A multi-coordinate pneumatic probe calibration test bench

Abstract

The present invention discloses a multi - coordinate pneumatic probe calibration test bench, comprising: a probe clamping mechanism, an azimuth rotation mechanism, a sideslip angle turntable and a bottom turntable. The rotation center lines of the azimuth rotation mechanism, the sideslip angle turntable and the bottom turntable are perpendicular to each other; the rotation center line of the bottom turntable is perpendicular to the horizontal plane, the sideslip angle turntable is installed on the bottom turntable, and the azimuth rotation mechanism is installed on the sideslip angle turntable; the azimuth rotation mechanism includes a gear ring and a motor for driving the gear ring to rotate. The axis of the gear ring coincides with the rotation center line of the azimuth rotation mechanism, and the probe clamping mechanism is fixed on the gear ring; when the probe is clamped and fixed on the probe clamping mechanism, the probe tip is located on the axis of the gear ring. On the premise of minimizing the influence on the flow field as much as possible, it can be used for the calibration of both five - hole probes and seven - hole probes at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of probe calibration, and particularly to a multi-coordinate pneumatic probe calibration test bench. Background Art

[0002] Porous probes have advantages in flow field measurement, such as low equipment usage and maintenance costs, simple structure, convenient use, low requirements for the measurement environment, fast response, high accuracy, and the ability to measure large flow angles in the flow field. Common porous probes include three-hole probes, five-hole probes, and seven-hole probes. Due to limited measurement angles, three-hole probes can only be used for measuring relevant data in two-dimensional flow fields. When three-dimensional flow field measurement is required, five-hole probes and seven-hole probes need to be used.

[0003] The calibration schemes for five-hole probes and seven-hole probes are very different. Existing calibration test benches can only be used to calibrate five-hole probes or seven-hole probes. Wind tunnel laboratories need to introduce two calibration test benches simultaneously to meet the calibration requirements, resulting in excessive site occupation and equipment investment.

[0004] The basic principle of porous probe calibration is to use known flow field conditions to determine the pressure coefficient of the probe. When the flow field is blocked by the calibration test bench, turbulence is likely to occur, affecting the calibration accuracy of the porous probe. With the continuous development of China's aerospace field, porous probes applied to aerospace flow field testing have higher accuracy requirements during calibration. How to design a calibration test bench to minimize the impact on the flow field and improve the accuracy of porous probes after calibration has become a key research topic in recent years. Summary of the Invention

[0005] The present invention provides a multi-coordinate pneumatic probe calibration test bench, which can be used for calibrating both five-hole probes and seven-hole probes on the premise of minimizing the impact on the flow field.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A multi-coordinate pneumatic probe calibration test bench, comprising: a probe clamping mechanism, an azimuth rotation mechanism, a sideslip angle turntable, and a bottom turntable, wherein the rotation centerlines of the azimuth rotation mechanism, the sideslip angle turntable, and the bottom turntable are perpendicular to each other;

[0008] The rotation centerline of the bottom turntable is perpendicular to the horizontal plane. The sideslip angle turntable is installed on the bottom turntable, and the azimuth rotation mechanism is installed on the sideslip angle turntable;

[0009] The azimuth rotation mechanism includes a gear ring and a motor for driving the gear ring to rotate. The axis of the gear ring coincides with the rotation centerline of the azimuth rotation mechanism, and the probe clamping mechanism is fixed on the gear ring;

[0010] When the probe is clamped and fixed on the probe clamping mechanism, the probe tip of the probe is located on the axis of the gear ring.

[0011] Furthermore, the azimuth rotation mechanism further includes a housing, and the gear ring can rotate within the housing;

[0012] The motor is fixed on the housing, a gear is fixed on the output shaft of the motor, and the gear meshes with the gear ring;

[0013] A rotating bottom plate is fixed on the rotating disk of the bottom turntable, a first bracket and a second bracket are fixed on the rotating bottom plate and are arranged oppositely, a rotating shaft is provided at the top of the first bracket, the top of the second bracket is fixedly connected to the sideslip angle turntable, and both ends of the housing are fixedly connected to the rotating shaft and the rotating disk of the sideslip angle turntable respectively.

[0014] Furthermore, it further includes a slideway and a ball;

[0015] Slideways are provided on both sides of the gear ring, the slideways are fixed within the housing, grooves are provided on the opposite surfaces of the gear ring and the slideways, the balls are located between the gear ring and the slideways, and the balls can roll within the grooves.

[0016] Furthermore, the gear ring is an external gear ring.

[0017] Furthermore, the probe clamping mechanism includes a fixture adapter plate, an L-shaped probe fixture, and an L-shaped probe adapter block;

[0018] The L-shaped probe adapter block is fixed on the gear ring, the fixture adapter plate is provided with an oblong hole for connecting with the L-shaped probe adapter block and a bolt hole for connecting with the L-shaped probe fixture, and the L-shaped probe fixture can clamp the rod of the probe.

[0019] Furthermore, the probe clamping mechanism includes a fixture support rod, a straight probe fixture, and a straight probe adapter block;

[0020] The straight probe adapter block is fixed on the gear ring, one end of the fixture support rod is fixed to the straight probe adapter block, and the other end of the fixture support rod is fixed to the straight probe fixture.

[0021] Furthermore, a first inclined surface is provided on one side of the fixture support rod close to the outlet of the calibration wind tunnel, and a second inclined surface is provided on one side of the straight probe fixture close to the outlet of the calibration wind tunnel.

[0022] Furthermore, reinforcing rib plates are fixed on both the first bracket and the second bracket.

[0023] Furthermore, it further includes a workbench, and the bottom turntable is fixed on the workbench.

[0024] Advantages of the present invention:

[0025] A multi - coordinate system pneumatic probe calibration test bench provided by the present invention, when calibrating a five - hole probe, adjusts the angle of attack and sideslip angle of the probe through the bottom turntable and the sideslip angle turntable to fully cover the measurement range required by the five - hole probe in the future, ensuring that each probe hole obtains sufficient measurement;

[0026] When calibrating a seven - hole probe, adjusts the pitch angle and azimuth angle of the probe through the bottom turntable and the azimuth rotation mechanism to fully cover the measurement range required by the seven - hole probe in the future, ensuring that each probe hole obtains sufficient measurement;

[0027] When calibrating the five - hole probe, adjusts the angle of attack through the bottom turntable, and when calibrating the seven - hole probe, adjusts the pitch angle through the bottom turntable, enabling the multi - coordinate system pneumatic probe calibration test bench provided by the present invention to simultaneously meet the angle rotation requirements for calibrating the five - hole probe and the seven - hole probe, thereby reducing the site occupation and equipment investment;

[0028] Fix the probe clamping mechanism on the gear ring of the azimuth rotation mechanism, and the probe head clamped on the probe clamping mechanism is located on the axis of the gear ring, so that when calibrating, the airflow of the calibration wind tunnel directly passes through the central hole of the gear ring, with less blockage to the flow field, effectively reducing the generation of turbulence and improving the calibration accuracy of the multi - hole probe. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 Structural schematic of a multi - coordinate system pneumatic probe calibration test bench disclosed in Embodiment 1 of the present invention Figure 1 ;

[0031] Figure 2 Structural schematic of a multi - coordinate system pneumatic probe calibration test bench disclosed in Embodiment 1 of the present invention Figure 2 ;

[0032] Figure 3 Rear view of a multi - coordinate system pneumatic probe calibration test bench disclosed in Embodiment 1 of the present invention with some shells removed;

[0033] Figure 4 Structural schematic diagram of a multi - coordinate system pneumatic probe calibration test bench disclosed in Embodiment 2 of the present invention;

[0034] Figure 5Schematic diagram of a multi - coordinate pneumatic probe calibration test bench disclosed by the present invention with two types of probe clamping mechanisms installed simultaneously;

[0035] Figure 6 Front view of a multi - coordinate pneumatic probe calibration test bench disclosed by the present invention with two types of probe clamping mechanisms installed simultaneously;

[0036] Figure 7 For Figure 6 A - A cross - sectional view;

[0037] Figure 8 For Figure 7 Enlarged view at C;

[0038] Figure 9 For Figure 6 B - B cross - sectional view;

[0039] Figure 10 For Figure 9 Enlarged view at D;

[0040] Figure 11 Schematic diagram of the structure of the fixture adapter plate of a multi - coordinate pneumatic probe calibration test bench disclosed in Embodiment 1 of the present invention;

[0041] Figure 12 Schematic diagram of the structure of the probe (L - shaped probe) disclosed by the present invention;

[0042] Figure 13 Schematic diagram of the structure of the probe (straight probe) disclosed by the present invention;

[0043] Figure 14 Schematic diagram of the structure of the fixture support rod and the straight - probe fixture of a multi - coordinate pneumatic probe calibration test bench disclosed in Embodiment 2 of the present invention;

[0044] Figure 15 Schematic diagram of the working state of a multi - coordinate pneumatic probe calibration test bench with a pitch angle of 60° disclosed in Embodiment 1 of the present invention;

[0045] Figure 16 Schematic diagram of the working state of a multi - coordinate pneumatic probe calibration test bench with a sideslip angle of 40° disclosed in Embodiment 1 of the present invention.

[0046] In the figure:

[0047] 1. Calibrate the wind tunnel outlet; 2. The first bracket; 3. The housing; 4. The gear ring; 5. The probe; 51. The probe head; 52. The support rod; 6. The fixture adapter plate; 61. The oblong hole; 62. The bolt hole; 7. The motor; 8. The sideslip angle turntable; 9. The second bracket; 10. The stiffening rib plate; 11. The rotating bottom plate; 12. The bottom turntable; 13. The L-shaped probe fixture; 14. The gear; 15. The workbench; 16. The fixture support rod; 161. The first inclined surface; 17. The straight probe fixture; 171. The second inclined surface; 18. The L-shaped probe adapter block; 19. The straight probe adapter block; 20. The slideway; 21. The ball; 22. The rotating shaft. Detailed implementation mode

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] Embodiment 1

[0050] This embodiment provides a multi-coordinate pneumatic probe calibration test bench, as Figure 1 shown, including: a probe clamping mechanism, an azimuth rotation mechanism, a sideslip angle turntable 8 and a bottom turntable 12, and the rotation center lines of the azimuth rotation mechanism, the sideslip angle turntable 8 and the bottom turntable 12 are perpendicular to each other;

[0051] The rotation center line of the bottom turntable 12 is perpendicular to the horizontal plane, the sideslip angle turntable 8 is installed on the bottom turntable 12, and the azimuth rotation mechanism is installed on the sideslip angle turntable 8;

[0052] As Figure 1 shown, the azimuth rotation mechanism includes a gear ring 4 and a motor 7 for driving the rotation of the gear ring 4, the axis of the gear ring 4 coincides with the rotation center line of the azimuth rotation mechanism, and the probe clamping mechanism is fixed on the gear ring 4;

[0053] As Figure 12 shown, when the probe 5 is clamped and fixed on the probe clamping mechanism, the probe head 51 of the probe 5 is located on the axis of the gear ring 4;

[0054] For the multi-coordinate pneumatic probe calibration test bench provided in this embodiment, when five-hole probe calibration is required, the angle of attack and sideslip angle of the probe 5 are adjusted by rotating the bottom turntable 12 and the sideslip angle turntable 9 to fully cover the future measurement range required by the five-hole probe, ensuring that each probe hole obtains sufficient measurement;

[0055] When seven-hole probe calibration is required, the pitch angle and azimuth angle of the probe 5 are adjusted by rotating the bottom turntable 12 and the azimuth rotation mechanism to fully cover the future measurement range required by the seven-hole probe, ensuring that each probe hole obtains sufficient measurement;

[0056] When calibrating the five-hole probe, the angle of attack is adjusted by the bottom turntable 12. When calibrating the seven-hole probe, the pitch angle is adjusted by the bottom turntable 12, so that a multi-coordinate pneumatic probe calibration test bench provided by the present invention can simultaneously meet the angle rotation requirements for calibrating the five-hole probe and the seven-hole probe, thereby reducing the site occupation and equipment investment;

[0057] The probe clamping mechanism is fixed on the gear ring 4 of the azimuth rotation mechanism, and the probe head 51 clamped and fixed on the probe clamping mechanism is located on the axis of the gear ring 4, so that when calibrating, the air flow discharged from the calibration wind tunnel outlet 1 directly passes through the central hole of the gear ring 4, and the blockage of the flow field is small, effectively reducing the generation of turbulence and improving the calibration accuracy of the multi-hole probe.

[0058] In a specific embodiment, as Figure 1 shown, the azimuth rotation mechanism further includes a housing 3, and the gear ring 4 can rotate within the housing 3;

[0059] As Figure 1 shown, the motor 7 is fixed on the housing 3, and a gear 14 is fixed on the output shaft of the motor 7. As Figure 3 shown, the gear 14 meshes with the gear ring 4;

[0060] As Figure 1 shown, a rotating bottom plate 11 is fixed on the rotating disk of the bottom turntable 12, and a first bracket 2 and a second bracket 9 are fixed on the rotating bottom plate 11 and arranged oppositely. As Figure 9 shown, a rotating shaft 22 is provided at the top of the first bracket 2, the top of the second bracket 9 is fixedly connected with a sideslip angle turntable 8, and both ends of the housing 3 are fixedly connected with the rotating disk of the rotating shaft 22 and the sideslip angle turntable 8 respectively;

[0061] In this embodiment, the axis of the rotating shaft 22 coincides with the rotation center line of the sideslip angle turntable 8. A bearing is provided at the top of the first bracket 2, and the rotating shaft 22 is in interference fit with the bearing. The rotating disk of the sideslip angle turntable 8 drives the housing 3 to rotate.

[0062] In a specific embodiment, as Figure 8 shown, it further includes a slideway 20 and a ball 21;

[0063] On both sides of the gear ring 4, there are slideways 20, which are fixed in the housing 3. Grooves are provided on the opposite surfaces of the gear ring 4 and the slideways 20. The balls 21 are located between the gear ring 4 and the slideways 20, and the balls 21 can roll in the grooves, enabling the gear ring 4 to rotate smoothly relative to the housing 3.

[0064] In a specific embodiment, the gear ring 4 is an external gear ring. As Figure 3 shown, compared with an internal gear ring, the external gear ring enables the gear 14 meshing with the gear ring 4 not to be located within the central hole of the gear ring 4, but within the housing 3, avoiding the airflow being blocked by the gear 14.

[0065] In a specific embodiment, as Figure 5 、 Figure 9 and Figure 10 shown, the probe clamping mechanism includes a fixture adapter plate 6, an L-shaped probe fixture 13, and an L-shaped probe adapter block 18;

[0066] The L-shaped probe adapter block 18 is fixed on the gear ring 4. As Figure 11 shown, the fixture adapter plate 6 is provided with an oblong hole 61 for connecting with the L-shaped probe adapter block 18 and a bolt hole 62 for connecting with the L-shaped probe fixture 13. The L-shaped probe fixture 13 can clamp the support rod 52 of the probe 5;

[0067] The gear ring 4, the fixture adapter plate 6, the L-shaped probe fixture 13, and the L-shaped probe adapter block 18 are all fixedly connected by bolts, facilitating installation and replacement.

[0068] In a specific embodiment, as Figure 2 and Figure 6 shown, reinforcing rib plates 10 are fixed on both the first bracket 2 and the second bracket 9 to improve the structural strength.

[0069] In a specific embodiment, as Figure 1 shown, it further includes a workbench 15, and the bottom turntable 12 is fixed on the workbench 15.

[0070] To ensure that each probe hole obtains sufficient measurement, when measuring a seven-hole probe, the pitch angle needs to be adjusted between 0° and 60° (the theoretical airflow angle that the seven-hole probe can measure can reach ±70°, but limited by manufacturing accuracy, it is generally only used for measurements of ±60°, so only the pitch angle between 0° and 60° is calibrated), the azimuth angle needs to be adjusted between 0° and 360°, and when measuring a five-hole probe, the sideslip angle and the angle of attack need to be adjusted between -40° and 40°;

[0071] A multi - coordinate pneumatic probe calibration test bench provided in this embodiment. To avoid interference, the adjustment of the angle of attack and the pitch angle are both achieved through the bottom turntable 12. The angles that the angle of attack and the pitch angle need to rotate are relatively small. Therefore, it is not easy for the housing 3 on the bottom turntable 12 to interfere with the calibration wind tunnel outlet 1, and the position of the workbench 15 relative to the calibration wind tunnel outlet 1 is easier to be adjusted in place;

[0072] Figure 15 and Figure 16 are respectively the working schematic diagrams of a multi - coordinate pneumatic probe calibration test bench when the pitch angle is 60° and the sideslip angle is 40° (60° and 40° are respectively the maximum angles that the bottom turntable 12 and the sideslip angle turntable 8 need to rotate during calibration). The tester can move the workbench 15 to align the center hole of the gear ring 4 on the housing 3 with the calibration wind tunnel outlet 1 to avoid interference. In this embodiment, the axis of the calibration wind tunnel outlet 1 coincides with the axis of the center hole of the gear ring 4 in the initial state as shown in Figure 1 shown.

[0073] Embodiment 2

[0074] The working principle and main structure of a multi - coordinate pneumatic probe calibration test bench provided in this embodiment are the same as those in Embodiment 1. The difference in its structure from Embodiment 1 lies in the following point:

[0075] In Embodiment 1, the probe clamping mechanism is used for fixing the L - shaped probe. The probe clamping mechanism includes a fixture adapter plate 6, an L - shaped probe fixture 13, and an L - shaped probe adapter block 18;

[0076] The L - shaped probe adapter block 18 is fixed on the gear ring 4. The fixture adapter plate 6 is provided with an oblong hole 61 for connecting with the L - shaped probe adapter block 18 and a bolt hole 62 for connecting with the L - shaped probe fixture 13. The L - shaped probe fixture 13 can clamp the strut 52 of the probe 5.

[0077] In this embodiment, the probe clamping mechanism is used for fixing the straight probe as shown in Figure 13 shown. As shown in Figure 4 , Figure 5 , Figure 7 and Figure 8 shown, the probe clamping mechanism includes a fixture support rod 16, a straight probe fixture 17, and a straight probe adapter block 19;

[0078] The straight probe adapter block 19 is fixed on the gear ring 4. One end of the fixture support rod 16 is fixed to the straight probe adapter block 19, and the other end of the fixture support rod 16 is fixed to the straight probe fixture 17. The straight probe fixture 17 is used for clamping the straight probe;

[0079] On one side of the fixture support rod 16 close to the calibration wind tunnel outlet 1, there is a first inclined surface 161, and on one side of the straight probe fixture 17 close to the calibration wind tunnel outlet 1, there is a second inclined surface 171;

[0080] The fixture support rod 16 and the straight probe fixture 17 inevitably exist in the mainstream area. By reducing the windward area of the fixture support rod 16 and the straight probe fixture 17 (while reducing the windward area, increasing the thickness to ensure the cross-sectional area and thus ensure the structural strength), the generation of turbulence can be reduced;

[0081] In this embodiment, as Figure 14 shown, the first inclined surfaces 161 are symmetrically arranged on the fixture support rod 16 for reducing wind resistance, and the second inclined surfaces 171 are symmetrically arranged on the straight probe fixture 17 for reducing wind resistance.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi - coordinate system pneumatic probe calibration test bench, characterized in that, Comprising: A probe clamping mechanism, an azimuth rotation mechanism, a sideslip angle turntable (8) and a bottom turntable (12), wherein the rotation centerlines of the azimuth rotation mechanism, the sideslip angle turntable (8) and the bottom turntable (12) are perpendicular to each other; The rotation centerline of the bottom turntable (12) is perpendicular to the horizontal plane, the sideslip angle turntable (8) is installed on the bottom turntable (12), and the azimuth rotation mechanism is installed on the sideslip angle turntable (8); The azimuth rotation mechanism includes a gear ring (4) and a motor (7) for driving the gear ring (4) to rotate. The axis of the gear ring (4) coincides with the rotation centerline of the azimuth rotation mechanism, and the probe clamping mechanism is fixed on the gear ring (4); When the probe (5) is clamped and fixed on the probe clamping mechanism, the probe head (51) of the probe (5) is located on the axis of the gear ring (4); The azimuth rotation mechanism further includes a housing (3), and the gear ring (4) can rotate within the housing (3); The motor (7) is fixed on the housing (3), and a gear (14) is fixed on the output shaft of the motor (7). The gear (14) meshes with the gear ring (4); A rotating bottom plate (11) is fixed on the rotating disk of the bottom turntable (12). Oppositely arranged first brackets (2) and second brackets (9) are fixed on the rotating bottom plate (11). A rotating shaft (22) is provided at the top of the first bracket (2), and the top of the second bracket (9) is fixedly connected to the sideslip angle turntable (8). Two ends of the housing (3) are respectively fixedly connected to the rotating shaft (22) and the rotating disk of the sideslip angle turntable (8).

2. The multi - coordinate system pneumatic probe calibration test bench according to claim 1, characterized in that, It further includes a slideway (20) and a ball (21); Slideways (20) are provided on both sides of the gear ring (4). The slideways (20) are fixed within the housing (3). Grooves are provided on the opposite surfaces of the gear ring (4) and the slideways (20). The ball (21) is located between the gear ring (4) and the slideways (20), and the ball (21) can roll within the grooves.

3. The multi - coordinate system pneumatic probe calibration test bench according to claim 1, characterized in that, The gear ring (4) is an external gear ring.

4. The multi - coordinate system pneumatic probe calibration test bench according to claim 1, characterized in that, The probe clamping mechanism includes a fixture adapter plate (6), an L-shaped probe fixture (13) and an L-shaped probe adapter block (18); The L-shaped probe adapter block (18) is fixed on the gear ring (4). The fixture adapter plate (6) is provided with an oblong hole (61) for connecting with the L-shaped probe adapter block (18) and a bolt hole (62) for connecting with the L-shaped probe fixture (13). The L-shaped probe fixture (13) can clamp the rod (52) of the probe (5).

5. The multi - coordinate system pneumatic probe calibration test bench according to claim 1, characterized in that, The probe clamping mechanism includes a fixture support rod (16), a straight probe fixture (17) and a straight probe adapter block (19); The straight probe adapter block (19) is fixed on the gear ring (4). One end of the fixture support rod (16) is fixedly connected to the straight probe adapter block (19), and the other end of the fixture support rod (16) is fixedly connected to the straight probe fixture (17).

6. The multi - coordinate system pneumatic probe calibration test bench according to claim 5, characterized in that, A first inclined surface (161) is provided on one side of the fixture support rod (16) close to the calibration wind tunnel outlet (1), and a second inclined surface (171) is provided on one side of the straight probe fixture (17) close to the calibration wind tunnel outlet (1).

7. The multi - coordinate system pneumatic probe calibration test bench according to claim 1, characterized in that, Reinforcing rib plates (10) are fixed on both the first bracket (2) and the second bracket (9).

8. The multi - coordinate system pneumatic probe calibration test bench according to claim 1, characterized in that, It further includes a workbench (15), and the bottom turntable (12) is fixed on the workbench (15).

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