Boundary layer measuring device

Abstract

The utility model discloses a boundary layer measuring device, which comprises a mounting bracket, a Y-direction adjusting mechanism, a Z-direction adjusting mechanism and a measuring rake total pressure pipe, and is characterized in that the mounting bracket is mounted on a wind tunnel floor and comprises a track, and the track is separated from the wind tunnel floor; the Y-direction adjusting mechanism moves in the Y direction along the track; the Z-direction adjusting mechanism is connected to one side of the Y-direction adjusting mechanism in the X direction; the measuring rake total pressure pipe is connected to one side of the Z-direction adjusting mechanism in the X direction, and the Z-direction adjusting mechanism is used for driving the measuring rake total pressure pipe to move in the Z direction. According to the boundary layer measuring device, the measuring rake total pressure pipe can move in the Y direction and the Z direction by adjusting the Y-direction adjusting mechanism and the Z-direction adjusting mechanism, the boundary layer measuring device can be conveniently used, the testing range of the boundary layer measuring device can be wider, and pneumatic interference is small.

Description

Technical Field

[0001] The utility model relates to the technical field of aerodynamic force testing in wind tunnel tests, and particularly relates to a boundary layer measuring device. Background Art

[0002] The boundary layer thickness is one of the key contents of the flow field calibration in the wind tunnel test section. It not only affects the uniformity of the flow field in the model area, but also has a significant impact on the interference corrections such as air flow blockage and flow field distortion. Accurately measuring the internal flow velocity and pressure distribution of the boundary layer is a necessary condition for improving the accuracy of test data.

[0003] In the related art, when measuring the boundary layer thickness, it is necessary to measure multiple positions, and the measuring rake of the boundary layer measuring device is a fixed part, so it is necessary to frequently move the boundary layer measuring device, which causes inconvenience in use. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a boundary layer measuring device. By adjusting the Y-direction adjusting mechanism and the Z-direction adjusting mechanism, the total pressure tube of the measuring rake can move in the Y-direction and the Z-direction, which not only facilitates the use of the boundary layer measuring device, but also enables the boundary layer measuring device to have a wider test range and less aerodynamic interference.

[0005] The boundary layer measuring device according to the embodiment of the utility model includes: a mounting bracket, the mounting bracket is mounted on the wind tunnel floor, the mounting bracket includes a track, and the track is spaced apart from the wind tunnel floor; a Y-direction adjusting mechanism, the Y-direction adjusting mechanism can move in the Y-direction along the track; a Z-direction adjusting mechanism, the Z-direction adjusting mechanism is connected to one side of the Y-direction adjusting mechanism in the X-direction; a measuring rake total pressure tube, the measuring rake total pressure tube is connected to one side of the Z-direction adjusting mechanism in the X-direction, and the Z-direction adjusting mechanism is used to drive the measuring rake total pressure tube to move in the Z-direction.

[0006] The boundary layer measuring device according to the embodiment of the utility model can realize the movement of the measuring rake total pressure tube in the Y-direction and the Z-direction by adjusting the Y-direction adjusting mechanism and the Z-direction adjusting mechanism, which not only facilitates the use of the boundary layer measuring device, but also enables the boundary layer measuring device to have a wider test range and less aerodynamic interference.

[0007] According to some embodiments of the utility model, the Y-direction adjusting mechanism includes a moving frame and a Y-direction fixing member, the moving frame is sleeved on the outer peripheral side of the track, and the Y-direction fixing member is used to fix the moving frame on the track.

[0008] According to some embodiments of the utility model, the Y-direction fixing member includes a Y-direction fixing bolt, and the Y-direction fixing bolt passes through the moving frame to abut against the track.

[0009] According to some embodiments of the present utility model, the Z-direction adjusting mechanism includes a Z-direction moving member and a Z-direction adjusting member, and the Z-direction adjusting member is used to adjust the movement of the Z-direction moving member in the Z direction.

[0010] According to some embodiments of the present utility model, the boundary layer measuring device further includes a support frame, and the support frame is connected between the total pressure tube of the measuring rake and the Z-direction moving member.

[0011] According to some embodiments of the present utility model, the total pressure tube of the measuring rake includes a first row of total pressure tubes and a second row of total pressure tubes arranged side by side in the Y direction, and both the first row of total pressure tubes and the second row of total pressure tubes extend in the X direction.

[0012] According to some embodiments of the present utility model, the first row of total pressure tubes includes a plurality of first branch tubes arranged in the Z direction, the second row of total pressure tubes includes a plurality of second branch tubes arranged in the Z direction, and the plurality of first branch tubes and the plurality of second branch tubes are arranged staggeredly in the Z direction.

[0013] According to some embodiments of the present utility model, the first row of total pressure tubes and the second row of total pressure tubes are arranged in abutting contact in the Y direction.

[0014] According to some embodiments of the present utility model, the mounting bracket further includes: a plurality of support rods, and the plurality of support rods are connected to the Z-direction side of the track.

[0015] According to some embodiments of the present utility model, the mounting bracket further includes: a plurality of bases, the number of the bases is equal to and corresponds to the number of the support rods one by one, the bases are located on the side of the support rods facing the wind tunnel floor, and the bases are mounted on the wind tunnel floor.

[0016] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0018] Figure 1 is a side view of a boundary layer measuring device according to some embodiments of the present utility model;

[0019] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0020] Figure 3 is Figure 1 a top view of the boundary layer measuring device in

[0021] Reference numerals:

[0022] 100, boundary layer measuring device;

[0023] 10, mounting bracket; 11, track; 12, support rod; 13, base; 14, fixing rod;

[0024] 20, Y-direction adjusting mechanism; 21, moving frame; 22, Y-direction fixing member;

[0025] 30, Z-direction adjusting mechanism; 31, Z-direction moving member; 32, Z-direction adjusting member;

[0026] 40, support frame;

[0027] 50, measuring rake total pressure tube; 51, first row of total pressure tubes; 511, first branch tube. Detailed implementation manners

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "mount", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] The following is a reference to Figures 1 - 3 describe the boundary layer measurement device 100 according to an embodiment of the present invention.

[0032] For the boundary layer measurement device 100 according to an embodiment of the present invention, the boundary layer measurement device 100 includes a mounting bracket 10, a Y-direction adjustment mechanism 20, a Z-direction adjustment mechanism 30, and a measurement rake total pressure tube 50. The mounting bracket 10 is used to mount the Y-direction adjustment mechanism 20, the Z-direction adjustment mechanism 30, and the measurement rake total pressure tube 50, and provides a mounting position for the Y-direction adjustment mechanism 20, the Z-direction adjustment mechanism 30, and the measurement rake total pressure tube 50.

[0033] Wherein, in the present invention, the Y direction is the left-right direction of the vehicle, the Z direction is the up-down direction of the vehicle, and the X direction is the front-back direction of the vehicle.

[0034] The boundary layer measurement device 100 is used to measure the thickness of the boundary layer in the wind tunnel. When the vehicle is stationary in the wind tunnel, a velocity is applied to the air in the wind tunnel. Since when the gas flows over the solid surface, a thin fluid region will be formed in the vicinity of the solid surface. In this region, due to the viscous action (i.e., the viscosity of the fluid) between the gas and the solid surface, the velocity of the gas gradually increases from zero at the surface to the velocity in the mainstream region. This region is the boundary layer; while when the vehicle is actually running, the vehicle moves but the air does not move, and the air has a velocity relative to the vehicle, which is opposite to that during the wind tunnel test. Therefore, a series of measures need to be taken in the wind tunnel to reduce the thickness of the boundary layer to approximate the actual operation of the vehicle. Therefore, it is particularly important to measure the thickness of the boundary layer.

[0035] The mounting bracket 10 is mounted on the wind tunnel floor. The mounting bracket 10 includes a track 11, and the track 11 is spaced apart from the wind tunnel floor. The mounting bracket 10 may further include a support rod 12 for supporting the track 11 on the wind tunnel floor. The Y-direction adjustment mechanism 20 can move in the Y direction along the track 11. The Z-direction adjustment mechanism 30 is connected to one side of the Y-direction adjustment mechanism 20 in the X direction, and the Z-direction adjustment mechanism 30 can move in the Z direction. The measurement rake total pressure tube 50 is connected to one side of the Z-direction adjustment mechanism 30 in the X direction, and the Z-direction adjustment mechanism 30 is used to drive the measurement rake total pressure tube 50 to move in the Z direction.

[0036] When measuring the thickness of the boundary layer using the boundary layer measuring device 100, the boundary layer measuring device 100 is installed on the wind tunnel floor. First, measure the thickness of the boundary layer at a pre-selected position. After the measurement here, the total pressure tube 50 of the measuring rake can be moved in the Y direction by adjusting the Y-direction adjusting mechanism 20 to measure the position after the movement; after adjusting the Y-direction adjusting mechanism 20, the Z-direction adjusting mechanism 30 can be further adjusted to drive the total pressure tube 50 of the measuring rake to move in the Y and Z directions to measure the position after the movement. Without moving the boundary layer measuring device 100, by only adjusting the Y-direction adjusting mechanism 20 and the Z-direction adjusting mechanism 30, the total pressure tube 50 of the measuring rake can be moved in the Y and Z directions, making the test range of the boundary layer measuring device 100 wider, with less aerodynamic interference, and more convenient to use.

[0037] For the boundary layer measuring device 100 according to the embodiment of the present invention, by adjusting the Y-direction adjusting mechanism 20 and the Z-direction adjusting mechanism 30, the total pressure tube 50 of the measuring rake can be moved in the Y and Z directions, which not only facilitates the use of the boundary layer measuring device 100, but also makes the test range of the boundary layer measuring device 100 wider and has less aerodynamic interference.

[0038] According to some embodiments of the present invention, referring to Figures 1 - 3 , the Y-direction adjusting mechanism 20 includes a moving frame 21 and a Y-direction fixing member 22. The moving frame 21 is sleeved on the outer peripheral side of the track 11, which can increase the structural strength of the connection between the moving frame 21 and the track 11 and prevent the moving frame 21 from falling off the track 11; the moving frame 21 can be fixed to the track 11 by the Y-direction fixing member 22, which can prevent the moving frame 21 from continuing to move along the track 11 and also makes the way of fixing the moving frame 21 to the track 11 simple.

[0039] According to some embodiments of the present invention, referring to Figures 1 - 3 , the Y-direction fixing member 22 includes a Y-direction fixing bolt. The Y-direction fixing bolt passes through the moving frame 21 to abut against the track 11, making the way of fixing the moving frame 21 by the Y-direction fixing bolt simple; when it is necessary to move the moving frame 21, the Y-direction fixing bolt can be loosened so that the Y-direction fixing bolt no longer abuts against the track 11, and the moving frame 21 can move in the Y direction along the track 11.

[0040] For example, the moving frame 21 has a first fixing hole with internal threads, and the Y-direction fixing bolt has external threads. The Y-direction fixing bolt passes through the first fixing hole so that the internal threads cooperate with the external threads to prevent the Y-direction fixing bolt from falling out of the first fixing hole.

[0041] According to some embodiments of the present invention, referring to Figures 1 - 3, the Z-direction adjustment mechanism 30 includes a Z-direction moving member 31 and a Z-direction adjusting member 32. The Z-direction adjusting member 32 is used to adjust the movement of the Z-direction moving member 31 in the Z direction, and the movement of the Z-direction moving member 31 in the Z direction can drive the total pressure tube 50 of the measuring rake to move in the Z direction.

[0042] For example, the Z-direction moving member 31 may include a lifting table, and the Z-direction adjusting member 32 may include an adjusting knob. By rotating the adjusting knob, the lifting table can be driven to move in the Z direction. For another example, the Z-direction adjustment mechanism 30 may include a driving cylinder. The Z-direction moving member 31 may include a cylinder block and a telescopic rod, and the Z-direction adjusting member 32 may include a piston for driving the telescopic rod to move in the Z direction.

[0043] In some specific examples, when measuring the boundary layer thickness, loosen the Y-direction fixing bolt, adjust the position of the moving frame 21 in the Y direction, move the boundary layer measuring device 100 to the position to be measured, and adjust the position of the total pressure tube 50 of the measuring rake in the Z direction through the Z-direction adjusting member 32. After determining the measurement range, connect the hose to the total pressure tube 50 of the measuring rake, and use a pressure scanning valve instrument to complete the measurement of the boundary layer thickness.

[0044] According to some embodiments of the present invention, referring to Figures 1 - 3 , the boundary layer measuring device 100 further includes a support frame 40. The support frame 40 is connected between the total pressure tube 50 of the measuring rake and the Z-direction moving member 31, facilitating the connection of the total pressure tube 50 of the measuring rake to the Z-direction moving member 31 and the installation of the total pressure tube 50 of the measuring rake.

[0045] For example, the support frame 40 may be connected between the upper surface of the Z-direction moving member 31 and the upper surface of the total pressure tube 50 of the measuring rake. For another example, the support frame 40 may be connected between the side surface of the Z-direction moving member 31 and the side surface of the total pressure tube 50 of the measuring rake.

[0046] According to some embodiments of the present invention, referring to Figures 1 - 3 , the total pressure tube 50 of the measuring rake includes a first row of total pressure tubes 51 and a second row of total pressure tubes arranged side by side in the Y direction. The first row of total pressure tubes 51 and the second row of total pressure tubes both extend in the X direction. Both ends of the first row of total pressure tubes 51 and the second row of total pressure tubes in the X direction have openings. A total pressure tube connecting hose is connected to the openings near the rear of the vehicle of the first row of total pressure tubes 51 and the second row of total pressure tubes, and a pressure scanning valve instrument is used to complete the measurement of the boundary layer.

[0047] According to some embodiments of the present invention, referring to Figures 1 - 3 , the first row of total pressure tubes 51 includes a plurality of first branch tubes 511 arranged in the Z direction, and the second row of total pressure tubes includes a plurality of second branch tubes arranged in the Z direction. The plurality of first branch tubes 511 and the plurality of second branch tubes are arranged staggeredly in the Z direction.

[0048] Multiple first branch pipes 511 can measure multiple different data within different unit lengths in the Z direction, and multiple second branch pipes can measure multiple different data within different unit lengths in the Z direction, so that more test data can be obtained within a unit length. The total pressure pipe 50 of the measurement rake adopts a double-row total pressure pipe arrangement, and the double-row total pressure pipes are arranged staggeredly, making the effective measuring point interval smaller, thereby ensuring more test data within a unit length in the Z direction and making the spatial resolution of the boundary layer measurement smaller.

[0049] According to some embodiments of the present invention, referring to Figures 1 - 3 , the first row of total pressure pipes 51 and the second row of total pressure pipes are arranged in contact with each other in the Y direction, so that the effective measuring point interval of the first row of total pressure pipes 51 and the second row of total pressure pipes in the Y direction is smaller, thereby ensuring more test data within a unit length in the Y direction and effectively improving the spatial resolution of the boundary layer measurement.

[0050] According to some embodiments of the present invention, referring to Figures 1 - 3 , the mounting bracket 10 further includes a plurality of support rods 12. The plurality of support rods 12 are connected to one side of the track 11 in the Z direction to support the track 11 so that the track 11 can be spaced apart from the wind tunnel floor. There are two support rods 12, and the two support rods 12 are respectively located on the opposite sides of the track 11 along the Y direction, facilitating the measurement of the total pressure pipe 50 of the measurement rake.

[0051] According to some embodiments of the present invention, referring to Figures 1 - 3 , the mounting bracket 10 further includes a plurality of bases 13. The number of bases 13 is equal to and corresponds to the number of support rods 12 one by one. The bases 13 are located on the side of the support rods 12 facing the wind tunnel floor, and the bases 13 are installed on the wind tunnel floor. The bases 13 can increase the connection area between the boundary layer measurement device 100 and the wind tunnel floor, and further increase the stability of the boundary layer measurement device 100 installed on the wind tunnel floor.

[0052] For example, there are two bases 13, and the two bases 13 are respectively fixedly connected to the corresponding support rods 12. A fixing rod 14 is also connected between the base 13 and the support rod 12, and the fixing rod 14 extends obliquely to increase the connection strength between the base 13 and the support rod 12.

[0053] In the description of this specification, the description referring to terms such as "some embodiments", "optionally", "further", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0054] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A boundary layer measuring device, characterized in that, Comprising: An installation bracket, which is installed on the wind tunnel floor. The installation bracket includes a track, and the track is spaced apart from the wind tunnel floor; A Y-direction adjustment mechanism, which can move in the Y direction along the track; A Z-direction adjustment mechanism, which is connected to one side of the Y-direction adjustment mechanism in the X direction; A measuring rake total pressure tube, which is connected to one side of the Z-direction adjustment mechanism in the X direction, and the Z-direction adjustment mechanism is used to drive the measuring rake total pressure tube to move in the Z direction.

2. The boundary layer measuring device according to claim 1, wherein The Y-direction adjustment mechanism includes a moving frame and a Y-direction fixing member. The moving frame is sleeved on the outer peripheral side of the track, and the Y-direction fixing member is used to fix the moving frame on the track.

3. The boundary layer measuring device according to claim 2, wherein The Y-direction fixing member includes a Y-direction fixing bolt, and the Y-direction fixing bolt passes through the moving frame to abut against the track.

4. The boundary layer measuring device according to claim 1, characterized in that, The Z-direction adjustment mechanism includes a Z-direction moving member and a Z-direction adjusting member, and the Z-direction adjusting member is used to adjust the Z-direction moving member to move in the Z direction.

5. The boundary layer measuring device according to claim 4, characterized in that, It further includes a support frame, and the support frame is connected between the measuring rake total pressure tube and the Z-direction moving member.

6. The boundary layer measuring device according to claim 1, characterized in that, The measuring rake total pressure tube includes a first row of total pressure tubes and a second row of total pressure tubes arranged side by side in the Y direction, and both the first row of total pressure tubes and the second row of total pressure tubes extend in the X direction.

7. The boundary layer measuring device according to claim 6, characterized in that, The first row of total pressure tubes includes a plurality of first branch tubes arranged in the Z direction, the second row of total pressure tubes includes a plurality of second branch tubes arranged in the Z direction, and the plurality of first branch tubes and the plurality of second branch tubes are arranged staggeredly in the Z direction.

8. The boundary layer measuring device according to any one of claims 6 or 7, characterized in that The first row of total pressure tubes and the second row of total pressure tubes are arranged in abutment in the Y direction.

9. The boundary layer measuring device according to claim 1, characterized in that, The installation bracket further includes: a plurality of support rods, and the plurality of support rods are connected to one side of the track in the Z direction.

10. The boundary layer measuring device according to claim 9, characterized in that, The installation bracket further includes: a plurality of bases, the number of the bases is equal to and corresponds to that of the support rods one by one. The bases are located on the side of the support rods facing the wind tunnel floor, and the bases are installed on the wind tunnel floor.

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