A shock wave inducer and method

Abstract

The invention discloses a shock wave inducer and method, comprising: a rotating wedge, a wedge support frame, a pull rod, a slider, a motor support frame, a first stepper motor, a first screw rod, a pillar, a sliding plate, a guide rail, a plate support frame, a base, a second stepper motor, and a second screw rod; an induced shock wave is generated by rotating the wedge, the wedge support frame, the pull rod, the slider, the first screw rod, and the first stepper motor; the shock wave incident position is controlled by the sliding plate, the plate support frame, the guide rail, the second screw rod, and the second stepper motor; the invention combines the stepper motor driving the rotating wedge and the stepper motor driving the guide rail plate, which not only has the continuous change of the shock wave angle and the controllable incident position, but also ensures that the pressure acquisition is significantly improved in time and space resolution, reflecting the high efficiency and reliability in the field of shock wave and boundary layer interference test research.

Description

Technical Field

[0001] The invention belongs to the technical field of super / hypersonic wind tunnel testing, and in particular relates to a shock wave inducer and a method. Background Art

[0002] Shock waves and their interference phenomena are widely present in the internal and external flow fields of super / hypersonic aircraft. Among them, the interference between shock waves and boundary layers has continued to attract scholars for more than half a century and is still a hot research direction. The results in this field have provided important theoretical and technical support for the innovative development of aerospace vehicles.

[0003] High-speed aircraft will inevitably induce shock wave structures during the flight process exceeding the speed of sound, and the interference between shock waves and components will cause more complex flow fields, bringing severe challenges to the field of high-speed aircraft aerodynamics. The shock wave interference flow field structure includes characteristics such as incident shock waves, reflected shock waves, expansion waves and separation shock waves. Deepening the understanding of the mechanism of such flow field structures plays an important role in guiding the design optimization of aircraft. In ground wind tunnel tests, one of the basic conditions for the study of shock waves and interference phenomena is the shock wave inducer, which can be designed according to the conditions such as the Mach number of the study. The traditional design method is partly a fixed-angle compression wedge, which needs to be reloaded when the angle is changed; the other part is a compression plate that rotates at a small angle, but the shock wave incident position is difficult to control. In addition, pressure measurement is one of the indispensable technical means in the field of shock wave and boundary layer interference research. The current technical capabilities can achieve high-frequency dynamic acquisition at the megahertz level, but the spatial resolution is usually insufficient; and when the spatial resolution is at the 1mm level, the acquisition frequency is limited to the kilohertz level. Therefore, the biggest problem with current pressure measurement technology is the contradiction between time resolution and spatial resolution. In the future, the requirements for pressure data in the field of shock wave and boundary layer interference experimental research will become increasingly higher. Therefore, it is very necessary to design a new type of shock wave inducer that has the ability to collect pressure with both high time resolution and spatial resolution. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a shock wave inducer and method to solve the problems in the prior art that the wedge compression angle cannot be continuous over a large range, the shock wave incident position cannot be controlled, and the pressure acquisition time / space resolution is low; the present invention combines a stepper motor driven rotating wedge and a stepper motor driven guide plate together, which not only has the continuous change of the shock wave angle and the controllable incident position, but also ensures that the pressure acquisition is significantly improved in time and space resolution, reflecting the high efficiency and reliability in the field of shock wave and boundary layer interference test research.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A shock wave inducer of the present invention comprises: a rotating wedge, a wedge support frame, a pull rod, a slider, a motor support frame, a first stepper motor, a first screw rod, a support, a sliding plate, a guide rail, a plate support frame, a base, a second stepper motor, and a second screw rod; wherein,

[0007] One end of the rotating wedge is rotatably connected to the wedge support frame, and the end is also connected to the slider through a pull rod, the slider is connected to the first stepper motor through a first screw rod, and the first stepper motor is fixedly connected to the motor support frame at one end close to the slider, and an induced shock wave is generated through the above components; the sliding plate is connected to the guide rail through the plate support frame, and the plate support frame is connected to the second stepper motor through a second screw rod, and the shock wave incident position is controlled through the above components;

[0008] A through hole is formed at one end of the base, and one end of the guide rail passes through the through hole and is fixedly connected to the flat plate support frame. The flat plate support frame is slidably arranged on the base, and the second stepping motor drives the second screw rod to drive the sliding plate to slide on the base;

[0009] The rotating wedge block is hinged to the wedge block support frame and connected to the base through a support column.

[0010] Preferably, both ends of the pull rod are hinged to the upper part of the rotating wedge and the sliding block respectively.

[0011] Preferably, a groove is formed on the surface of the wedge support frame.

[0012] Preferably, a first opening is formed on the top surface of the pillar, and one end of the top surface is inserted into the groove.

[0013] Preferably, a second opening is formed on a side surface of the support column for accommodating one end of the sliding plate.

[0014] Preferably, one end of the sliding block away from the rotating wedge is fixedly connected to the first screw rod.

[0015] Preferably, the sliding plate is fixedly connected to the plate support frame.

[0016] Preferably, the number of the guide rails is two.

[0017] Preferably, the support column is fixedly connected to the base.

[0018] Preferably, the support column can be moved up and down by adjusting the connection position with the base, so as to continuously adjust the starting height of the induced shock wave.

[0019] Preferably, a pressure sensor is provided on the sliding plate to dynamically measure the pressure along the shock wave interference flow field.

[0020] In the present invention, the first stepper motor drives the rotating wedge to deflect, so that the induced shock wave intensity can be dynamically and continuously adjusted; the second stepper motor drives the sliding plate to move, so that the induced shock wave incident position can be dynamically and continuously adjusted.

[0021] The two stepper motors in the present invention respectively drive the deflection of the rotating wedge and the movement of the flat plate, so that the induced shock wave intensity and the incident position can be continuously adjusted, thereby realizing high temporal and spatial resolution measurement of the pressure field.

[0022] A working method of a shock wave inducer of the present invention, based on the above shock wave inducer, comprises the following steps:

[0023] Step 1: According to the Mach number requirements of the applicable flow field, set the initial angle and the final angle of the angle between the bottom surface of the rotating wedge and the horizontal plane;

[0024] Step 2: According to the shock wave incident position of the flow field to be measured, set the initial position and the end position of the sliding plate;

[0025] Step 3: According to the test time, the rotation time of the rotating wedge from the initial angle to the final angle and the translation time of the sliding plate from the initial position to the final position are set;

[0026] Step 4: At the beginning of the test, the rotating wedge and the sliding plate move synchronously and coordinately to create the flow field required for the test.

[0027] Beneficial effects of the present invention:

[0028] The present invention adopts two stepper motors to drive the deflection of the rotating wedge and the movement of the sliding plate respectively. Through the coordinated control of the shock wave intensity and the incident position, the problem that the traditional shock wave inducer cannot continuously adjust the shock wave intensity and the incident position is solved. It also solves the contradictory problem that the time resolution and spatial resolution of pressure measurement cannot be improved at the same time, making the measurement of shock wave and boundary layer interference flow field more efficient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the shock wave inducer of the present invention from a first viewing angle.

[0030] Figure 2 This is a schematic structural diagram of the shock wave inducer of the present invention from a second viewing angle.

[0031] Figure 3 It is a schematic diagram of the deflection control of the rotating wedge in the present invention.

[0032] Figure 4 It is a schematic structural diagram of the first state of the shock wave inducer of the present invention.

[0033] Figure 5 It is a schematic structural diagram of the second state of the shock wave inducer of the present invention. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0035] Reference Figure 1 , Figure 2 As shown, a shock wave inducer of the present invention comprises: a rotating wedge 1, a wedge support frame 2, a pull rod 3, a slider 4, a motor support frame 5, a first stepper motor 6, a first screw rod 7, a support 8, a sliding plate 9, a guide rail 10, a plate support frame 11, a base 12, a second stepper motor 13, and a second screw rod 14; wherein,

[0036] The downstream end of the rotating wedge 1 is rotatably connected to the wedge support frame 2, and the end is also connected to the slider 4 through the pull rod 3, the slider 4 is connected to the first stepper motor 6 through the first screw 7, and the first stepper motor 6 is fixedly connected to the motor support frame 5 at one end close to the slider 4, and the induced shock wave is generated by the above components; the sliding plate 9 is connected to the guide rail 10 through the plate support frame 11, and the plate support frame 11 is connected to the second stepper motor 13 through the second screw 14, and the shock wave incident position is controlled by the above components;

[0037] A through hole is formed at one end of the base 12, and one end of the guide rail 10 passes through the through hole and is fixedly connected to the flat plate support frame 11. The flat plate support frame 11 is slidably disposed on the base 12. The second stepping motor 13 drives the second screw rod 14 to drive the sliding plate 9 to slide on the base 12.

[0038] The rotating wedge block 1 is hinged with the wedge block support frame 2 and connected to the base 12 through the pillar 8; a groove is provided on the surface of the wedge block support frame 2; a first opening is provided on the top surface of the pillar 8, and one end of the top surface is inserted into the groove; a second opening is provided on the side of the pillar 8 for accommodating one end of the sliding plate 9.

[0039] In a preferred example, both ends of the pull rod 3 are hinged to the upper portion of the downstream end of the rotating wedge block 1 and the slider 4 respectively.

[0040] In a preferred example, one end of the sliding block 4 away from the rotating wedge block 1 is fixedly connected to the first screw rod 7 .

[0041] In a preferred example, the sliding plate 9 is fixedly connected to the plate support frame 11 .

[0042] In a preferred example, the number of the guide rails 10 is two.

[0043] In a preferred example, the support column 8 is fixedly connected to the base 12 .

[0044] In a preferred example, a plurality of rows of screw holes (not shown in the figure) are arranged on the end surface where the pillar 8 is connected to the base 12, which can be connected to the screw holes provided on the wall surface of the base 12 by bolts. The height position of the wedge block can be moved up and down through the screw holes in different positions, that is, each row of screw holes corresponds to a height, and the starting height of the induced shock wave can be continuously adjusted.

[0045] In a preferred example, a pressure sensor is provided on the sliding plate 9 to dynamically measure the pressure along the shock wave interference flow field.

[0046] In the present invention, reference is made to Figure 3 As shown, the first stepper motor 6 drives the rotating wedge 1 to deflect, and the induced shock wave intensity can be dynamically and continuously adjusted from the initial setting angle to the end angle; Figure 4 , Figure 5 As shown, the sliding plate 9 is driven by the second stepping motor 13 to move from the initial position to the final position, so that the induced shock wave incident position can be dynamically and continuously adjusted.

[0047] The two stepper motors in the present invention respectively drive the deflection of the rotating wedge and the movement of the flat plate, so that the induced shock wave intensity and the incident position can be continuously adjusted, thereby realizing high temporal and spatial resolution measurement of the pressure field.

[0048] A working method of a shock wave inducer of the present invention, based on the above shock wave inducer, comprises the following steps:

[0049] Step 1: According to the Mach number requirements of the applicable flow field, set the initial angle and the final angle of the angle between the bottom surface of the rotating wedge and the horizontal plane;

[0050] Step 2: According to the shock wave incident position of the flow field to be measured, set the initial position and the end position of the sliding plate;

[0051] Step 3: According to the test time, the rotation time of the rotating wedge from the initial angle to the final angle and the translation time of the sliding plate from the initial position to the final position are set;

[0052] Step 4: At the beginning of the test, the rotating wedge and the sliding plate move synchronously and coordinately to create the flow field required for the test.

[0053] The present invention has many specific application paths. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A method for operating a shock wave inducer, the shock wave inducer comprising: A rotating wedge (1), a wedge support frame (2), a pull rod (3), a slider (4), a motor support frame (5), a first stepper motor (6), a first screw rod (7), a support column (8), a sliding plate (9), a guide rail (10), a plate support frame (11), a base (12), a second stepper motor (13), and a second screw rod (14); wherein one end of the rotating wedge (1) is rotatably connected to the wedge support frame (2), and the end is also connected to the slider (4) via the pull rod (3); the slider (4) is connected to the first stepper motor (6) via the first screw rod (7); the first stepper motor (6) is fixedly connected to the motor support frame (5) at one end close to the slider; an induced shock wave is generated by the above components; the sliding plate (9) is connected to the guide rail (10) via the plate support frame (11); the plate support frame (11) is connected to the second stepper motor (13) via the second screw rod (14); the shock wave incident position is controlled by the above components; the base (12) A through hole is formed at one end of the guide rail (10), one end of the guide rail (10) passes through the through hole and is fixedly connected to a flat plate support frame (11), the flat plate support frame (11) is slidably arranged on a base (12), and a second stepping motor (13) drives a second screw rod (14) and drives a sliding plate (9) to slide on the base (12); the rotating wedge (1) is hinged to the wedge support frame (2) and is connected to the base (12) through a support (8); the method is characterized in that it comprises the following steps: step 1: setting an initial angle and an end angle of an angle between a bottom surface of the rotating wedge and a horizontal plane according to the Mach number requirement of an applicable flow field; step 2: setting an initial position and an end position of the sliding plate according to the shock wave incident position of the flow field to be measured; step 3: setting a rotation time of the rotating wedge from an initial angle to an end angle and a translation time of the sliding plate from an initial position to an end position according to a test time; step 4: at the beginning of the test, the rotating wedge and the sliding plate move synchronously and coordinately to create a flow field required for the test.

2. The method according to claim 1, characterized in that The two ends of the pull rod (3) are respectively hinged to the upper part of the rotating wedge (1) and the sliding block (4).

3. The method according to claim 1, characterized in that A groove is provided on the surface of the wedge support frame (2).

4. The method according to claim 3, characterized in that The top surface of the support (8) is provided with a first opening, and one end of the top surface is inserted into the groove.

5. The method according to claim 1, characterized in that A second opening is provided on the side of the support column (8) for accommodating one end of the sliding plate (9).

6. The method according to claim 1, characterized in that One end of the sliding block (4) away from the rotating wedge (1) is fixedly connected to the first screw rod (7).

7. The method according to claim 1, characterized in that The number of the guide rails (10) is two.

8. The method according to claim 1, characterized in that The support (8) can be moved up and down by adjusting the connection position with the base (12), thereby continuously adjusting the starting point height of the induced shock wave.

9. The method according to claim 1, characterized in that: The sliding plate (9) is provided with a pressure sensor for dynamically measuring the pressure along the shock wave interference flow field.

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