Sliding type hypersonic air inlet deflation flow adjusting device

Abstract

The invention provides a sliding type deflation flow adjusting device for a hypersonic air inlet channel. The device mainly comprises a deflation cavity, a sliding plate, a driving device, a sliding rail and a sliding block. The sliding plate is fixed to the sliding block and connected with the driving device, and the driving device works to drive the sliding plate to move front and back on the sliding rail, so that the opening of the sliding plate and the outlet of the deflation cavity are staggered, and then the deflation flow of the air inlet channel is adjusted. The device is simple in structure, small in size, convenient to install on a model, small in needed driving force due to the fact that the moving direction is perpendicular to the aerodynamic force direction, and capable of conducting large-range, multi-speed, continuous and flexible adjustment and control on the deflation flow of the hypersonic speed air inlet channel. And a reliable and flexible experimental device is provided for deflation flow control of the hypersonic air inlet channel.

Description

Technical Field

[0001] The invention relates to the field of hypersonic inlet aerodynamic experiments, in particular to a sliding hypersonic inlet bleed flow rate regulating device. Background Art

[0002] The hypersonic inlet is the main compression component of the scramjet engine, and its performance has an important impact on the operation of the propulsion system. In order to improve the compression capacity of the inlet without affecting its working efficiency, many flow control methods have been proposed, one of which is bleed, or flow leakage. This method sets multiple holes or grooves at specific positions to discharge a portion of the low-energy fluid from the inner channel, thereby achieving flow balance adjustment while suppressing shock wave / boundary layer interference. By increasing the bleed flow rate, the working range of the inlet can be effectively expanded, while improving its working performance. This is a common flow control method in engineering. However, this method affects the thrust generated by the propulsion system. At the same time, the fluid discharged by the bleed will also produce bleed resistance, which greatly affects the performance of the aircraft.

[0003] In order to resolve this contradiction, the bleed volume can be adjusted to obtain better performance. During the take-off phase, the outlet is opened to release excess flow so that the inlet can work normally; during the cruise phase, the outlet is closed so that the propulsion system can obtain greater thrust; and as the flight state changes, the bleed volume can be adjusted continuously and quickly in real time, so that the aircraft can maintain high performance in a wide range of flight speeds. However, the space inside a hypersonic aircraft is very limited, the working environment is harsh, the aerodynamic force is large, and the geometric constraints on the mechanical mechanism are strong. Commonly used transmission mechanisms such as four-bar linkages are also greatly restricted in actual engineering applications because of their proneness to dead points, poor reliability, large operating space, occupying the position of other equipment, and insufficient torque in the face of large aerodynamic resistance.

[0004] Therefore, a new technical solution is needed to solve the above problems. Summary of the invention

[0005] To solve the above problems, the present invention provides a sliding hypersonic inlet bleed flow regulating device, which has a simple structure, small size, and is easy to install on a model. At the same time, it is almost unaffected by aerodynamic forces and can perform large-range, multi-speed, continuous and flexible regulation and control of the bleed flow of the hypersonic inlet.

[0006] Technical solution: A sliding hypersonic inlet bleed flow regulating device, comprising: a plurality of bleed cavities, a sliding plate, a driving device connected to the sliding plate, a slider connected to the sliding plate, and a slide rail for the slider to move forward and backward; the bleed cavities are arranged in sequence from front to back and are independent of each other, and a bleed cavity outlet is provided at the bottom of each bleed cavity; the sliding plate is arranged close to the bleed cavity outlet, and the sliding plate has a plurality of openings and baffles located between two adjacent openings, and the forward and backward movement of the sliding plate causes the openings and / or baffles to be located below the bleed cavity outlet, thereby changing the discharge area of ​​the bleed cavity outlet.

[0007] Furthermore, the slide rail includes a long slide rail and two short slide rails; the long slide rail and the two sliders thereon are arranged at the bottom of one side of the sliding plate along the front-to-back direction, and the short slide rail and the sliders thereon are arranged at the bottom of the other side of the sliding plate along the front-to-back direction.

[0008] Furthermore, a displacement sensor is provided between the two short slide rails along the front-to-back direction, and a limit block is provided on the side of the slide rail, including a front limit block and a rear limit block.

[0009] Furthermore, a plurality of openings and baffles are provided in the middle of the sliding plate, and the total area of ​​the openings is greater than or equal to the total area of ​​the outlet of the deflation cavity.

[0010] Furthermore, the sliding plate is connected to the driving device, the sliding plate is fixed on the sliding block, and the driving device operates to drive the sliding plate to move forward and backward on the sliding rail.

[0011] Furthermore, the driving distance of the driving device is greater than the outlet width of the air inlet venting cavity.

[0012] Furthermore, the sliding plate is also provided with a displacement sensor connection block, which is placed on the front side of the sliding plate and is perpendicular to the surface of the sliding plate.

[0013] Furthermore, when the front limit block is in close contact with the slider, the front limit of the displacement sensor is triggered, and the sliding plate moves to the frontmost position; when the rear limit block is in close contact with the slider, the rear limit of the displacement sensor is triggered, and the sliding plate moves to the rearmost position.

[0014] Furthermore, the top plane of the slider is parallel to the surface of the sliding plate; the placement direction of the slide rail, the driving direction of the driving device and the movement direction of the sliding plate are the same.

[0015] Furthermore, when the sliding plate moves to the rearmost position, the sliding plate opening is located below the outlet of the venting chamber, and the discharge area is the largest; when the sliding plate moves to the frontmost position, the sliding plate baffle is located below the outlet of the venting chamber, and the discharge area is the smallest.

[0016] Beneficial effects: The present invention has the following significant effects: 1. The present invention has a simple structure and a small size: the flow regulating device of the present invention can adapt to a small space and can be directly installed in the air inlet, which is convenient for aircraft design; 2. The present invention has a strong regulating ability: the present invention can adjust the bleed flow in a variety of ways, adjust the speed arbitrarily, and flexibly control a wide range from fully open to fully closed; 3. The present invention has low control difficulty: since the movement direction of the sliding plate in the present invention is perpendicular to the aerodynamic force generated by the bleed, only a small driving force is required to achieve regulation and control, which provides a practical regulating device for the bleed flow control of the hypersonic inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an assembly diagram of the device of the present invention;

[0018] Figure 2 is a partial assembly diagram of the bracket of the present invention;

[0019] Figure 3 is an assembly diagram of the drive device of the present invention;

[0020] Figure 4 is a sliding plate assembly diagram of the present invention;

[0021] Figure 5 is a cross-sectional view of the present invention;

[0022] Figure 6 is a pressure variation curve in the air intake venting cavity during continuous movement of the embodiment of the present invention;

[0023] Figure 7 It is a curve of pressure variation in the deflation cavity of the air intake passage during stage movement of the embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Please combine Figures 1 to 5 , the embodiment of the sliding type hypersonic inlet bleed flow device of the present invention is explained. It includes a support part 1, a driving device 2, and a sliding plate device 3; the sliding plate 32 on the sliding plate device 3 is provided with a rectangular opening of the same shape and size as the outlet of the bleed cavity of the inlet 4, and the top plane of the sliding plate is in contact with the outlet of the bleed cavity. The sliding plate 3 is pulled forward and backward on the support 1 by the driving motor 21 to change the outlet area of ​​the inlet bleed cavity to realize the control of the bleed flow.

[0026] The bracket part 1 is generally in the shape of a hollow "mouth", and slide rails 12 and corresponding sliders 13 are arranged on both sides of the front end 11 of the bracket along the x direction, wherein the right side is a longer slide rail 121 and the left side is separately provided with two identical slide rails 122 and 123, and a displacement sensor 15 is placed in the gap, and a limit block 14 is placed close to the slide rail 12 to limit the movement of the slider 13; the rotary stepper motor 21 of the drive motor part 2 is installed on the front beam of the bracket 11 through the motor frame 22, and the motor shaft is fixed to the motor connecting block 23 through the matching nut along the x-axis direction, and is connected to the sliding plate part 3 by bolts; the main body of the sliding plate part 3 is a sliding plate 32, and the slide rail connecting block 31 is arranged at its four corners corresponding to the slider 13 and fixed with bolts, and in addition, a displacement sensor connecting block 33 is arranged in the middle of the left side, which is connected to the displacement sensor 15 to provide real-time feedback of the moving distance.

[0027] In the above-mentioned flow regulating device, it is necessary to ensure that the upper plane of the slider 13 is parallel to the movement plane of the sliding plate 32, that is, they are both parallel to the xz plane; at the same time, the placement direction of the slide rail 12, the motor axis direction of the rotating stepper motor 21 and the movement direction of the sliding plate 32 are the same, that is, they are all along the x-axis direction to ensure smooth movement of the device.

[0028] In the above flow control device, please combine Figure 5 The adjustment method of the sliding plate 32 is as follows: the rotating stepping motor 21 is started, and the motor shaft drives the sliding plate 23 to translate forward and backward along the x-axis through the nut and the motor connecting block 23, and is misaligned with the outlet of the air inlet venting cavity, thereby controlling the venting flow rate.

[0029] In the above-mentioned flow regulating device, when the sliding plate 32 is located at the rearmost position, the sliders 131 and 134 at the front end are close to the limit blocks 141 and 144, triggering the rear limit. At this time, the leakage area is the largest and the deflation flow is the largest; when the sliding plate 32 is located at the frontmost position, the sliders 132 and 133 at the rear end are close to the limit blocks 142 and 143, triggering the front limit. At this time, the leakage area is the smallest and the deflation flow is the smallest.

[0030] For the present invention, an experimental method is used to verify the effect of the above technical solution. In this embodiment, the device of the present invention is applied to a hypersonic inlet with a design Mach number of 6.0. Five rectangular openings of the same size and arranged at equal intervals along the x direction are provided in the middle of the sliding plate of the flow regulating device, which completely correspond to the shape, position and size of the outlet of the venting cavity of the hypersonic inlet with a Mach number of 6.0. The experiment was carried out under the wind tunnel condition of a Mach number of 3.8 at the inlet entrance.

[0031] like Figure 6As shown, this embodiment shows the pressure change curve in the deflation cavity of the air inlet when the device of the present invention moves continuously. When the total pressure of the wind tunnel flow remains unchanged, the higher the pressure, the smaller the flow rate. As can be seen from the figure, as the regulating device moves continuously at a certain speed, the pressure in the cavity also increases linearly, indicating that under the regulation of the device of the present invention, the deflation flow rate of the air inlet decreases linearly until the deflation flow rate is zero, resulting in the air inlet not starting.

[0032] like Figure 7 As shown, this embodiment gives a pressure change curve in the exhaust cavity of the air inlet when the device of the present invention moves in stages. As can be seen from the figure, as the regulating device moves in stages, the pressure in the cavity also rises in stages, indicating that the exhaust flow rate can be directly changed in different ways by changing the movement of the regulating device, reflecting the characteristics of the wide range and multi-speed flexible regulation of the regulating method of the present invention.

[0033] The above only describes the preferred embodiments of the present invention, which should not be construed as limiting the claims. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A sliding hypersonic inlet bleed flow regulating device, Features: The invention comprises a plurality of independent deflation chambers, a sliding plate, a driving device connected to the sliding plate, a slider connected to the sliding plate and a sliding rail for the slider to move forward and backward; the plurality of deflation chambers are arranged in sequence from front to back, and a deflation chamber outlet is provided at the bottom of each deflation chamber; the sliding plate is arranged close to the deflation chamber outlet, and the sliding plate is provided with a plurality of openings and a baffle plate between two adjacent openings; the driving device drives the sliding plate to move forward and backward, so that the opening and / or the baffle plate of the sliding plate are located below the deflation chamber outlet, thereby changing the discharge area of ​​the deflation chamber outlet.

2. The inlet venting flow regulating device according to claim 1, It is characterized in that The slide rails include a long slide rail and two short slide rails; the long slide rail and the two sliders thereon are arranged at the bottom of one side of the slide plate along the front-rear direction, and the short slide rail and the sliders thereon are arranged at the bottom of the other side of the slide plate along the front-rear direction.

3. The inlet venting flow rate regulating device according to claim 2, It is characterized in that A displacement sensor is arranged between the two short slide rails along the front-to-back direction, and a limit block is also arranged on the side of the slide rail, including a front limit block and a rear limit block.

4. The inlet venting flow regulating device according to claim 3, It is characterized in that A plurality of openings and baffles are arranged in the middle of the sliding plate, and the total area of ​​the openings is greater than or equal to the total area of ​​the outlet of the air release cavity.

5. The inlet duct bleed air flow regulating device according to claim 4, It is characterized in that The sliding plate is connected to the driving device, and the sliding plate is fixed on the sliding block. The driving device drives the sliding plate to move forward and backward on the sliding rail.

6. The intake duct bleed air flow regulating device according to claim 5, It is characterized in that The driving distance of the driving device is greater than the outlet width of the air inlet venting cavity.

7. The intake duct bleed air flow regulating device according to claim 6, It is characterized in that The sliding plate is also provided with a displacement sensor connection block, which is placed on the front side of the sliding plate and is perpendicular to the surface of the sliding plate.

8. The intake duct bleed air flow regulating device according to claim 7, It is characterized in that When the front limit block is in close contact with the slider, the front limit of the displacement sensor is triggered, and the sliding plate moves to the frontmost position; when the rear limit block is in close contact with the slider, the rear limit of the displacement sensor is triggered, and the sliding plate moves to the rearmost position.

9. The inlet venting flow rate regulating device according to claim 8, It is characterized in that The top plane of the slider is parallel to the surface of the sliding plate; the placement direction of the slide rail, the driving direction of the driving device and the movement direction of the sliding plate are the same.

10. The intake duct bleed air flow regulating device according to claim 9, It is characterized in that When the sliding plate moves to the rearmost position, the sliding plate opening is located below the outlet of the deflation chamber, and the discharge area is the largest; when the sliding plate moves to the frontmost position, the sliding plate baffle is located below the outlet of the deflation chamber, and the discharge area is the smallest.

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