Forward air door adjusting mechanism and wind tunnel

Abstract

The invention discloses a forward air door adjusting mechanism and a wind tunnel, and the mechanism comprises an adjusting main body which is rotatably connected with a fixed part, and the fixed part is used for being connected to a wind hole; the supporting piece is arranged on the adjusting main body; one end of the transmission component is connected with the supporting piece, and the other end is connected with a spindle; the driving device is connected with the main shaft; under driving of the driving device, the transmission component drives the supporting piece so that the adjusting body can rotate to be close to or away from the inner wall of the air hole with the fixing piece as the rotating axis, and the air outlet area of the air hole can be adjusted. When the adjusting body rotates to approach the inner wall of the air hole, the effective circulation area of the air outlet is reduced; when the adjusting body rotates to be far away from the inner wall of the wind hole, the area of the air outlet is recovered or increased, the output wind speed can be remarkably increased by reducing the area of the air outlet under the condition that the power of the wind tunnel airflow generating device is not changed, the high-wind-speed test requirement exceeding the design upper limit is met, and the limitation of a fixed structure on the wind tunnel test capacity is thoroughly broken through.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of jet wind tunnels, and particularly relates to a positive air door adjusting mechanism and a wind tunnel. BACKGROUND

[0002] As a core device for carrying out aerodynamic performance tests in the field of aerospace, a jet wind tunnel generates a controllable airflow field to simulate airflow movement states under different working conditions, and provides key test data for aerodynamic layout optimization performance evaluation research of an aircraft. In the design and application of jet wind tunnels and open wind tunnels, the structural design of an air outlet directly affects the controllability of flow field quality and test parameters. Therefore, ensuring the uniformity and stability of airflow at the air outlet has been one of the core objectives of wind tunnel design. At present, in order to pursue the stability of flow field quality, the air outlet of the domestic mainstream jet wind tunnel and open wind tunnel generally adopts a fixed-size structural design. This design matches the airflow generating device and the flow regulating device inside the wind tunnel with the preset air outlet area, so that a stable airflow output can be formed within the design parameter range, and the basic demand for airflow stability in conventional tests can be met. However, this fixed air outlet area design scheme has significant functional limitations. Since the air outlet area is constant, when the power of the airflow generating device of the wind tunnel reaches the design upper limit, the wind speed output by the wind tunnel will be limited within a fixed threshold, and it is impossible to further improve.

[0003] In actual scientific research and engineering tests, as the research field expands and the test demand upgrades, more and more scenarios need to simulate high wind speed working conditions exceeding the design upper limit. The existing fixed air outlet structure cannot break through the limitation of the wind speed upper limit, and thus cannot meet the high wind speed test demand, which limits the application range of the wind tunnel device and cannot fully exert its test capacity. At the same time, if a special wind tunnel is designed and built to realize the high wind speed demand, the equipment cost and construction period will be greatly increased, causing resource waste. SUMMARY The application provides a positive air door adjusting mechanism and a wind tunnel, which are used to solve the technical defects in the prior art that the existing fixed air outlet structure cannot break through the limitation of the wind speed upper limit, cannot meet the high wind speed test demand, and limits the application range of the wind tunnel device and cannot fully exert its test capacity. In order to achieve the above-mentioned purpose, the following technical scheme is adopted in the application: In a first aspect, a positive air door adjusting mechanism is provided, comprising: An adjusting body, a fixing member is rotatably connected to the adjusting body, and the fixing member is used to be connected at a wind tunnel opening; A support member is arranged on the adjusting body; A transmission member is connected at one end to the support member and at the other end to a main shaft; A driving device is connected to the main shaft; Driven by the drive device, the transmission component drives the support component to make the adjustment body rotate around the fixed component as the rotation axis, moving closer to or away from the inner wall of the wind tunnel opening, so as to adjust the air outlet area of ​​the wind tunnel opening.

[0004] Furthermore, multiple support members are provided, and the multiple support members are spaced apart along the entire length of the adjusting body; Each of the aforementioned support members has a transmission component at its end.

[0005] Furthermore, the support member includes a connecting part and a supporting part, wherein the connecting part and the supporting part are integrally formed; The connecting part is connected to the adjusting body, and the supporting part is connected to the transmission component.

[0006] Furthermore, the connecting part is a plate-like structure, and the supporting part is a structure with one end open and the other end closed; The open end of the support is disposed on the plate-shaped structure, and the closed end of the support is connected to the transmission component.

[0007] Furthermore, the adjustment body is a door panel.

[0008] Furthermore, the door panel has a rectangular structure.

[0009] Furthermore, the transmission component is a crank.

[0010] Furthermore, the drive device includes a drive unit and a reduction unit, and the drive unit is connected to the main shaft through the reduction unit.

[0011] Furthermore, the drive unit is a motor, and the reduction unit is a speed reducer.

[0012] Secondly, a wind tunnel is provided, including a wind tunnel body, wherein a forward damper adjustment mechanism as described above is installed at the opening of the wind tunnel body.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The drive unit drives the main shaft to rotate, and the main shaft transmits power to the support through the transmission component, which in turn drives the adjustment body to rotate around the fixed part as the rotation axis. When the adjustment body rotates closer to the inner wall of the wind tunnel opening, the effective flow area of ​​the air outlet decreases; when the adjustment body rotates away from the inner wall of the wind tunnel opening, the air outlet area recovers or increases. The whole process is based on the principle in fluid mechanics that when the flow rate is constant, the cross-sectional area is inversely proportional to the flow velocity. By reducing the air outlet area, the output wind speed can be significantly increased without changing the power of the wind tunnel airflow generating device, meeting the high wind speed test requirements beyond the design limit, and completely breaking the limitation of the fixed structure on the wind tunnel test capability.

[0014] 2. A single support component can easily lead to stress concentration in a local area. When driving the adjustment body to rotate, uneven torque can cause deformation such as bending and twisting, which not only affects the adjustment accuracy but may also shorten the service life of the component due to long-term stress concentration. However, multiple support components are arranged at intervals along the entire length of the adjustment body, which can evenly distribute the driving force transmitted by the transmission components to multiple points of the adjustment body, so that the stress on each section of the adjustment body tends to be balanced during the rotation process, effectively reducing the peak value of local stress.

[0015] 3. The integrated structural design of the connecting part and the support part eliminates the weak nodes of the separate connection, making the support part a continuous rigid whole. Whether it is transmitting the driving force of the transmission component or bearing the reaction force of the airflow impact, the integrated structure can evenly distribute the load to the entire support part, effectively avoid local stress concentration, significantly improve the structural reliability and fatigue life of the support part, and ensure stable operation under harsh working conditions such as high frequency adjustment and high wind speed impact.

[0016] 4. The plate-like structure has a larger contact area with the main body of the adjustment, which can form a more stable connection interface, effectively disperse the load transmitted by the main body of the adjustment, and avoid deformation or detachment of the connection point due to excessive local contact pressure.

[0017] 5. The air outlet of the jet wind tunnel is mostly a regular plane such as a rectangle or circle, and the door panel, as the main adjustment body, can form a good fit with the air outlet. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A top view of the installation of the support member and the adjustment body in a positive damper adjustment mechanism provided by the present invention; Figure 2 This invention provides a schematic diagram of the assembly of the support component and the transmission component in a forward damper adjustment mechanism; Figure 3 This invention provides a schematic diagram of the assembly of the transmission component and the main shaft in a forward damper adjustment mechanism; Figure 4 A side view of the assembly of the support member and the adjustment body in a positive damper adjustment mechanism provided by the present invention; The components include: 1. Transmission components; 2. Adjustment body; 3. Fixing components; 4. Supporting components; 5. Main shaft; 6. Frame. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: See Figures 1-4The first aspect of the present invention provides a forward damper adjustment mechanism, comprising: an adjustment body 2, on which a fixing member 3 is rotatably connected, the fixing member 3 being used to connect to the wind tunnel opening; a support member 4 disposed on the adjustment body 2; a transmission member 1, one end of which is connected to the support member 4, and the other end of which is connected to a main shaft 5; and a drive device connected to the main shaft 5; wherein, under the drive of the drive device, the transmission member 1 drives the support member 4 to cause the adjustment body 2 to rotate around the fixing member 3 as the rotation axis, moving closer to or away from the inner wall of the wind tunnel opening, so as to adjust the air outlet area of ​​the wind tunnel opening.

[0027] In the above structure, the drive device drives the main shaft 5 to rotate, and the main shaft 5 transmits power to the support member 4 through the transmission member 1, thereby driving the adjustment body 2 to rotate around the fixed member 3 as the rotation axis. When the adjustment body 2 rotates closer to the inner wall of the wind tunnel opening, the effective flow area of ​​the air outlet decreases. When the adjustment body 2 rotates away from the inner wall of the wind tunnel opening, the air outlet area recovers or increases. This design directly addresses the defect of the existing fixed air outlet area being constant, which prevents the wind speed from exceeding the upper limit. Based on the principle in fluid mechanics that when the flow rate is constant, the cross-sectional area is inversely proportional to the flow velocity, by reducing the air outlet area, the output wind speed can be significantly increased without changing the power of the wind tunnel airflow generating device, meeting the high wind speed test requirements beyond the design upper limit, and completely breaking the limitation of fixed structure on wind tunnel test capabilities. Secondly, during the process of adjusting the area of ​​the air outlet using the above scheme, the adjusting body 2 rotates regularly around the fixed part 3 as the rotation axis, and the movement trajectory is controllable, avoiding airflow disturbance caused by shaking during the adjustment process; at the same time, the synergistic effect of the support part 4 and the transmission component 1 makes the adjusting body 2 uniformly stressed, which can achieve slow and stable angle adjustment and prevent airflow impact caused by sudden changes in area; in addition, the adjusting body 2 always maintains a reasonable fit with the inner wall of the wind tunnel opening when rotating, reducing the generation of airflow eddies, and ensuring that the uniformity and stability of the airflow can still be maintained while changing the area of ​​the air outlet, thus meeting the core requirements of wind tunnel tests for a high-quality flow field. During installation, the regulating mechanism is directly connected to the wind tunnel inlet via the fixing component 3, eliminating the need for large-scale modifications to the wind tunnel itself and demonstrating strong adaptability. On one hand, the connection method of the fixing component 3 can be flexibly designed according to the installation environment of the wind tunnel inlet, making it suitable for jet wind tunnels of different models and construction standards. On the other hand, the size and number of the regulating body 2 can be configured according to the size of the air outlet. For large air outlets, multiple regulating bodies 2 can be set up to work collaboratively, further improving the accuracy of area control. This allows existing wind tunnels to be upgraded to adjustable wind speed equipment without the need for scrapping and rebuilding, significantly reducing equipment upgrade costs and solving the pain point of "high cost and long cycle of rebuilding a dedicated wind tunnel." The drive unit provides stable power through the main shaft 5, and the transmission component 1 accurately transmits the rotational motion to the support component 4 to avoid power loss or transmission deviation. The support component 4 is fixed on the adjustment body 2, which can distribute the force when the adjustment body 2 rotates and prevent excessive local stress from causing component deformation.

[0028] In summary, this forward damper adjustment mechanism, through its controllable adjustment, stable adaptation, and efficient and reliable design, not only solves the functional limitations of existing fixed air outlets, but also takes into account flow field quality, equipment compatibility, and economy, providing a practical and feasible technical solution for the performance upgrade of jet wind tunnels and open wind tunnels.

[0029] like Figure 3 As shown, there are multiple support members 4, which are spaced apart along the length of the adjusting body 2, and each support member 4 has a transmission component 1 at its end.

[0030] For the wide air outlet of a large wind tunnel, a relatively long adjustment body 2 is required for adjustment. A single support member 4 is prone to causing stress concentration in a local area. When driving the adjustment body 2 to rotate, uneven torque can cause deformation such as bending and twisting, which not only affects the adjustment accuracy but may also shorten the service life of the component due to long-term stress concentration. However, multiple support members 4 are arranged at intervals along the entire length of the adjustment body 2, which can evenly distribute the driving force transmitted by the transmission member 1 to multiple points of the adjustment body 2, so that the force on each section of the adjustment body 2 tends to be balanced during rotation, effectively reducing local stress peaks. At the same time, each support member 4 receives power through an independent transmission member 1, avoiding the overall adjustment failure caused by the failure of a single transmission path, greatly improving the structural reliability of the mechanism, and ensuring that the adjustment body 2 can maintain structural stability even under high-frequency and high-load adjustment conditions. Furthermore, wind tunnel tests require extremely high precision in adjusting the outlet area. Even slight adjustment deviations can lead to uneven airflow velocity, affecting the accuracy of test data. The coordinated design of multiple support components 4 and corresponding transmission components 1 improves adjustment precision through a "multi-point synchronous drive" mechanism. When the drive device drives the main shaft 5 to rotate, the main shaft 5 simultaneously drives each transmission component 1 to move, and each transmission component 1 pushes the adjustment body 2 to rotate through its corresponding support component 4.

[0031] Since the support member 4 is set at intervals along the entire length, it can form multi-point constraints on the rotation trajectory of the adjustment body 2, avoiding problems such as offset or skew during the rotation of the adjustment body 2, ensuring that it always rotates regularly with the fixed member 3 as the axis, so that the angle adjustment accuracy of the adjustment body 2 can be controlled within a smaller range, thereby achieving precise control of the air outlet area and ensuring the stability of the flow field quality under different wind speed conditions. Furthermore, such as Figure 2As shown, the support member 4 has a triangular structure, including a connecting part and a supporting part. The connecting part and the supporting part are an integral structure. The connecting part is connected to the adjusting body 2, and the supporting part is connected to the transmission component 1.

[0032] During operation, the support component 4 needs to bear both the driving force transmitted by the transmission component 1 and the reaction force of the airflow impact. The triangular structure can evenly distribute these complex loads along the three sides to the entire support component 4, avoiding local stress concentration.

[0033] In addition, the connecting part is welded and fixed to the adjusting body 2, eliminating the assembly gap of the split structure.

[0034] In implementation, the connecting part is a plate-like structure, and the supporting part is a structure with one open end and one closed end. The open end of the supporting part is set on the plate-like structure, and the closed end of the supporting part is connected to the transmission component 1. The plate-like structure has a larger contact area with the adjusting body 2, which can form a more stable connection interface, effectively dispersing the load transmitted by the adjusting body 2 and avoiding deformation or detachment of the connection point due to excessive local contact pressure. Secondly, the plate-like structure itself has high bending and torsional strength. When subjected to the driving force transmitted by the supporting part or the reaction force of airflow impact, it is not easy to bend or twist, which can stably transmit the load and provide a reliable force foundation for the supporting part. This fundamentally improves the connection stability between the supporting component 4 and the adjusting body 2, ensuring that the connection does not fail under harsh working conditions. In this design, the main body 2 is a door panel with a rectangular structure, and the fasteners 3 are located at both ends on one side of the main body 2; specifically, the fasteners 3 are hinges.

[0035] In this scheme, the transmission component 1 is a crank. When the adjustment body 2 is closed, the transmission component 1 and the support 4 form an obtuse angle. When the drive device is driven, it drives the main shaft 5 to rotate. The main shaft 5 drives the transmission component 1. Since the support 4 is fixed on the adjustment body 2, and the adjustment body 2 is connected to the air outlet of the wind tunnel through a hinge, the adjustment body 2 will rotate towards the inside of the air outlet (that is, the inner wall of the wind tunnel) with the connection between the hinge and the air outlet as the axis, thereby achieving the purpose of reducing the area of ​​the air outlet.

[0036] Furthermore, the drive device includes a drive unit and a reduction unit, with the drive unit connected to the main shaft 5 via the reduction unit. The drive unit is a motor, and the reduction unit is a speed reducer. While the motor provides continuous and stable power, its high speed and low torque characteristics when directly driving the main shaft 5 make it difficult to meet the high torque requirements of the adjusting body 2 during rotation. When the adjusting body 2 is near or far from the inner wall of the wind tunnel opening, it needs to overcome the airflow impact load and its own inertia; insufficient torque can easily lead to rotational jamming or stagnation. The speed reducer, through gear meshing, worm gear, and other transmission structures, can convert the high speed of the motor into a low speed, enabling the drive device to provide sufficient driving force to the main shaft 5. This ensures that the adjusting body 2 can still rotate smoothly under high wind speed and high load conditions, solving the problem of insufficient torque when directly driven by the motor and significantly improving the load adaptability of the mechanism. Furthermore, jet wind tunnel tests require extremely high precision in adjusting the outlet area. Even slight fluctuations in rotational speed can lead to deviations in the adjustment angle, affecting the stability of the airflow velocity. The intervention of a speed reducer can effectively suppress fluctuations in the motor's output rotational speed. On the one hand, the multi-stage transmission structure of the speed reducer has a speed buffering effect, which can filter out the speed pulsations caused by power fluctuations and load changes during motor operation, allowing the main shaft 5 to obtain a stable rotational speed. On the other hand, by selecting speed reducers with different reduction ratios, the rotational speed of the main shaft 5 can be precisely controlled, allowing the adjustment body 2 to rotate at a slow and controllable speed, which makes it easy for operators or the control system to precisely adjust the outlet area according to the test requirements.

[0037] Furthermore, during the rotation of the regulating body 2, momentary overloads may occur due to sudden changes in airflow impact or mechanical jamming. If the motor directly drives the main shaft 5, the overload load will directly act on the motor rotor and windings, easily leading to motor burnout or damage. The reducer can play an overload buffering role in the transmission link; when a momentary overload occurs, the gear meshing clearance or elastic components inside the reducer can absorb part of the impact load, reducing the overload stress transmitted to the motor.

[0038] In this design, a frame 6 is provided on the outside of the adjustment body 2, and the frame 6 is used to fix multiple adjustment bodies 2.

[0039] Secondly, a wind tunnel is provided, including a wind tunnel body, wherein a forward damper adjustment mechanism as described above is installed at the opening of the wind tunnel body.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A forward damper adjustment mechanism, characterized in that, include: The main body is adjustable, and a fixing component is rotatably connected to it. The fixing component is used to connect to the wind tunnel opening. A support component is provided on the adjustment body; The transmission component is connected to the support member at one end and to the main shaft at the other end; A drive unit is connected to the main shaft; Driven by the drive device, the transmission component drives the support component to make the adjustment body rotate around the fixed component as the rotation axis, moving closer to or away from the inner wall of the wind tunnel opening, so as to adjust the air outlet area of ​​the wind tunnel opening.

2. The forward damper adjustment mechanism according to claim 1, characterized in that, The support members are provided in multiple ways, and the multiple support members are spaced apart along the entire length of the adjustment body; Each of the aforementioned support members has a transmission component at its end.

3. The forward damper adjustment mechanism according to claim 2, characterized in that, The support member includes a connecting part and a supporting part, and the connecting part and the supporting part are an integral structure. The connecting part is connected to the adjusting body, and the supporting part is connected to the transmission component.

4. The forward damper adjustment mechanism according to claim 3, characterized in that, The connecting part is a plate-shaped structure, and the supporting part is a structure with one end open and the other end closed. The open end of the support is disposed on the plate-shaped structure, and the closed end of the support is connected to the transmission component.

5. A forward damper adjustment mechanism according to any one of claims 1, 2, or 3, characterized in that, The main adjustment mechanism is a door panel.

6. A forward damper adjustment mechanism according to claim 5, characterized in that, The door panel has a rectangular structure.

7. A forward damper adjustment mechanism according to any one of claims 1-4, characterized in that, The transmission component is a crank.

8. A forward damper adjustment mechanism according to claim 1, characterized in that, The drive device includes a drive unit and a reduction unit, and the drive unit is connected to the main shaft through the reduction unit.

9. A forward damper adjustment mechanism according to claim 8, characterized in that, The drive unit is a motor, and the reduction unit is a speed reducer.

10. A wind tunnel, comprising a wind tunnel body, characterized in that, The wind tunnel body is equipped with a forward damper adjustment mechanism as described in any one of claims 1-9 at the opening.

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