubes are supported at multiple detection positions by brackets. The wind to be measured enters the corresponding test element through the air collecting tubes and air guide tubes for fluid pressure data detection. The fluid pressure data at multiple positions can be obtained at one time, thereby increasing measurement efficiency.

[0010] Optionally, the air guide duct is a rigid tube, and each of the air collecting ducts is connected to the bracket through the corresponding air guide duct.

[0011] In the above solution, the air collecting duct and the bracket are connected by a rigid air guide duct, which can reduce the installation of other supporting components, simplify the structure, reduce the overall weight of the bracket, and reduce the impact on the surrounding flow field airflow, thereby improving measurement accuracy.

[0012] Optionally, a mounting hole is provided on the air collecting duct, the air guide duct passes through the mounting hole, and the center line of the air collecting duct is collinear with the center line of the air guide duct inside the air collecting duct.

[0013] In the above scheme, the installation and positioning of the air collecting duct and the air guide duct are facilitated, and the center line of the air collecting duct and the center line of the air guide duct inside the air collecting duct are arranged collinearly, which facilitates the wind to be measured to enter the air guide duct through the air collecting duct, thereby increasing the accuracy of the measurement results.

[0014] Optionally, the bracket includes a base and a first support frame arranged on the base, and the plurality of air collecting ducts are arranged on the first support frame, and the plurality of air collecting ducts are arranged at intervals along the length direction of the first support frame.

[0015] In the above solution, it is convenient to install multiple air collecting pipes through the first support frame, and ensure that the distribution of the air collecting pipes meets the measurement requirements, and the base can ensure the stability of the support structure.

[0016] Optionally, there are multiple first support frames, and the length directions of the multiple first support frames are parallel.

[0017] In the above solution, by increasing the number of first support frames and thus increasing the number of arranged air collecting pipes, the multi-point flow field pressure measurement fixture can measure fluid pressure data at multiple positions at one time, thereby increasing measurement efficiency.

[0018] Optionally, the first air inlet ends of the plurality of air collecting ducts are located in the same plane.

[0019] In the above solution, it is convenient to obtain the fluid pressure data of the wind to be measured on the same interface.

[0020] Optionally, the bracket further includes a second support frame, one end of the second support frame is connected to the base, and each of the first support frames is connected to the second support frame.

[0021] In the above solution, the first support frame is connected to the bracket via the second support frame, thereby ensuring the installation and positioning effect of the first support frame.

[0022] Optionally, the first support frame includes a first section and a second section, the first section and the second section are arranged along the length direction of the first support frame, and at least one air collecting duct is provided on the first section and the second section; the first section and the second section are connected by an adjustment structure, and the adjustment structure is used to adjust the distance between the first section and the second section along the length direction of the first support frame.

[0023] In the above scheme, the distance between the first section and the second section along the length direction of the first support frame is adjusted by adjusting the structure, thereby changing the distance between the two adjacent air collecting ducts in the length direction of the first support frame to meet the distance requirements between the two adjacent air collecting ducts in different test scenarios and increase the scope of application.

[0024] Optionally, the distance between the second air inlet end of the air guide duct and the corresponding first air inlet end of the air collecting duct is 8-12 mm.

[0025] In the above solution, the wind to be measured that enters the air collecting duct enters the air guide duct smoothly, thereby ensuring the accuracy of the measurement result.

[0026] Optionally, the distance between two adjacent air collecting pipes in the horizontal direction is 90-110 mm;

[0027] And / or, the vertical distance between two adjacent air collecting ducts is 90-110 mm.

[0028] The above solution can meet the multi-point testing requirements of the flow field pressure next to the front wheels of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 A schematic structural diagram of a multi-point flow field pressure measurement fixture provided in an embodiment of the present application;

[0031] Figure 2 A schematic structural diagram of a method for connecting an air collecting duct and an air guiding duct provided in an embodiment of the present application;

[0032] Figure 3 A schematic structural diagram of a first support frame provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 1. Bracket; 11. Base; 12. First support frame; 121. First section; 122. Second section; 13. Second support frame; 14. Horizontal brace; 15. Diagonal brace; 16. Support rod; 2. Air collecting duct; 21. First air inlet; 22. First air outlet; 3. Air guide duct; 31. Second air inlet; 32. Second air outlet. DETAILED DESCRIPTION

[0035] In the embodiments of the present application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of the features.

[0036] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0037] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0038] In the embodiments of the present application, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement being discussed and the errors associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0039] In the related art, during the wind resistance test, the pressure of the flow field around the front tire is measured by scanning using a single-point pressure measuring valve provided by the wind tunnel test. During the measurement, a mobile measuring frame fixed to the top of the wind tunnel can be positioned at the measurement point. When measuring the pressure of a cross section, the staff needs to use the mobile measuring frame to perform multiple single-point scans on site. During the movement of the equipment, the staff are close to the equipment, which poses a risk of head and eye collisions. During the measurement process, each point measurement takes about 80 seconds. A cross section has about 32 points. Each test is calculated based on 6 working conditions, and each test takes 4.2 hours. The monthly electricity consumption is about 2.088kWh / month (5.8kw / H×0.35H / month), and 1.62 tons of waste are generated / month. The hourly wind tunnel test fee can reach tens of thousands of yuan. In addition, during each measurement, the corresponding operator needs to frequently operate the mobile measuring frame to position and measure the pressure data, which reduces the measurement efficiency and increases the workload of the personnel. To address this problem, the present application provides a multi-point flow field pressure measurement fixture to solve the above problems, which is explained below through an embodiment.

[0040] like Figure 1 As shown, an embodiment of the present application provides a multi-point flow field pressure measurement fixture, which includes a bracket 1, multiple air ducts 3 and multiple test elements.

[0041] The bracket 1 is provided with a plurality of air collecting pipes 2 at intervals, and the plurality of air collecting pipes 2 can correspond to a plurality of positions to be measured. The center lines of the air collecting pipes 2 are arranged in parallel, so as to achieve the synchronous measurement of the fluid pressure data at the plurality of positions to be measured. The air collecting pipes 2 include a first air inlet end 21 and a first air outlet end 22 arranged opposite to each other. Figure 2 Taking the direction shown as an example, the first air inlet end 21 of the air concentrating duct 2 is the left end of the air concentrating duct 2, and the first air outlet end 22 of the air concentrating duct 2 is the right end of the air concentrating duct 2. The first air inlet end 21 and the first air outlet end 22 are both open ends, allowing the wind to be measured to enter the air concentrating duct 2 through the first air inlet end 21 of the air concentrating duct 2 and then flow out from the first air outlet end 22 of the air concentrating duct 2.

[0042] The air duct 3 includes a second air inlet end 31 and a second air outlet end 32 which are arranged opposite to each other. Figure 2Taking the direction shown as an example, the second air inlet end 31 of the air duct 3 is the left end of the air duct 3, and the second air outlet end 32 of the air duct 3 is the right end of the air duct 3. The second air inlet end 31 and the second air outlet end 32 are both open ends, allowing the wind to be measured to enter the air duct 3 through the second air inlet end 31 of the air duct 3 and then flow out from the second air outlet end 32 of the air duct 3. The second air inlet end 31 of each air duct 3 is disposed inside an air concentrating duct 2 and is disposed toward the first air inlet end 21 of the air concentrating duct 2. The wind to be measured can flow into the air duct 3 through the air concentrating duct 2. Each test element is disposed at the second air outlet end 32 of an air duct 3. The wind to be measured in the air duct 3 flows toward the test element. The test element is used to measure fluid pressure data, wherein the fluid pressure data at this location is specifically the wind pressure of the wind to be measured.

[0043] The multi-point flow field pressure measurement fixture provided by the present invention supports multiple air collecting tubes 2 at multiple detection positions through a bracket 1. The wind to be measured enters the corresponding test element through the air collecting tube 2 and the air guide tube 3 to detect the fluid pressure data. The fluid pressure data at multiple positions can be obtained at one time, which increases the measurement efficiency. When measuring the wind resistance of the entire vehicle, the pressure distribution of a certain cross section of the flow field is measured synchronously to analyze the flow field as a basis for improving the wind resistance coefficient. In addition, the multi-point flow field pressure measurement fixture has a simple structure, is easy to carry, and is simple to install. It can be operated by one person, saving working hours and reducing employee labor intensity.

[0044] In one embodiment, this multi-point flow field pressure measurement fixture can be used in full-vehicle wind resistance tests to measure the drag of airflow on the vehicle, specifically the impact of the flow field on the side of the vehicle's front tires on the drag coefficient. By placing the multi-point flow field pressure measurement fixture on the front side of the vehicle, fluid pressure data from multiple test locations can be measured simultaneously, increasing measurement efficiency, reducing wind tunnel laboratory usage time, and improving economic efficiency. This eliminates the need for workers to frequently move and operate measurement points, reducing workload and the risk of head and eye injuries caused by close proximity to the equipment.

[0045] It is understandable that the multi-point flow field pressure measurement fixture can also measure fluid pressure data at other locations of the vehicle, such as the side of the rear tire. In addition, it can also measure the flow field pressure around various objects in the wind tunnel (motorcycles, high-speed rail models, bridge models).

[0046] In some embodiments, combined Figure 1 and Figure 2 As shown, the air guide duct 3 is a rigid tube, and each air collecting duct 2 is connected to the bracket 1 through the corresponding air guide duct 3 .

[0047] In this design, the air collecting duct 2 and the bracket 1 are connected by a rigid air guide duct 3, which can reduce the installation of other supporting components, simplify the structure, reduce the overall weight of the bracket 1, and reduce the impact on the airflow in the surrounding flow field, thereby improving measurement accuracy.

[0048] In some embodiments, the test element includes a pressure sensor, which is a sensor used to measure pressure. The second air inlet end 31 of the air duct 3 is connected to the air collecting duct 2. The portion of the air duct 3 near the second air outlet end 32 is connected to the bracket 1, leaving the second air outlet end 32 of the air duct 3 open. A hose of the pressure sensor is connected to the second air outlet end 32 of the air duct 3.

[0049] The connection between the air duct 3 and the bracket 1 is as follows: the air duct 3 is bent near the second air outlet end 32 and connected to the bracket 1 at the bent position. In this case, the second air outlet end 32 of the air duct 3 is located outside the bracket 1 and connected to the pressure sensor's hose. Alternatively, the second air outlet end 32 of the air duct 3 can be inserted into the bracket 1, fixed at the connection point between the air duct 3 and the bracket 1, and the pressure sensor's hose can be connected to the second air outlet end 32 of the air duct 3 inside the bracket 1. The other end of the pressure sensor's hose then exits the bracket 1 and connects to the pressure sensor, thus optimizing the duct layout.

[0050] It can be seen that the design of the air duct 3 and the connection method with the hose of the pressure sensor are not restricted and can be designed according to actual needs.

[0051] In some embodiments, the air guide duct 3 includes a horizontal section and a vertical section, one end of the horizontal section is connected to the bracket 1, and the other end of the horizontal section is connected to the vertical section. The end of the vertical section away from the horizontal section is designed to be in the corresponding air collecting duct 2 and is arranged toward the first air inlet end 21 of the air collecting duct 2.

[0052] In this design, the air collecting pipe 2 can be supported at a designated position by the action of the horizontal section and the vertical section, which is convenient for data measurement.

[0053] In some embodiments, as Figure 1 As shown, the bracket 1 is further provided with an oblique brace 15 , one end of the oblique brace 15 is connected to the bracket 1 , and the other end of the oblique brace 15 is connected to the vertical section of the air duct 3 to increase the structural strength of the air duct 3 .

[0054] In some embodiments, as Figure 2As shown, a mounting hole is provided on the air concentrating duct 2, through which the air guide duct 3 passes. The centerline of the air concentrating duct 2 is collinear with the centerline of the air guide duct 3 within the air concentrating duct 2. The mounting hole is provided on the wall of the air concentrating duct 2 and is a through hole. The air guide duct 3 passes through the mounting hole, and the connection between the air guide duct 3 and the mounting hole is fixed, so that the position of the air guide duct 3 and the air concentrating duct 2 is relatively fixed.

[0055] Under this design method, it is convenient to install and position the air collecting pipe 2 and the air guide pipe 3, and the center line of the air collecting pipe 2 and the center line of the air guide pipe 3 inside the air collecting pipe 2 are arranged collinearly, which makes it convenient for the wind to be measured to pass through the air collecting pipe 2 and enter the air guide pipe 3, thereby increasing the accuracy of the measurement results.

[0056] In some embodiments, as Figure 1 As shown, the bracket 1 includes a base 11 and a first support frame 12 arranged on the base 11 , and a plurality of air collecting pipes 2 are arranged on the first support frame 12 , and the plurality of air collecting pipes 2 are arranged at intervals along the length direction of the first support frame 12 .

[0057] Under this design, it is convenient to install multiple air collecting pipes 2 through the first support frame 12, and ensure that the distribution of the air collecting pipes 2 meets the measurement requirements. In order to ensure the stability of the bracket 1 structure, the base 11 should have a certain area to meet the stable support requirements.

[0058] In some embodiments, the first support frame 12 is arranged along the horizontal direction. In this case, the multiple air collecting pipes 2 are arranged at intervals along the horizontal direction, so that the support frame 1 is provided with multiple measuring points in the horizontal direction.

[0059] It is understandable that the extension direction of the first support frame 12 may also form a certain angle with the horizontal direction. These are not restrictive and can be designed according to actual needs.

[0060] In some embodiments, the air collecting duct 2 is connected to the first support frame 12 through the air guide duct 3. At this time, multiple air guide ducts 3 along the length direction of the first support frame 12 are connected through the cross brace 14, so that the multiple air guide ducts 3 are connected to the cross brace 14 into one, thereby increasing the structural strength.

[0061] In some embodiments, there are multiple first support frames 12 , and the length directions of the multiple first support frames 12 are parallel.

[0062] In this design, by increasing the number of first support frames 12 and thus increasing the number of air collecting pipes 2 arranged, the multi-point flow field pressure measurement fixture can measure fluid pressure data at multiple positions at one time, thereby increasing measurement efficiency.

[0063] In some embodiments, the first support frame 12 is a rod-shaped structure and is arranged in the horizontal direction. In this case, the multiple air collecting pipes 2 on the same first support frame 12 are arranged at intervals in the horizontal direction. The multiple first support frames 12 are arranged at intervals in the vertical direction, so that the multiple air collecting pipes 2 are arranged in the vertical plane according to design requirements.

[0064] In some embodiments, as Figure 1 As shown, there are four first support frames 12, and each first support frame 12 is provided with four groups of air collecting ducts 2. The four groups of air collecting ducts 2 are arranged at intervals along the length direction of the first support frame 12, and each group of air collecting ducts 2 includes two air collecting ducts 2 symmetrically arranged along the vertical direction.

[0065] It is understandable that the extension direction of the first support frame 12 may also be at a certain angle to the horizontal direction, and the spacing direction of multiple first support frames 12 may not be completely perpendicular to the extension direction of the first support frame 12. These are not restrictive and can be designed according to actual needs.

[0066] In some embodiments, the first air inlet ends 21 of the plurality of air collecting ducts 2 are located in the same plane.

[0067] This design facilitates obtaining fluid pressure data for the wind to be measured at the same interface. It is understood that when the experimental goal is not to obtain fluid pressure data for the wind to be measured at the same interface, the first air inlet ends 21 of the multiple air collecting pipes 2 are not located in the same plane, and the specific layout can be designed according to actual needs.

[0068] In some embodiments, the first air inlet ends 21 of the plurality of air collecting ducts 2 are located in the same vertical plane.

[0069] In some embodiments, as Figure 1 As shown, the bracket 1 further includes a second support frame 13 , one end of the second support frame 13 is connected to the base 11 , and each first support frame 12 is connected to the second support frame 13 .

[0070] In this design, the first support frame 12 is connected to the bracket 1 through the second support frame 13 to ensure the installation and positioning effect of the first support frame 12.

[0071] In some embodiments, the second support frame 13 is a rod-shaped structure and extends in the vertical direction. There are two second support frames 13, and the two second support frames 13 are arranged at intervals in the horizontal direction. The first support frame 12 extends in the horizontal direction, and each first support frame 12 is connected to the two second support frames 13 to ensure the fixing effect of the first support frame 12.

[0072] In some embodiments, as Figure 3As shown, the first support frame 12 includes a first section 121 and a second section 122, and the first section 121 and the second section 122 are arranged along the length direction of the first support frame 12, and at least one air collecting duct 2 is provided on the first section 121 and the second section 122; the first section 121 and the second section 122 are connected by an adjustment structure, and the adjustment structure is used to adjust the distance between the first section 121 and the second section 122 along the length direction of the first support frame 12.

[0073] Under this design, the distance between the first section 121 and the second section 122 along the length direction of the first support frame 12 is adjusted by adjusting the structure, thereby changing the distance between the two adjacent air collecting pipes 2 in the length direction of the first support frame 12 to meet the distance requirements between the two adjacent air collecting pipes 2 in different test scenarios and increase the scope of application.

[0074] In some embodiments, the first section 121 and the second section 122 are sleeved together. Specifically, the first section 121 is sleeved around the outer periphery of the second section 122, and the first section 121 and the second section 122 are movable along the length of the second section 122. The adjustment structure includes an electric push rod disposed inside the first section 121, one end of the electric push rod being connected to the interior of the first section 121, and the other end of the electric push rod being connected to the second section 122. The electric push rod can be extended and retracted to drive the second section 122 to move relative to the first section 121 along the length of the second section 122, thereby adjusting the distance between the air collecting ducts 2 located on the first section 121 and the second section 122.

[0075] In other embodiments, the first section 121 and the second section 122 are sleeved together. Specifically, the first section 121 is sleeved around the outer circumference of the second section 122, and the first section 121 and the second section 122 are movable along the length of the second section 122. The adjustment structure includes a locking nut that penetrates the wall of the first section 121. The relative position of the first section 121 and the second section 122 can be adjusted by loosening the locking nut. The locking nut is then tightened so that the end of the locking nut presses against the outer wall of the second section 122, thereby securing the first section 121.

[0076] It can be seen that the setting method of the adjustment structure of the present application is not restricted and can be designed according to actual needs.

[0077] It is understandable that Figure 3 The diagram shows an embodiment in which the first support frame 12 includes a first section 121 and a second section 122. In other embodiments, the first support frame 12 may include multiple first sections 121 and multiple second sections 122, and the multiple first sections 121 and multiple second sections 122 are arranged at intervals and are sequentially connected, and adjacent first sections 121 and second sections 122 can slide relative to each other.

[0078] In some embodiments, as Figure 1 As shown, the bracket 1 also includes a support rod 16, one end of the support rod 16 is connected to the second support frame 13, and the other end of the support rod 16 is connected to the base 11, so that the support rod 16 is supported on the side of the second support frame 13 away from the air collection duct 2, so as to provide sufficient support for the second support frame 13 and ensure the stability of the bracket 1 structure during the test.

[0079] In some embodiments, the distance between the second air inlet end 31 of the air guide 3 and the first air inlet end 21 of the corresponding air collecting duct 2 is 8-12 mm. Preferably, the distance between the second air inlet end 31 of the air guide 3 and the first air inlet end 21 of the corresponding air collecting duct 2 is 10 mm.

[0080] Under this design, the wind to be measured that enters the air collecting pipe 2 enters the air guiding pipe 3 smoothly, ensuring the accuracy of the measurement result.

[0081] In some embodiments, the distance between two adjacent air collecting pipes 2 in the horizontal direction is 90-110 mm. Preferably, the distance between two adjacent air collecting pipes 2 in the horizontal direction is 100 mm.

[0082] In some embodiments, the vertical distance between two adjacent air collecting pipes 2 is 90-110 mm. Preferably, the vertical distance between two adjacent air collecting pipes 2 is 100 mm.

[0083] In some embodiments, the distance between the air collecting pipe 2 located on the lowest first support frame 12 and the ground is 60-80 mm, preferably 70 mm.

[0084] The air collecting duct 2 arranged in this manner can meet the multi-point testing requirements of the flow field pressure next to the front wheels of the vehicle.

[0085] In the description of the embodiments of the present application, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0086] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A multi-point flow field pressure measurement fixture, characterized in that: include: A bracket (1), wherein a plurality of air collecting pipes (2) are arranged at intervals on the bracket (1), the center lines of the air collecting pipes (2) are arranged in parallel, the air collecting pipes (2) include a first air inlet end (21) and a first air outlet end (22) arranged opposite to each other, and the first air inlet end (21) and the first air outlet end (22) are both open ends; A plurality of air ducts (3) and a plurality of test elements, wherein the air ducts (3) include a second air inlet end (31) and a second air outlet end (32) that are arranged opposite to each other, and the second air inlet end (31) and the second air outlet end (32) are both open ends; the second air inlet end (31) of each of the air ducts (3) is arranged inside an air collecting pipe (2) and is arranged toward the first air inlet end (21) of the air collecting pipe (2); each of the test elements is arranged at the second air outlet end (32) of one of the air ducts (3), and the test element is used to measure fluid pressure data.

2. The multi-point flow field pressure measurement fixture according to claim 1, characterized in that: The air guide pipe (3) is a rigid pipe, and each of the air collecting pipes (2) is connected to the bracket (1) via the corresponding air guide pipe (3).

3. The multi-point flow field pressure measurement fixture according to claim 1, characterized in that: The air collecting pipe (2) is provided with a mounting hole, the air guide pipe (3) passes through the mounting hole, and the center line of the air collecting pipe (2) and the center line of the air guide pipe (3) inside the air collecting pipe (2) are collinearly arranged.

4. The multi-point flow field pressure measurement fixture according to any one of claims 1 to 3, characterized in that: The bracket (1) comprises a base (11) and a first support frame (12) arranged on the base (11); a plurality of air collecting pipes (2) are arranged on the first support frame (12); and the plurality of air collecting pipes (2) are arranged at intervals along the length direction of the first support frame (12).

5. The multi-point flow field pressure measurement fixture according to claim 4, characterized in that: There are multiple first support frames (12), and the length directions of the multiple first support frames (12) are parallel.

6. The multi-point flow field pressure measurement fixture according to claim 5, characterized in that: The first air inlet ends (21) of the plurality of air collecting pipes (2) are located in the same plane.

7. The multi-point flow field pressure measurement fixture according to claim 5, characterized in that: The bracket (1) further comprises a second support frame (13), one end of the second support frame (13) is connected to the base (11), and each of the first support frames (12) is connected to the second support frame (13).

8. The multi-point flow field pressure measurement fixture according to claim 4, characterized in that: The first support frame (12) comprises a first section (121) and a second section (122), the first section (121) and the second section (122) are arranged along the length direction of the first support frame (12), and at least one air collecting duct (2) is arranged on the first section (121) and the second section (122); the first section (121) and the second section (122) are connected by an adjustment structure, and the adjustment structure is used to adjust the distance between the first section (121) and the second section (122) along the length direction of the first support frame (12).

9. The multi-point flow field pressure measurement fixture according to any one of claims 1 to 3, characterized in that: The distance between the second air inlet end (31) of the air guide pipe (3) and the corresponding first air inlet end (21) of the air collecting pipe (2) is 8-12 mm.

10. The multi-point flow field pressure measurement fixture according to any one of claims 1 to 3, characterized in that: The distance between two adjacent air collecting pipes (2) in the horizontal direction is 90-110 mm; And / or, the distance between two adjacent air collecting pipes (2) in the vertical direction is 90-110 mm.

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