A device for measuring sideslip angle of a wind tunnel test section model

Abstract

The present invention provides a device for measuring the sideslip angle of a wind tunnel test section model, comprising a wind tunnel test section schematic and a model, a measuring assembly, a first bracket assembly, and a second bracket assembly arranged in sequence from top to bottom in the wind tunnel test section schematic; the model is connected to the measuring assembly, the measuring assembly is arranged on the top of the first bracket assembly, the first bracket assembly is arranged on the top of the second bracket assembly, and the two are arranged vertically; both ends of the second bracket assembly are mounted in the wind tunnel test section schematic. The present invention measures the left and right offsets of the head and tail of the model through the measuring assembly, and simultaneously measures the distance between the head and tail measurement points of the model, thereby calculating the accurate measurement angle of the model. The present invention can be used in a device for measuring the sideslip angle of a wind tunnel model, realizes the accurate measurement of the sideslip angle of a wind tunnel model, and can be widely used in wind tunnel tests.

Description

Technical Field

[0001] The invention relates to the technical field of experimental aerodynamics, in particular to a device for measuring the sideslip angle of a wind tunnel test section model. Background Art

[0002] Wind tunnel testing is an aerodynamic test that requires extremely high precision. It involves numerous technical steps, including model design, processing, and installation, wind tunnel flow field quality, automatic control systems, measurement systems, and data acquisition and processing systems. During model installation, it is necessary to measure the model's attitude angles, such as pitch and sideslip angles.

[0003] Existing methods for measuring sideslip angles primarily rely on height gauges or plate rulers, which suffer from poor accuracy. With the development of aerospace, specialized wind tunnel tests are becoming increasingly common, requiring even higher precision in sideslip angle measurements for model installations. Conventional attitude angle measurement methods are clearly inadequate. Therefore, a sideslip angle measurement device that is both easy to use and highly accurate is urgently needed. Summary of the Invention

[0004] Aiming at special wind tunnel tests, a sideslip angle measuring device with easy operation and high measurement accuracy is provided.

[0005] The technical solution of the present invention is: a wind tunnel test section model sideslip angle measurement device, including a wind tunnel test section schematic and a model, a measurement component, a first bracket component and a second bracket component arranged in sequence from top to bottom in the wind tunnel test section schematic; the model is connected to the measurement component, the measurement component is arranged on the top of the first bracket component, the first bracket component is arranged on the top of the second bracket component, and the two are arranged vertically; the two ends of the second bracket component are mounted in the wind tunnel test section schematic.

[0006] Preferably, the measuring assembly comprises: a measuring head and a measuring head base, the measuring head contacts the model, the measuring head base is connected to the first bracket assembly, and the measuring head is rotatably connected to the measuring head base.

[0007] Preferably, the measuring head includes: a support plate and a support column, the support plate is in contact with the model, and a V-shaped groove is provided on the support plate for placing the model, and the support column is a hollow cylindrical structure and is connected to the measuring head base.

[0008] Preferably, a threaded hole is formed on a side surface of the support column, and the third locking screw passes through the threaded hole to be connected to the measuring head.

[0009] Preferably, the measuring head is fixedly connected to the measuring head base via a third locking screw.

[0010] Preferably, the first bracket assembly includes: a first slide, a first bracket, a first level bubble, a first fixed block, a first fine-tuning screw and a first locking screw; the first slide is passed through the first bracket and is slidably connected to the first bracket, the first fixed block is passed through the first bracket and is connected to the first slide; the first fixed block is connected to the first bracket through the first locking screw, and the first fixed block is connected to the first slide through the first fine-tuning screw; the first level bubble is arranged on the top of the first bracket for judging whether the first bracket is level.

[0011] Preferably, a threaded hole is provided on the end surface of the first slide seat close to the first fixed block, and the clamping pin is fixed to the first slide seat through the threaded hole; a through hole is provided inside the clamping pin, and the diameter of the through hole is larger than the outer diameter of the threaded end of the first fine-tuning screw; the first fine-tuning screw passes through the clamping pin, and the clamping nut is screwed into the end of the first fine-tuning screw to limit the first fine-tuning screw, and the outer diameter of the clamping nut is smaller than the diameter of the threaded hole of the first slide seat.

[0012] Preferably, the second bracket assembly includes: a second slide, a second bracket, a second level bubble, a second fixed block, a second fine-tuning screw and a second locking screw; the second slide is passed through the second bracket and is slidably connected to the second bracket, and the second fixed block is passed through the second bracket and is connected to the second slide; the second fixed block is connected to the second bracket through the second locking screw, and the second fixed block is connected to the second slide through the second fine-tuning screw; the second level bubble is arranged on the top of the second bracket for judging whether the second bracket is level.

[0013] Preferably, the second slide seat is provided with a reinforcing rib, and the reinforcing rib is fixed to the first bracket by screws.

[0014] Preferably, a second bracket seat is provided at one end of the second bracket and is connected to the second bracket via a second bracket screw.

[0015] Compared with the existing technology, the beneficial effects of the present invention are: it can be fixed in the wind tunnel to complete the accurate measurement of the sideslip angle of the model; vertical installation can measure the pitch angle of the model; the structural design is reliable and has good adaptability to the model; it is small in size, easy to carry, simple to operate, and has accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of a side slip angle measurement device for a wind tunnel test section model according to an embodiment of the present invention;

[0018] Figure 2 This is a partial cross-sectional view of a side slip angle measurement device for a wind tunnel test section model according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of an angle calculation method for a side slip angle measurement device for a wind tunnel test section model according to an embodiment of the present invention;

[0020] Figure 4 This is another angle calculation schematic diagram of the sideslip angle measurement device for the wind tunnel test section model according to an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1: Schematic diagram of the wind tunnel test section; 2: Measuring head; 3: First level bubble; 4: First fixed block; 5: First slide; 6: First locking screw; 7: Second fine-tuning screw; 8: Second bracket; 9: Second locking screw; 10: Second fixed block; 11: First bracket; 12: Model; 13: Measuring head base; 14: Second slide; 15: Second level bubble; 16: Second bracket screw; 17: Second bracket base; 18: Limit screw; 19: Third locking screw; 20: Holding pin; 21: Holding nut; 22: First fine-tuning screw. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0026] like Figures 1 to 4 As shown, the present invention provides a device for measuring the sideslip angle of a wind tunnel test section model, comprising a wind tunnel test section schematic 1, and a model 12, a measurement assembly, a first bracket assembly, and a second bracket assembly, arranged in order from top to bottom within the wind tunnel test section schematic 1. Model 12 is connected to the measurement assembly, which is positioned on top of the first bracket assembly, which is positioned on top of the second bracket assembly, with the two brackets arranged perpendicularly. The second bracket assembly is mounted at both ends within the wind tunnel test section schematic 1.

[0027] In some preferred embodiments, the measurement assembly includes a measuring head 2 and a measuring head base 13. The measuring head 2 contacts the model 12, and the measuring head base 13 is connected to the first bracket assembly. The measuring head 2 is rotatably mounted on the measuring head base 13. The measuring head 2 includes a support plate and a support column. The support plate contacts the model 12 and is provided with a V-shaped groove for positioning the model 12. The V-shaped groove contacts the model 12. When measuring the tail of the model 12, the inclined surface of the V-shaped groove is tangent to the outer circle of the model 12. When measuring the head of the model 12, the apex of the V-shaped groove coincides with the apex of the head of the model 12. The support column is a hollow cylindrical structure and is connected to the measuring head base 13. A threaded hole is provided on the side of the support column, through which a third locking screw 19 is passed to connect to the measuring head 2. The measuring head 2 is fixedly connected to the measuring head base 13 via the third locking screw 19. The measuring head 2 measures the lateral offset of the head and tail of the model 12 and the length of the model 12, and the sideslip angle of the model 12 can be calculated.

[0028] In some preferred embodiments, the first bracket assembly includes: a first slide 5, a first bracket 11, a first leveling bubble 3, a first fixing block 4, a first fine-tuning screw 22, and a first locking screw 6. The first slide 5 is inserted into the first bracket 11 and is slidably connected to the first bracket 11. The first fixing block 4 is inserted into the first bracket 11 and is connected to the first slide 5. The first fixing block 4 is connected to the first bracket 11 via the first locking screw 6, and the first fixing block 4 is connected to the first slide 5 via the first fine-tuning screw 22. The first leveling bubble 3 is provided at the top of the first bracket 11 and is used to determine whether the first bracket 11 is level. For example, a scale is provided on the upper surface of the first bracket 11.

[0029] The end surface of the first slide 5 proximal to the first fixing block 4 is provided with a threaded hole, through which the clamping pin 20 is secured to the first slide 5. The clamping pin 20 has a through-hole internally formed, the diameter of which is larger than the outer diameter of the threaded end of the first fine-tuning screw 22. The first fine-tuning screw 22 passes through the clamping pin 20, and a clamping nut 21 is screwed into the end of the first fine-tuning screw 22 to retain the screw 22 in position. The outer diameter of the clamping nut 21 is smaller than the diameter of the threaded hole in the first slide 5.

[0030] The measuring head base 13 is screwed onto the first slide 5. It features a cylindrical structure that mates with the support column. The first slide 5 can slide along the first bracket 11. The first fixing block 4 is mounted on the first bracket 11 and can slide along the first bracket 11. Limit screws 18 are provided at both ends of the first bracket 11 to limit the position of the first slide 5. The cross-section of the first bracket 11 is trapezoidal or rectangular, corresponding to the cross-sectional shape of the inner hole of the first slide 5.

[0031] In some preferred embodiments, the second bracket assembly includes: a second slide 14, a second bracket 8, a second leveling bubble 15, a second fixed block 10, a second fine-tuning screw 7, and a second locking screw 9. The second slide 14 is inserted through the second bracket 8 and slidably connected thereto. The second fixed block 10 is inserted through the second bracket 8 and connected to the second slide 14. The second fixed block 10 is connected to the second bracket 8 via the second locking screw 9, and the second fixed block 10 is connected to the second slide 14 via the second fine-tuning screw 7. The second leveling bubble 15 is disposed at the top of the second bracket 8 and is used to determine whether the second bracket 8 is level. The first bracket 11 is provided with a screw hole and is connected to the second slide 14 via a screw. The first bracket 11 can slide along the second bracket 8. The upper surface of the second bracket 8 is provided with a scale. When the second bracket 8 is mounted horizontally, the sideslip angle of the model 12 can be measured. When mounted vertically, the pitch angle of the model 12 can be measured.

[0032] In some preferred embodiments, second slide 14 is provided with reinforcing ribs, which are secured to first bracket 11 via screws. A second bracket seat 17 is provided at one end of second bracket 8 and is connected to second bracket 8 via second bracket screw 16. The threads at both ends of second bracket screw 16 have opposite rotation directions, and the mating threads of second bracket 8 and second bracket seat 17 are determined by the thread rotation direction of second bracket screw 16.

[0033] The second bracket 8 is an elongated structure with a trapezoidal or rectangular cross-section. A platform is provided at the point of contact with the wind tunnel wall. The end that mounts to the second bracket screw 16 is threaded, engaging the screw 16. The second leveling bulb 15 is embedded within the second bracket 8 and does not protrude from the surface. The cross-sectional shape of the second slide 14 and the second fixed block 10 in the contact section with the second bracket 8 is determined by the cross-sectional shape of the second bracket 8, allowing them to slide along the second bracket 8.

[0034] A platform is provided at the position where the second bracket seat 17 contacts the cave wall. The shape of the platform is determined according to the shape of the test section. When the cross-section of the test section is circular, the bottom of the platform is arc-shaped; when the cross-section of the test section is rectangular, the bottom of the platform is flat.

[0035] The operating principle of the present invention is as follows: Place the device in the wind tunnel test section. Adjust second bracket screw 16 to open second bracket 8 and second bracket seat 17. Simultaneously, observe first level bubble 3 and second level bubble 15 to ensure that first bracket 11 and second bracket 8 are parallel to the ground. Tighten second bracket screw 16 to secure the device to the wind tunnel test section.

[0036] Adjust the first slide 5 and the second slide 14 so that the bottom of the V-groove of the measuring head 2 is aligned with the head of the model 12, thereby measuring the position of the head of the model 12, and reading the reading L1 of the end face of the first slide 5 on the first bracket 11 at this time, and reading the reading D1 of the end face of the second slide 14 on the second bracket 8 (as shown in the figure). Figure 3 Then adjust the first slide 5 and the second slide 14, loosen the third locking screw 19, rotate the measuring head 2 so that the V-groove axis of the measuring head 2 coincides with the axis of the model 12, measure the position of the straight section at the tail of the model 12, and read the reading L2 of the end face of the first slide 5 on the first bracket 11 and the reading D2 of the end face of the second slide 14 on the second bracket 8 (as shown). Figure 4 Then, the sideslip angle of model 12 is a=arctan[(D2-D1) / (L1-L2)].

[0037] When adjusting the first slide 5, the first fixing block 4 can be fixed, and the first fine-tuning screw 22 can be adjusted to fine-tune the first slide 5 on the first bracket 11. When adjusting the second slide 14, the second fixing block 10 can be fixed, and the second fine-tuning screw 7 can be adjusted to fine-tune the second slide 14 on the first bracket 11.

[0038] If the second bracket 8 is vertically installed inside the wind tunnel, the pitch angle of the model 12 can be measured.

[0039] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring the sideslip angle of a wind tunnel test section model, characterized in that: The invention comprises a schematic diagram of a wind tunnel test section and a model, a measurement assembly, a first bracket assembly, and a second bracket assembly arranged in sequence from top to bottom in the schematic diagram of the wind tunnel test section; the model is connected to the measurement assembly, the measurement assembly is arranged on top of the first bracket assembly, and the first bracket assembly is arranged on top of the second bracket assembly, and the two are arranged vertically; The two ends of the second bracket assembly are mounted in the wind tunnel test section diagram. The measurement assembly includes a measuring head and a measuring head base. The measuring head base is connected to the first bracket assembly, and the measuring head is rotatably connected to the measuring head base. The measuring head includes a support plate and a support column. The support plate contacts the model and has a V-shaped groove on the support plate for placing the model. The support column is a hollow cylindrical structure and is connected to the measuring head base. The side of the support column has a threaded hole, and a third locking screw is passed through the threaded hole to connect to the measuring head. The first bracket assembly includes: a first slide, a first bracket, a first level bubble, a first fixing block, a first fine-adjustment screw, and a first locking screw; the first slide is disposed on the first bracket and is slidably connected to the first bracket, and the first fixing block is disposed on the first bracket and is connected to the first slide; The second bracket assembly includes: a second slide, a second bracket, a second level bubble, a second fixing block, a second fine-adjustment screw, and a second locking screw; the second slide is inserted into the second bracket and slidably connected to the second bracket, and the second fixing block is inserted into the second bracket and connected to the second slide; a screw hole is provided in the first bracket, which is connected to the second slide via the screw, so that the first bracket can slide along the second bracket; Adjust the first and second slides so that the bottom of the V-groove of the measuring head is aligned with the head of the model, thereby measuring the position of the model head and reading L1 of the first slide end face on the first bracket and D1 of the second slide end face on the second bracket. Next, adjust the first and second slides while loosening the third locking screw. Rotate the measuring head so that the axis of the V-groove of the measuring head coincides with the axis of the model. Measure the position of the straight section at the tail of the model and read L2 of the first slide end face on the first bracket and D2 of the second slide end face on the second bracket. The sideslip angle of the model is a = arctan[(D2-D1) / (L1-L2)].

2. The device for measuring sideslip angle of a wind tunnel test section model according to claim 1, characterized in that: The measuring head is fixedly connected to the measuring head base via a third locking screw.

3. The device for measuring sideslip angle of a wind tunnel test section model according to claim 1, characterized in that: The first fixing block is connected to the first bracket through a first locking screw, and the first fixing block is connected to the first slide seat through a first fine-tuning screw; a first level bubble is set on the top of the first bracket to determine whether the first bracket is level.

4. The device for measuring sideslip angle of a wind tunnel test section model according to claim 3, characterized in that: A threaded hole is provided on the end face of the first slide seat close to the first fixed block, and the clamping pin is fixed to the first slide seat through the threaded hole; a through hole is provided inside the clamping pin, and the diameter of the through hole is larger than the outer diameter of the threaded end of the first fine-tuning screw; the first fine-tuning screw passes through the clamping pin, and the clamping nut is screwed into the end of the first fine-tuning screw to limit the first fine-tuning screw, and the outer diameter of the clamping nut is smaller than the diameter of the threaded hole of the first slide seat.

5. The device for measuring sideslip angle of a wind tunnel test section model according to claim 3, characterized in that: The second fixing block is connected to the second bracket through a second locking screw, and the second fixing block is connected to the second slide seat through a second fine-tuning screw; the second level bubble is set on the top of the second bracket to determine whether the second bracket is level.

6. The device for measuring sideslip angle of a wind tunnel test section model according to claim 5, characterized in that: The second sliding seat is provided with a reinforcing rib, and the reinforcing rib is fixed to the first bracket by screws.

7. The device for measuring sideslip angle of a wind tunnel test section model according to claim 6, characterized in that: A second bracket seat is provided at one end of the second bracket and is connected to the second bracket via a second bracket screw.

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