Flexible test piece high-speed wind tunnel protection device and design method and test method thereof

Abstract

The invention belongs to the technical field of high-speed wind tunnel tests, and particularly relates to a flexible test piece high-speed wind tunnel protection device and a design method and a test method thereof. The protection device comprises a conical pendulum connected with the tail end of the flexible test piece, a vertical protection ring sleeved in front of the conical pendulum, and a plurality of protection ring traction ropes connected to the protection ring; the control system tensions and loosens the protection ring traction rope through the driving motor to adjust the height of the protection ring. The protection device is simple in structure, reasonable in strength, low in cost, small in pneumatic interference on the flexible test piece and convenient to operate on site. The design method fully considers the aerodynamic characteristics of the test piece, and can be popularized and applied to protection device design of similar tests. According to the test method, full-process automatic control is realized through communication with a wind tunnel control system, the control mode is convenient, the position of the protection device can be accurately adjusted, the test efficiency is improved, and the working intensity is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-speed wind tunnel testing, and in particular relates to a high-speed wind tunnel protection device for a flexible test piece and a design method and a testing method thereof. Background Art

[0002] For a long time, high-speed wind tunnel testing has primarily focused on rigid testing, with all types of struts and test models using rigid test models. In recent years, with the advancement of scientific research, new and diverse requirements have been proposed for high-speed wind tunnel testing, including hose-type aerial refueling tests, drag cone calibration tests, and flexible parachute tests. During the implementation of these new types of tests, the safety and protection of test equipment are crucial, and appropriate protective measures must be implemented to ensure the smooth conduct of these new tests in high-speed wind tunnels and the acquisition of effective and reliable test results.

[0003] Currently, there is an urgent need to develop a high-speed wind tunnel protection device for flexible test pieces and its design method and test method. Summary of the Invention

[0004] One technical problem to be solved by the present invention is to provide a high-speed wind tunnel protection device for a flexible test piece. Another technical problem to be solved by the present invention is to provide a design method for a high-speed wind tunnel protection device for a flexible test piece. Still another technical problem to be solved by the present invention is to provide a testing method for a high-speed wind tunnel protection device for a flexible test piece, so as to overcome the defects of the prior art.

[0005] The flexible test piece high-speed wind tunnel protection device of the present invention comprises a conical pendulum connected to the rear end of the flexible test piece, a vertical protective ring mounted in front of the conical pendulum, and a plurality of tensioning rope connection points distributed along the circumference of the protective ring, each tensioning rope connection point being connected to a traction rope of the protective ring; one end of the traction rope of the protective ring is connected to the protective ring, and the other end is fixed to the inner wall of the high-speed wind tunnel test section; The system also includes a control system, which tightens and loosens the traction rope of the protection ring through a driving motor to adjust the height of the protection ring.

[0006] Furthermore, three tensioning rope connection points, namely points A, B and C, are set on the protective ring of the protective device, which are defined as a three-point triangular distribution. Point A is the vertex of the protective ring, and points B and C are located at the lower part of the protective ring and are symmetrically distributed on the left and right. The traction rope of the protective ring connected to point A is set as an active tensioning rope, which is pulled up and down by a driving motor. The traction rope of the protective ring connected to points B and C is set as a follow-up tensioning rope, which is tightened in a tensioned state.

[0007] The design method of the flexible test piece high-speed wind tunnel protection device of the present invention comprises the following steps: S31. Analyze the flow field in the high-speed wind tunnel test section; Analyze the flow field of the high-speed wind tunnel test section, obtain the test section cross-sectional dimensions and length, and determine the location of the flexible test piece's tail end; S32. Perform static aerodynamic analysis of the flexible test piece; The static flow field of the conical pendulum connected to the tail end of the flexible test piece was obtained through CFD calculation; S33. Perform dynamic aerodynamic analysis of the flexible test piece; Through CFD calculation, we can obtain an incoming flow Mach number. Ma The dynamic flow field and motion trajectory of the conical pendulum connected to the tail end of the flexible test piece are used to obtain the rotation center of the flexible test piece. L 中心位置 , diameter of circular trajectory of conical pendulum L 直径 , the shortest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel L 下限位置 , L 下限位置 = L 中心位置 -( L 中心位置 / 2); According to the Mach number range of the wind tunnel test, the corresponding Mach number of each incoming flow is obtained through CFD calculation Ma The center of rotation below L 中心位置 , diameter of circular trajectory of conical pendulum L 直径 , the shortest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel L 下限位置 At the same time, along the airflow direction, the protective ring is set at 2 / 3~3 / 4 of the total length of the flexible test piece, and the remaining length of the flexible test piece passing through the protective ring is not more than half of the length of the cross-section of the test section; before the test begins, the flexible test piece passes through the protective ring and hangs freely on the lower edge of the protective ring; during the test, the blowing speed is gradually increased by slowly starting, and under the action of aerodynamic resistance, the flexible test piece is lifted and straightened, and performs a conical swinging motion in the protective ring; the vertical symmetry center line of the protective ring is always located on the left and right symmetry plane of the test section, and no left and right adjustment is made in the horizontal direction, and only height adjustment is made in the vertical direction; S34. Design and process the protective ring; According to the diameter of the protective ring Φ1= (1.2~1.3) L 直径 , Guard ring thickness H =5.0mm, guard ring length L =15.0mm~20.0mm, using 30CrMnSiA to process the protection ring; S35. Design control systems; Three tensioning rope connection points, A, B, and C, are set on the protection ring in a triangular distribution, which is defined as a triangular three-point distribution. Point A is the vertex of the protection ring, and points B and C are located at the bottom of the protection ring and are symmetrically distributed on the left and right. The protection ring traction rope connected to point A is set as an active tensioning rope, and the protection ring is pulled up and down by a driving motor. The protection ring traction rope connected to points B and C is set as a follow-up tensioning rope. The follow-up tensioning rope follows the movement in the tensioned state and is not connected to the driving motor for active control. S36. Select the drive motor and the protection ring traction rope; The aerodynamic load of the protection ring is obtained by CFD calculation. Taking into account the aerodynamic interference, the wire rope diameter Φ and the wire rope tension Fs are determined. Then, select the drive motor according to Fs=9550×(P*i / n); where Fs is the wire rope tension, P is the motor power, n is the motor speed, and i is the reduction ratio; S37. Establish the incoming flow Mach number Ma Correspondence table with guard ring position; The closest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel obtained by S33 L 下限位置 , determine the position of the protection ring and form the incoming flow Mach number Ma The corresponding table with the protection ring position is input into the control system.

[0008] The testing method of the flexible test piece high-speed wind tunnel protection device of the present invention comprises the following steps: S41. Integrate the control system of the protective device into the wind tunnel control system; Add a control system for protective devices to the wind tunnel control system, and add a control system interface for protective devices to the wind tunnel control system interface; S42. Determine the incoming flow Mach number Ma ; According to the wind tunnel test schedule, determine the Mach number of the first high-speed wind tunnel test and obtain the incoming flow Mach number. Ma , according to the incoming flow Mach number Ma Corresponding to the guard ring position table, determine the guard ring position; S43. Start the drive motor; Start the drive motor, and the active tensioning rope pulls the protection ring up and down to the corresponding position. When it is in place, the drive motor buzzer sounds to prompt that the protection ring is in place; S44. Locking protection ring; The active tension rope and the two follower tension ropes are locked to achieve the positioning of the guard ring, and a signal that the guard ring positioning is completed is sent to the wind tunnel control system; S45. Conduct high-speed wind tunnel tests on flexible test pieces; The high-speed wind tunnel is started, the first high-speed wind tunnel test is completed, the Mach number of the second high-speed wind tunnel test is determined according to the wind tunnel test schedule, and the process returns to S42 until all high-speed wind tunnel tests at the test Mach numbers on the wind tunnel test schedule are completed.

[0009] The flexible test piece high-speed wind tunnel protection device of the present invention adopts a triangular three-point distribution and has the following advantages: 1. The protection device has a simple structure and is easy to operate on site; 2. As the number of connection points is reduced from 4 to 3, the number of belay ring traction ropes is also reduced, reducing the interference and impact of the belay device on high-speed wind tunnel testing; 3. It is helpful to simplify the control system structure and control process.

[0010] The flexible test piece high-speed wind tunnel protection device of the present invention has a simple structure, reasonable strength, low cost, small aerodynamic interference to the flexible test piece, and is easy to operate on site; the design method fully considers the aerodynamic characteristics of the test piece and can be promoted and applied to the design of protection devices for similar tests; the test method realizes automatic control of the entire process by communicating with the wind tunnel control system, has a convenient control method, can accurately adjust the position of the protection device, improves test efficiency, and reduces work intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a high-speed wind tunnel protection device for a flexible test piece according to the present invention; Figure 2 This is a schematic diagram of the high-speed wind tunnel test section structure; Figure 3a Schematic diagram of the static flow field of the flexible test piece with a conical pendulum connected at the tail end (front view); Figure 3b Schematic diagram of the static flow field of the flexible test piece with a conical pendulum connected at the tail end (rear view); Figure 3c Schematic diagram of the static flow field of the flexible test piece with a conical pendulum connected at the tail end (CFD diagram); Figure 4a Schematic diagram of the motion form of the flexible test piece with a conical pendulum connected at the tail end (front view); Figure 4b Schematic diagram of the motion of the flexible test piece with a conical pendulum connected at the tail end (rear view); Figure 4c Schematic diagram of the position of the protection ring; Figure 5 It is a schematic diagram of a triangle 3-point distributed control system; Figure 6 A flow chart of a test method for a high-speed wind tunnel protection device for a flexible test piece according to the present invention; Figure 7aThis is a schematic diagram of an X-shaped 4-point distributed protection ring (main view); Figure 7b Schematic diagram of an X-shaped 4-point distributed protection ring (side view); Figure 8 Schematic diagram of the structure of the high-speed wind tunnel protection device for the flexible test piece of the comparative example.

[0012] In the figure, 1. Protective ring; 2. Conical pendulum; 3. Protective ring traction rope; 4. Driving motor; 5. Active tensioning rope; 6. Follow-up tensioning rope; 7. Flexible test piece; 8. Tensioning rope connection point. DETAILED DESCRIPTION

[0013] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0014] Example 1: Figure 1 As shown, the flexible test piece high-speed wind tunnel protection device of this embodiment includes a conical pendulum 2 connected to the tail end of the flexible test piece 7, a vertical protection ring 1 mounted in front of the conical pendulum 2, and a plurality of tensioning rope connection points 8 distributed along the circumference of the protection ring 1. Each tensioning rope connection point 8 is connected to a protection ring traction rope 3. One end of the protection ring traction rope 3 is connected to the protection ring 1, and the other end is fixed to the inner wall of the high-speed wind tunnel test section. The system also includes a control system, which tightens and loosens the protection ring traction rope 3 by driving the motor 4 to adjust the height of the protection ring 1.

[0015] Furthermore, three tensioning rope connection points 8, namely points A, B and C, are set on the protection ring 1 of the protection device, which are defined as a triangular three-point distribution. Point A is the vertex of the protection ring 1, and points B and C are located at the lower part of the protection ring 1 and are symmetrically distributed on the left and right; the protection ring traction rope 3 connected to point A is set as an active tensioning rope 5, which is pulled up and down by the driving motor 4, and the protection ring traction rope 3 connected to points B and C is set as a follow-up tensioning rope 6, which performs follow-up tensioning in the tensioned state.

[0016] The design method of the flexible test piece high-speed wind tunnel protection device of this embodiment includes the following steps: S31. Analyze the flow field in the high-speed wind tunnel test section; like Figure 2 As shown, the flow field of the high-speed wind tunnel test section is analyzed to obtain the cross-sectional dimensions and length of the test section, and determine the position of the tail end of the flexible test piece 7; S32. Perform static aerodynamic analysis of the flexible test piece 7; Through CFD calculation, we can obtain Figure 3a 、 Figure 3b 、 Figure 3c The static flow field of the conical pendulum 2 connected to the tail end of the flexible test piece 7 shown; S33. Dynamic aerodynamic analysis of the flexible test piece 7; like Figure 4a 、 Figure 4b As shown, through CFD calculation, an incoming flow Mach number is obtained Ma The dynamic flow field of the conical pendulum 2 connected to the tail end of the flexible test piece 7 and the motion trajectory of the conical pendulum 2 are used to obtain the rotation center of the flexible test piece 7. L 中心位置 , diameter of circular trajectory of conical pendulum L 直径 , the shortest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel L 下限位置 , L 下限位置 = L 中心位置 - L 中心位置 / 2; According to the Mach number range of the wind tunnel test, the corresponding Mach number of each incoming flow is obtained through CFD calculation Ma The center of rotation below L 中心位置 , diameter of circular trajectory of conical pendulum L 直径 , the shortest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel L 下限位置 At the same time, Figure 4c As shown, along the airflow direction, the protective ring 1 is set at 2 / 3~3 / 4 of the total length of the flexible test piece 7, and the remaining length of the flexible test piece 7 passing through the protective ring 1 is not greater than half of the cross-sectional length of the test section; if the diameter of the test section is 2.0m×2.0m, the remaining length is generally less than 1.0m. The core purpose of such limitation is to ensure the safety of the test, because placing a remaining length that is too long is prone to swinging back and hitting the wall of the test section; before the start of the test, the flexible test piece 7 passes through the protective ring 1 and hangs freely and is placed on the lower edge of the protective ring 1; during the test, a slow start-up method is used to gradually increase the blowing speed, and under the action of aerodynamic resistance, the flexible test piece 7 is lifted and straightened, and performs a conical swinging motion inside the protective ring 1; the vertical symmetry center line of the protective ring 1 is always located on the left and right symmetry planes of the test section, and no left and right adjustment is made in the horizontal direction, and only height adjustment is made in the vertical direction; S34. Design and process the protective ring 1; According to the diameter of the protection ring Φ1 = 1.2 ~ 1.3 L 直径 , Guard ring thickness H =5.0mm, guard ring length L =15.0mm~20.0mm, using 30CrMnSiA to process the protection ring 1; S35. Design control systems; like Figure 5 As shown, three tensioning rope connection points 8 are set on the protection ring 1 at points A, B, and C in a triangular distribution, which is defined as a triangular three-point distribution. Point A is the vertex of the protection ring 1, and points B and C are located at the lower part of the protection ring 1 and are symmetrically distributed on the left and right. The protection ring traction rope 3 connected to point A is set as an active tensioning rope 5, which is pulled up and down by the driving motor 4. The protection ring traction rope 3 connected to points B and C is set as a follower tensioning rope 6. The follower tensioning rope 6 follows when tensioned and is not connected to the driving motor 4 for active control. S36. Select the drive motor 4 and the protective ring traction rope 3; The aerodynamic load of the protection ring 1 is obtained by CFD calculation. Taking into account the aerodynamic interference, the wire rope diameter Φ and the wire rope tension Fs are determined. Then, according to Fs=9550×P*i / n, select the drive motor 4; where Fs is the wire rope tension, P is the motor power, n is the motor speed, and i is the reduction ratio; S37. Establish the incoming flow Mach number Ma Correspondence table with protection ring 1 position; The closest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel obtained by S33 L 下限位置 , determine the position of guard ring 1 and form the incoming flow Mach number Ma The position of the protection ring 1 corresponds to the table and is input into the control system.

[0017] like Figure 6 As shown, the test method of the flexible test piece high-speed wind tunnel protection device of this embodiment includes the following steps: S41. Integrate the control system of the protective device into the wind tunnel control system; Add a control system for protective devices to the wind tunnel control system, and add a control system interface for protective devices to the wind tunnel control system interface; S42. Determine the incoming flow Mach number Ma ; According to the wind tunnel test schedule, determine the Mach number of the first high-speed wind tunnel test and obtain the incoming flow Mach number. Ma , according to the incoming flow Mach number Ma Corresponding to the protection ring 1 position table, determine the protection ring 1 position; S43. Start the drive motor 4; Start the driving motor 4, and the active tensioning rope 5 pulls the protection ring 1 up and down to the corresponding position. After it is in place, the driving motor 4 buzzer sounds, prompting that the position of the protection ring 1 is adjusted in place; S44. Locking protection ring 1; The active tension rope 5 and the two follower tension ropes 6 are all locked to achieve the positioning of the guard ring 1, and a signal that the positioning of the guard ring 1 is completed is sent to the wind tunnel control system; S45. Conduct high-speed wind tunnel tests on flexible test pieces 7; The high-speed wind tunnel is started, the first high-speed wind tunnel test is completed, the Mach number of the second high-speed wind tunnel test is determined according to the wind tunnel test schedule, and the process returns to S42 until all high-speed wind tunnel tests at the test Mach numbers on the wind tunnel test schedule are completed.

[0018] In this embodiment, the diameter of the steel wire rope is Φ=5.0 mm. According to relevant technical documents, the bearing capacity of the steel wire rope is about 150.0 kg. Taking into account the aerodynamic interference and the actual aerodynamic load, it is determined that the steel wire rope can be used in this embodiment.

[0019] Selecting an appropriate drive motor 4 is crucial to avoid both failing to meet technical requirements and wasting equipment performance and resources. Calculations show that when the drive motor 4 has a power of P = 3 kW, a motor speed of n = 1000 r / min, and a reduction ratio i = 50, it can deliver a tensile force of 1432 N to the wire rope. This corresponds to a gravity of approximately 143 kg less than the wire rope's load-bearing capacity of 150.0 kg. The tensile force of the drive motor 4 matches the wire rope's technical parameters and meets the requirements of this embodiment.

[0020] Example 2: Figure 7a 、 Figure 7b As shown, the protection ring 1 of the protection device of this embodiment is provided with four tensioning rope connection points 8 symmetrically arranged in the upper and lower directions, which is defined as an X-shaped four-point distribution; When designing a control system adapted to the X-type 4-point distribution, it was found that at least the protection ring traction rope 3 connected to the two tensioning rope connection points 8 above needed to be synchronously controlled for synchronous movement. Whether a synchronous controller or a pulley assembly was used for synchronous movement, it would involve increasing the control difficulty and adding components, and the deformation and twisting of the protection ring 1 could not be avoided. Therefore, it was decided not to adopt the X-type 4-point distribution.

[0021] Comparative example: Figure 8 As shown, the high-speed wind tunnel protection device for the flexible test specimen in this comparative example features a conical pendulum 2 connected to the tail end of the flexible test specimen 7, which is then connected to several protective ring traction ropes 3. The other end of each protective ring traction rope 3 is fixed to the inner wall of the high-speed wind tunnel test section. Tests have confirmed that while this high-speed wind tunnel protection device for the flexible test specimen in this comparative example ensures test safety, it also restricts and affects the actual motion of the flexible test specimen 7 in the high-speed wind tunnel flow, distorting the test results. This prevents the acquisition of true data through testing and provides a basis for optimizing related devices, equipment, and instruments.

[0022] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the description and implementation methods. For those familiar with the art, all features disclosed in the present invention, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. Flexible test piece high-speed wind tunnel protection device, characterized in that: The protection device comprises a conical pendulum (2) connected to the tail end of the flexible test piece (7), a vertical protection ring (1) mounted in front of the conical pendulum (2), and a plurality of tensioning rope connection points (8) distributed along the circumference of the protection ring (1), each tensioning rope connection point (8) being connected to a protection ring traction rope (3); one end of the protection ring traction rope (3) is connected to the protection ring (1), and the other end is fixed to the inner wall of the high-speed wind tunnel test section; It also includes a control system, which tightens and loosens the protection ring traction rope (3) through a driving motor (4) to adjust the height of the protection ring (1).

2. The flexible test piece high-speed wind tunnel protection device according to claim 1, characterized in that: The protection ring (1) of the protection device is provided with three tensioning rope connection points (8), namely, point A, point B, and point C, which are defined as a triangular three-point distribution. Point A is the vertex of the protection ring (1), and points B and C are located at the lower part of the protection ring (1) and are symmetrically distributed on the left and right sides. The protection ring traction rope (3) connected to point A is set as an active tensioning rope (5), which is pulled up and down by a driving motor (4). The protection ring traction rope (3) connected to points B and C is set as a follow-up tensioning rope (6), which is tensioned in a follow-up state.

3. A method for designing a high-speed wind tunnel protective device for a flexible test piece, which is used to design the high-speed wind tunnel protective device for a flexible test piece according to claim 2, characterized in that: The design method comprises the following steps: S31. Analyze the flow field in the high-speed wind tunnel test section; Analyze the flow field of the high-speed wind tunnel test section, obtain the cross-sectional dimensions and length of the test section, and determine the position of the tail end of the flexible test piece (7); S32. Perform static aerodynamic analysis of the flexible test piece (7); The static flow field of the conical pendulum (2) connected to the tail end of the flexible test piece (7) is obtained through CFD calculation; S33. Perform dynamic aerodynamic analysis of the flexible test piece (7); Through CFD calculation, we can obtain an incoming flow Mach number. Ma The center of rotation of the flexible test piece (7) is obtained by analyzing the dynamic flow field of the conical pendulum (2) connected to the tail end of the flexible test piece (7) and the motion trajectory of the conical pendulum (2). L 中心位置 , diameter of circular trajectory of conical pendulum L 直径 , the shortest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel L 下限位置 , L 下限位置 = L 中心位置 -( L 中心位置 / 2); According to the Mach number range of the wind tunnel test, the corresponding Mach number of each incoming flow is obtained through CFD calculation Ma The center of rotation below L 中心位置 , diameter of circular trajectory of conical pendulum L 直径 , the shortest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel L 下限位置 ; At the same time, along the airflow direction, the protective ring (1) is set at 2 / 3~3 / 4 of the total length of the flexible test piece (7), and the remaining length of the flexible test piece (7) passing through the protective ring (1) is not greater than half of the cross-sectional length of the test section; before the start of the test, the flexible test piece (7) passes through the protective ring (1) and is freely drooped and placed at the lower edge of the protective ring (1); during the test, the blowing speed is gradually increased by slowly starting the machine, and under the action of aerodynamic resistance, the flexible test piece (7) is lifted and straightened, and performs a conical swinging motion in the protective ring (1); the vertical symmetry center line of the protective ring (1) is always located on the left and right symmetry plane of the test section, and no left and right adjustment is made in the horizontal direction, and only height adjustment is made in the vertical direction; S34. Design and process the protective ring (1); According to the diameter of the protective ring Φ1= (1.2~1.3) L 直径 , Guard ring thickness H =5.0mm, guard ring length L =15.0mm~20.0mm, using 30CrMnSiA to process the protection ring (1); S35. Design control systems; A total of three tensioning rope connection points (8) are set on the protection ring (1), namely, points A, B, and C, which are distributed in a triangle, and are defined as a three-point distribution in a triangle, wherein point A is the vertex of the protection ring (1), and points B and C are located at the lower part of the protection ring (1) and are symmetrically distributed on the left and right sides; the protection ring traction rope (3) connected to point A is set as an active tensioning rope (5), and the protection ring (1) is pulled up and down by a driving motor (4); the protection ring traction rope (3) connected to points B and C is set as a follow-up tensioning rope (6), and the follow-up tensioning rope (6) follows in a tensioned state and is not connected to the driving motor (4) for active control; S36. Select the drive motor (4) and the protective ring traction rope (3); The aerodynamic load of the protection ring (1) is obtained by CFD calculation, and the wire rope diameter Φ and the wire rope tension Fs are determined taking into account the aerodynamic interference; Then, according to Fs=9550×(P*i / n), select the drive motor (4); where Fs is the wire rope tension, P is the motor power, n is the motor speed, and i is the reduction ratio; S37. Establish the incoming flow Mach number Ma Table corresponding to the position of the guard ring (1); The closest distance between the circular trajectory of the conical pendulum and the lower wall of the wind tunnel obtained by S33 L 下限位置 , determine the position of the protection ring (1) and form the incoming flow Mach number Ma The position correspondence table of the protection ring (1) is input into the control system.

4. A test method for a flexible test piece high-speed wind tunnel protection device, which is used for the flexible test piece high-speed wind tunnel protection device according to claim 2, characterized in that: The test method comprises the following steps: S41. Integrate the control system of the protective device into the wind tunnel control system; Add a control system for protective devices to the wind tunnel control system, and add a control system interface for protective devices to the wind tunnel control system interface; S42. Determine the incoming flow Mach number Ma ; According to the wind tunnel test schedule, determine the Mach number of the first high-speed wind tunnel test and obtain the incoming flow Mach number. Ma , according to the incoming flow Mach number Ma Corresponding to the position table of the guard ring (1), determining the position of the guard ring (1); S43. Start the drive motor (4); The driving motor (4) is started, and the active tensioning rope (5) pulls the protection ring (1) up and down to the corresponding position. After it reaches the position, the driving motor (4) buzzer sounds to prompt that the position of the protection ring (1) is adjusted to the right position; S44. Locking protection ring (1); The active tension rope (5) and the two follower tension ropes (6) are all locked to achieve the position positioning of the protection ring (1), and a signal indicating that the position positioning of the protection ring (1) is completed is sent to the wind tunnel control system; S45. Conduct high-speed wind tunnel tests on flexible test pieces (7); The high-speed wind tunnel is started, the first high-speed wind tunnel test is completed, the Mach number of the second high-speed wind tunnel test is determined according to the wind tunnel test schedule, and the process returns to S42 until all high-speed wind tunnel tests at the test Mach numbers on the wind tunnel test schedule are completed.

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