An adjustable-angle wind tunnel test device

Abstract

The present invention discloses an adjustable-angle wind tunnel test device, which comprises a base and an angle adjustment mechanism. The base is used for detachably and fixedly connecting to the ground. The angle adjustment mechanism is aligned with the air outlet of the wind tunnel and includes a vertically arranged rotating member, a horizontally arranged connecting member and a first fastener. The lower end of the rotating member is rotatably installed on the base. The connecting member is detachably and fixedly connected to the rotating member. One end of the connecting member is used for detachably and fixedly connecting to a parachute cabin for holding a parachute. The first fastener has a first section detachably and fixedly connected to the base, a second section detachably and fixedly connected to the rotating member and a separator. The beneficial effects of the present invention are as follows: This wind tunnel test device can be used to simulate the working conditions of a parachute opening in an adverse attitude, and can verify the reliability of the parachute opening operation and analyze the potential risks and hidden dangers of the parachute opening.

Description

Technical Field

[0001] The present invention relates to the technical field of parachute wind tunnel blowing tests, and particularly relates to a wind tunnel test device with adjustable angles. Background Art

[0002] With the development of the application of parachute technology, its usage environment and conditions have become increasingly complex and changeable. To make the attitude and trajectory of the mission payload controllable, the parachute needs to work in various adverse attitudes to decelerate and adjust the attitude of the mission payload.

[0003] Due to the influence of the aerodynamic shape of some mission payloads, the attitude of their projectiles is uncontrollable during flight, which may lead to an excessive angle of attack and the phenomenon of the mission payload being upside down during flight. This phenomenon is relatively unfavorable for the parachute opening operation. To verify the reliability of the parachute opening operation in various adverse attitudes, relevant tests need to be carried out for investigation and verification. Verifying the reliability of the parachute opening operation in adverse attitudes, if carried out in a real flight test environment, will result in high costs for various items, and it is impossible to observe the test process and results, and the relevant testing means are greatly limited. If wind tunnel blowing is used to simulate the relevant environment during flight, the entire test process can be clearly and intuitively understood according to the existing testing means, which has extremely high guiding significance for the scientific research and improvement work of the project. The existing wind tunnel test devices (such as a wind tunnel parachute model test device disclosed in Application No. 202211094690.2) cannot simulate the working conditions of the parachute opening in adverse attitudes, cannot verify the reliability of the parachute opening operation in adverse attitudes, and cannot analyze the potential risks and hazards of the parachute opening. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and propose a wind tunnel test device with adjustable angles, which solves the technical problems in the prior art that due to the influence of the aerodynamic shape of some mission payloads, the attitude of their projectiles is uncontrollable during flight, which may lead to an excessive angle of attack and the phenomenon of the mission payload being upside down during flight. This phenomenon is relatively unfavorable for the parachute opening operation. To verify the reliability of the parachute opening operation in various adverse attitudes, relevant tests need to be carried out for investigation and verification. The existing wind tunnel test devices cannot simulate the working conditions of the parachute opening in adverse attitudes, cannot verify the reliability of the parachute opening operation in adverse attitudes, and cannot analyze the potential risks and hazards of the parachute opening.

[0005] To achieve the above technical purpose, the technical solution of the present invention provides a wind tunnel test device with adjustable angles, including:

[0006] A base, which is used for detachably and fixedly connecting to the ground;

[0007] An angle adjustment mechanism, the angle adjustment mechanism being aligned with the air outlet of the wind tunnel, which includes a vertically arranged rotating member, a horizontally arranged connecting member, and a first fastener. The lower end of the rotating member is rotatably installed on the base. The connecting member is detachably fixed to the rotating member. One end of the connecting member is used for detachably and fixedly connecting with the parachute compartment for holding the parachute. The first fastener has a first section detachably and fixedly connected to the rotating member, a second section detachably and fixedly connected to the base, and a separator. The first section and the second section have a connected state of being fixed to each other and a separated state of being disconnected from each other. The separator is used to change the first section and the second section from the connected state to the separated state.

[0008] Furthermore, the adjustable angle wind tunnel test device further includes a support mechanism, and the base is arranged on the support mechanism.

[0009] Furthermore, the support mechanism includes a fixed shaft and a second fastener. The bottom of the fixed shaft is used for detachably and fixedly connecting with the ground. The base is rotatably installed on the top of the fixed shaft. The second fastener is used to detachably and fixedly connect the base and the fixed shaft.

[0010] Furthermore, the base includes a seat body and a gland. The seat body has a first installation groove and a second installation groove that communicate with each other from bottom to top. Both the first installation groove and the second installation groove are columnar structures, and the diameter of the second installation groove is larger than that of the first installation groove. A first screw hole communicating with the first installation groove is opened on the side wall of the seat body. The gland is detachably and fixedly covered at the notch of the second installation groove. A plurality of second screw holes all communicating with the second installation groove are circumferentially opened on the gland. The upper end of the fixed shaft is rotatably installed in the first installation groove. The lower end of the rotating member rotatably passes through the gland and is rotatably installed in the second installation groove.

[0011] Furthermore, the rotating member includes a rotating shaft and a limiting head. The limiting head is coaxially fixed to the bottom of the rotating shaft. The limiting head is a columnar structure, and the diameter of the limiting head is larger than that of the rotating shaft. The limiting head is rotatably installed in the second installation groove. The connecting member is detachably fixed to the rotating shaft.

[0012] Furthermore, a third screw hole is opened at the upper end of the rotating shaft. The connecting member is a screw rod, and the screw rod passes through the third screw hole and is screwed with the third screw hole.

[0013] Further, a number of fourth screw holes are circumferentially formed in the upper ring of the limit head. The first fastener is an explosive bolt. The lower part of the explosive bolt is used to form the first section and is used for screwing with the fourth screw holes. The upper part of the explosive bolt is used to form the second section and is used for screwing with the corresponding second screw holes. The detonator of the explosive bolt is used to control the detonation of the explosive bolt.

[0014] Further, a number of fifth screw holes are circumferentially formed in the upper end of the fixed shaft. The second fastener is a bolt. The bolt is used to pass through the first screw hole and extend into the corresponding fifth screw hole. The bolt is screwed with the first screw hole and the fifth screw hole.

[0015] Further, the diameter of the rotating shaft is equal to the diameter of the first installation groove.

[0016] Further, a through hole with a diameter equal to the diameter of the rotating shaft is formed in the gland. The lower end of the rotating shaft rotatably passes through the through hole and extends into the second installation groove.

[0017] Compared with the prior art, the beneficial effects of the present invention include: during use, when the wind field reaches the test environment, a parachute opening command is issued. The parachute is ejected from the parachute compartment by the parachute opening pyrotechnic device, inflates and expands under the action of the airflow, and provides a rotational torque to the rotating member. At this time, by operating the separator of the first fastener, the first section and the second section are in a separated state of being disconnected from each other, the rotating member is released from the base, and the rotating member rotates to change its attitude and angle under the pulling force of the parachute until the connecting member is in the same straight line direction as the parachute. During the simulation flight process, the parachute adjusts the attitude of the mission payload to the normal attitude, thus achieving the verification purpose of automatically adjusting the attitude after the parachute opens at an unfavorable angle. This wind tunnel test device can be used to simulate the working condition of the parachute opening at an unfavorable attitude, and can verify the reliability of the parachute opening work and analyze the potential risks and hidden dangers of the parachute opening. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram when a wind tunnel test device with adjustable angle provided by the present invention is installed;

[0019] Figure 2 is Figure 1 a three-dimensional structural schematic diagram of a wind tunnel test device with adjustable angle in

[0020] Figure 3 is Figure 2 a structural schematic diagram of a wind tunnel test device with adjustable angle in

[0021] Figure 4 is Figure 3Schematic structural view of a rotatable member of an adjustable-angle wind tunnel test device;

[0022] Figure 5 is Figure 3 Top view of a rotatable member of an adjustable-angle wind tunnel test device;

[0023] Figure 6 is Figure 3 Schematic structural view of a gland of an adjustable-angle wind tunnel test device;

[0024] Figure 7 is Figure 3 Top view of a gland of an adjustable-angle wind tunnel test device;

[0025] In the figure: 1 - wind tunnel, 2 - parachute compartment, 100 - base, 110 - seat body, 111 - first installation groove, 112 - second installation groove, 113 - first screw hole, 120 - gland, 121 - second screw hole, 122 - through hole, 200 - angle adjustment mechanism, 210 - rotatable member, 211 - rotating shaft, 2111 - third screw hole, 212 - limiting head, 2121 - fourth screw hole, 220 - connecting member, 230 - first fastener, 300 - support mechanism, 310 - fixed shaft, 311 - fifth screw hole, 320 - second fastener. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The present invention provides an adjustable-angle wind tunnel test device, the structure of which is as shown in Figure 1 - Figure 3 shown, including a base 100 and an angle adjustment mechanism 200. The base 100 is used for detachably and fixedly connecting to the ground; the angle adjustment mechanism 200 is aligned with the air outlet of the wind tunnel 1 and includes a vertically arranged rotatable member 210, a horizontally arranged connecting member 220 and a first fastener 230. The lower end of the rotatable member 210 is rotatably installed on the base 100. The connecting member 220 is detachably fixed to the rotatable member 210. One end of the connecting member 220 is used for detachably and fixedly connecting to a parachute compartment 2 for holding a parachute. The first fastener 230 has a first section detachably and fixedly connected to the rotatable member 210, a second section detachably and fixedly connected to the base 100, and a separator. The first section and the second section have a mutually fixed connection state and a mutually disconnected separation state. The separator is used for changing the first section and the second section from the connection state to the separation state.

[0028] In use, the parachute compartment 2 containing the parachute is detachably and fixedly connected to one end of the connecting member 220. By rotating the rotating member 210, the angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be adjusted. Then, by operating the first fastener 230, the first section can be detachably and fixedly connected to the base 100, and the second section can be detachably and fixedly connected to the rotating member 210, and the first section and the second section are in a mutually fixed connection state, so that the rotating member 210 can be fixedly connected to the base 100. When the wind field reaches the test environment, a parachute opening command is issued, and the parachute is ejected from the parachute compartment 2 by the parachute-opening pyrotechnic device, inflates and expands under the action of the airflow, and provides a rotational torque to the rotating member 210. At this time, by operating the separator of the first fastener 230, the first section and the second section are in a separated state of being disconnected from each other, the fixing between the rotating member 210 and the base 100 is released, and the rotating member 210 rotates under the pulling force of the parachute to change its attitude and angle until the connecting member 220 is in the same straightening direction as the parachute, simulating the working condition in the flight process where the parachute adjusts the attitude of the mission payload to the normal attitude, and achieving the verification purpose of automatically adjusting the attitude after the parachute opens at an unfavorable angle. This wind tunnel test device can be used to simulate the working condition of the parachute opening at an unfavorable attitude, and can verify the reliability of the parachute opening work and analyze the potential risks and hazards of the parachute opening.

[0029] As a preferred embodiment, please refer to Figure 1 , the adjustable-angle wind tunnel test device further includes a support mechanism 300, and the base 100 is arranged on the support mechanism 300, so that the base 100 has a certain height, which is convenient for aligning the angle adjustment mechanism 200 with the air outlet of the wind tunnel 1.

[0030] As a preferred embodiment, please refer to Figure 1 and Figure 2 , the support mechanism 300 includes a fixed shaft 310 and a second fastener 320. The bottom of the fixed shaft 310 is used for detachably and fixedly connecting to the ground. The base 100 is rotatably installed on the top of the fixed shaft 310. The second fastener 320 is used for detachably and fixedly connecting the base 100 and the fixed shaft 310. The base 100 is rotatably installed on the top of the fixed shaft 310, so that the angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be adjusted by rotating the base 100. On the basis of adjusting the angle between the connecting member 220 and the air outlet of the wind tunnel 1 by rotating the rotating member 210, the adjustment range of the angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be expanded, and further the range of simulating the working condition of the parachute opening at an unfavorable attitude can be expanded.

[0031] As a preferred embodiment, please refer to Figure 2 and Figure 3 , the base 100 includes a base body 110 and a gland 120. The base body 110 has a first installation groove 111 and a second installation groove 112 that communicate with each other from bottom to top. Both the first installation groove 111 and the second installation groove 112 are columnar structures, and the diameter of the second installation groove 112 is larger than that of the first installation groove 111. A first screw hole 113 communicating with the first installation groove 111 is formed on the side wall of the base body 110. The gland 120 is detachably and fixedly covered at the notch of the second installation groove 112. A plurality of second screw holes 121 that all communicate with the second installation groove 112 are circumferentially formed on the gland 120. The upper end of the fixed shaft 310 is rotatably installed in the first installation groove 111, so as to realize the rotational connection between the fixed shaft 310 and the base 100. The lower end of the rotating member 210 rotatably passes through the gland 120 and is rotatably installed in the second installation groove 112, so as to realize the rotational connection between the rotating member 210 and the base 100, facilitating adjusting the angle between the connecting member 220 and the air outlet of the wind tunnel 1 by rotating the rotating member 210 or rotating the base 100, and further simulating the working condition of the parachute opening in an adverse attitude.

[0032] As a preferred embodiment, please refer to Figure 3 , the rotating member 210 includes a rotating shaft 211 and a limiting head 212. The limiting head 212 is coaxially fixed to the bottom of the rotating shaft 211. The limiting head 212 is a columnar structure, and the diameter of the limiting head 212 is larger than that of the rotating shaft 211. The limiting head 212 is rotatably installed in the second installation groove 112. The connecting member 220 is detachably fixed to the rotating shaft 211. Through the rotational connection between the limiting head 212 and the second installation groove 112, the rotating member 210 can rotate relative to the base 100. When it is necessary to repair the limiting head 212 or add lubricating oil to the limiting head 212, the gland 120 can be removed from the opening of the second installation groove 112, and it is convenient to limit the limiting head 212 through the gland 120 to prevent the limiting head 212 from disengaging from the rotational connection with the base body 110.

[0033] As a preferred embodiment, please refer to Figure 4 and Figure 5 , a third screw hole 2111 is formed at the upper end of the rotating shaft 211. The connecting member 220 is a screw rod. The screw rod passes through the third screw hole 2111 and is screwed with the third screw hole 2111, so as to realize the detachable fixation of the connecting member 220 to the rotating member 210.

[0034] As a preferred embodiment, please refer to Figure 4 and Figure 5 , a plurality of fourth screw holes 2121 are circumferentially formed on the limiting head 212. The first fastener 230 is an explosive bolt. The lower part of the explosive bolt is used to form the first section and is used for screwing with the fourth screw holes 2121. The upper part of the explosive bolt is used to form the second section and is used for screwing with the corresponding second screw holes 121. The detonator of the explosive bolt is used to control the detonation of the explosive bolt, detachably connect the parachute compartment 2 containing the parachute with one end of the connecting member 220, and then align each of the fourth screw holes 2121 on the limiting head 212 with the corresponding second screw holes 121 on the gland 120, so that the included angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be adjusted. Screw the explosive bolt with both the fourth screw holes 2121 and the corresponding second screw holes 121. During the test, after the parachute deploys for a certain period of time, start the explosive bolt. The explosive bolt disconnects between the limiting head 212 and the gland 120, and the rotating member 210 is released from the fixed connection with the base 100, rotates and changes the attitude and angle under the traction of the parachute, simulating the condition that during the flight process, the parachute adjusts the attitude of the mission payload to the normal attitude.

[0035] As a preferred embodiment, please refer to Figure 1 and Figure 3 , a plurality of fifth screw holes 311 are circumferentially formed at the upper end of the fixed shaft 310. The second fastener 320 is a bolt. The bolt is used to pass through the first screw hole 113 and extend into the corresponding fifth screw hole 311. The bolt is screwed with the first screw hole 113 and the fifth screw hole 311, align the first screw hole 113 on the seat body 110 with the corresponding fifth screw hole 311 on the fixed shaft 310, so that the included angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be further adjusted. Then screw the bolt with the first screw hole 113 and the fifth screw hole 311 to realize the detachable fixed connection between the base 100 and the fixed shaft 310. Since the positions of the plurality of second screw holes 121 circumferentially formed on the gland 120 and the plurality of fourth screw holes 2121 circumferentially formed on the limiting head 212 are limited, the comprehensive angle adjustment of the connecting member 220 and the air outlet of the wind tunnel 1 cannot be realized. By rotating the base 100, the included angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be further adjusted. On the basis of adjusting the included angle between the connecting member 220 and the air outlet of the wind tunnel 1 by rotating the rotating member 210, the adjustment range of the included angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be expanded.

[0036] As a preferred embodiment, please refer to Figure 3 , the diameter of the rotating shaft 211 is equal to the diameter of the first mounting groove 111, so that the lower end of the rotating shaft 211 can extend into the first mounting groove 111, and the lower end of the rotating shaft 211 can be rotatably connected to the seat body 110.

[0037] As a preferred embodiment, please refer to Figure 6 and Figure 7 , a through hole 122 with a diameter equal to the diameter of the rotating shaft 211 is formed in the gland 120, and the lower end of the rotating shaft 211 rotatably passes through the through hole 122 and extends into the second mounting groove 112, so that the rotating shaft can be rotatably connected to the gland 120, improving the rotational stability of the rotating shaft 211.

[0038] To better understand the present invention, the working principle of the technical solution of the present invention will be described in detail below in conjunction with Figure 1 - Figure 7 :

[0039] During use, the parachute cabin 2 for holding the parachute is detachably and fixedly connected to one end of the connecting member 220. By rotating the rotating member 210, each of the fourth screw holes 2121 on the limiting head 212 is aligned with the corresponding second screw hole 121 on the gland 120, so that the included angle between the connecting member 220 and the air outlet of the wind tunnel 1 can be adjusted. The explosive bolt is screwed into both the fourth screw hole 2121 and the corresponding second screw hole 121, so that the rotating member 210 can be fixedly connected to the base 100. When the wind field reaches the test environment, a parachute opening command is issued, and the parachute is ejected from the parachute cabin 2 by the parachute opening pyrotechnic device, inflates and expands under the action of the air flow, and provides a rotational torque to the rotating member 210. After the parachute opens for a certain period of time during the test, the initiator of the explosive bolt is activated, the explosive bolt disconnects between the limiting head 212 and the gland 120, the rotating member 210 is disengaged from the fixed connection with the base 100, and the rotating member 210 rotates under the pulling force of the parachute to change its attitude and angle until the connecting member 220 is in the same straight line as the parachute. During the simulated flight process, the parachute adjusts the attitude of the mission payload to the normal attitude, achieving the verification purpose of automatically adjusting the attitude after the parachute opens at an unfavorable angle. This wind tunnel test device can be used to simulate the working condition of the parachute opening at an unfavorable attitude, and can verify the reliability of the parachute opening work and analyze the potential risks and hidden dangers of the parachute opening.

[0040] The adjustable-angle wind tunnel test device provided by the present invention has the following beneficial effects:

[0041] (1) Solve the problem that the test is limited by existing conditions, reduce the cost of the reliability test of the parachute opening in an adverse attitude, increase convenience, and the process is simple;

[0042] (2) The test device of the present invention has a simple structure, modular combination, convenient maintenance and replacement, easy to use and operate, strong versatility, can be widely used in the test of the parachute opening in different windward angles, has a broad market prospect, so it has good practicability, is easy to promote and apply, and has great engineering application value;

[0043] (3) It can simulate the working condition that the parachute adjusts the attitude of the mission payload to the normal attitude during the flight process, and achieves the verification purpose of automatically adjusting the attitude after the parachute opens at an adverse angle. This wind tunnel test device can be used to simulate the working condition of the parachute opening in an adverse attitude, and can verify the reliability of the parachute opening work and analyze the potential risks and hazards of the parachute opening.

[0044] The specific implementation manners of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An adjustable-angle wind tunnel test device, characterized in that, it includes: a base for detachably and fixedly connecting to the ground; an angle adjustment mechanism aligned with the air outlet of the wind tunnel, which includes a vertically arranged rotating member, a horizontally arranged connecting member and a first fastener. The lower end of the rotating member is rotatably installed on the base, the connecting member is detachably fixed to the rotating member, one end of the connecting member is used for detachably and fixedly connecting to a parachute cabin for holding a parachute, the first fastener has a first section detachably and fixedly connected to the rotating member, a second section detachably and fixedly connected to the base, and a separator. The first section and the second section have a connected state of being fixed to each other and a separated state of being disconnected from each other, and the separator is used to change the first section and the second section from the connected state to the separated state; a support mechanism, the base is arranged on the support mechanism, the support mechanism includes a fixed shaft and a second fastener, the bottom of the fixed shaft is used for detachably and fixedly connecting to the ground, the base is rotatably installed on the top of the fixed shaft, and the second fastener is used for detachably and fixedly connecting the base and the fixed shaft; the base includes a seat body and a gland. The seat body has a first installation groove and a second installation groove that communicate with each other from bottom to top. Both the first installation groove and the second installation groove are columnar structures, and the diameter of the second installation groove is larger than that of the first installation groove. A first screw hole communicating with the first installation groove is opened on the side wall of the seat body. The gland is detachably and fixedly covered at the notch of the second installation groove. A plurality of second screw holes communicating with the second installation groove are circumferentially opened on the gland. The upper end of the fixed shaft is rotatably installed in the first installation groove, and the lower end of the rotating member rotatably passes through the gland and is rotatably installed in the second installation groove; the rotating member includes a rotating shaft and a limit head. The limit head is coaxially fixed to the bottom of the rotating shaft. The limit head is a columnar structure, and the diameter of the limit head is larger than that of the rotating shaft. The limit head is rotatably installed in the second installation groove, and the connecting member is detachably fixed to the rotating shaft; a third screw hole is opened at the upper end of the rotating shaft. The connecting member is a screw rod, and the screw rod passes through the third screw hole and is screwed with the third screw hole; a plurality of fourth screw holes are circumferentially opened on the limit head. The first fastener is an explosive bolt. The lower part of the explosive bolt is used to form the first section and is used for screwing with the fourth screw hole. The upper part of the explosive bolt is used to form the second section and is used for screwing with the corresponding second screw hole. The detonator of the explosive bolt is used to control the detonation of the explosive bolt.

2. The adjustable-angle wind tunnel test device according to claim 1, characterized in that, a plurality of fifth screw holes are circumferentially opened at the upper end of the fixed shaft. The second fastener is a bolt, and the bolt is used to pass through the first screw hole and extend into the corresponding fifth screw hole. The bolt is screwed with the first screw hole and the fifth screw hole.

3. The adjustable-angle wind tunnel test device according to claim 1, characterized in that, the diameter of the rotating shaft is equal to the diameter of the first mounting groove.

4. The adjustable-angle wind tunnel test device according to claim 3, characterized in that, a through hole with a diameter equal to the diameter of the rotating shaft is formed in the gland, and the lower end of the rotating shaft rotatably passes through the through hole and extends into the second mounting groove.

Images