Deformable bulge air inlet channel structure

Abstract

The invention discloses a deformable bulge air inlet channel structure, and belongs to the field of aircraft air inlet channel structure design. The deformable bulge air inlet duct structure comprises an air inlet duct skin, a bearing frame structure and a driving device. The air inlet skin comprises a rigid skin, a flexible skin and a flexible honeycomb structure. The rigid skin is used for maintaining the aerodynamic configuration of the non-bulge area unchanged, and the flexible skin is used for achieving profile change of the air inlet bulge area. And the flexible honeycomb structure is used for supporting the flexible skin and changing the shape of the bulge under the pushing of the driving device, so that the pneumatic profile of the air inlet channel is adjusted under different flight conditions, and the pneumatic matching characteristics of the air inlet channel and the engine are improved. According to the design scheme of the flexible skin, pneumatic pressure can be effectively borne, and large out-of-plane deformation can be achieved. The supporting structure plays a good distributed supporting role, molded surface deformation can be directly and effectively controlled, the driving form is simple, and therefore high-precision adjustment of the molded surface of the bulge air inlet channel can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of aircraft air inlet structure design and proposes a deformable bulge air inlet structure. Background Art

[0002] As an important airflow regulating component of the engine, the aircraft air inlet is used to solve the contradiction between the high and low speed air intake requirements of the aircraft air inlet, so that the aircraft can obtain good launch matching performance in a wide speed range. The bulged air inlet uses the three-dimensional bulged surface on the side of the fuselage to guide the airflow, which can reduce air resistance, structural weight and occupied space, and has a good application prospect. However, the bulged air inlet is a fixed surface, and the air intake volume cannot be adjusted. At high Mach numbers, the conical shock wave and the end shock wave induced by the bulged compression surface interfere with the boundary layer, and the shock wave / boundary layer interference problem is serious, which affects the aerodynamic performance of the bulged air inlet. Aerodynamic research shows that the launch matching performance can be improved at different Mach numbers by deforming the bulged air inlet. Therefore, designing a deformable bulged air inlet structure is of great significance to the improvement of launch matching performance. Summary of the invention

[0003] The present invention provides a structure capable of realizing deformation of a bulged air inlet, which utilizes an actuator to drive a supporting structure to push a flexible skin to achieve deformation. Based on this purpose, the technical solution adopted by the present invention is as follows:

[0004] A deformable bulge air inlet structure comprises an air inlet skin, a bearing frame structure and a driving device.

[0005] Furthermore, the air inlet skin comprises a rigid skin 4, a flexible skin 5 and a flexible honeycomb structure 6. The rigid skin 4 is used to maintain the aerodynamic shape of the non-bulging area, and the flexible skin 5 is used to achieve the profile change of the air inlet bulging area. The flexible honeycomb structure 6 is used to support the flexible skin 5 and change the bulging shape under the drive of the driving device, so as to adjust the aerodynamic profile of the air inlet under different flight conditions to improve the aerodynamic matching characteristics of the air inlet and the engine.

[0006] Furthermore, the rigid skin 4 and the flexible skin 5 are fixed at their peripheral edges.

[0007] Furthermore, the flexible skin 5 is made of rubber, preferably super elastic silicone rubber.

[0008] Furthermore, the flexible honeycomb structure 6 is bonded to the inner side of the flexible skin 5 to enhance the bending stiffness of the flexible skin 5 so that the flexible skin 5 can withstand out-of-plane aerodynamic loads. Meanwhile, the flexible honeycomb structure 6 can generate out-of-plane deformation driven by external force.

[0009] Furthermore, the flexible honeycomb structure 6 is composed of a large rigid annular reinforcement 6.1 and a small rigid radial reinforcement 6.2. The annular reinforcement 6.1 provides overall support rigidity, and the radial reinforcement 6.2 provides local rigidity and can deform radially, so that the honeycomb has both large bending rigidity and can achieve large out-of-plane deformation. By designing the honeycomb density, the local rigidity is adjusted to reduce the local deformation caused by aerodynamic pressure.

[0010] Furthermore, the bearing frame structure includes a rigid annular bearing frame 3 and a drive device mounting frame 7, wherein the rigid annular bearing frame 3 is the main bearing structure of the air inlet region. The drive device mounting frame 7 and the rigid skin 4 are connected to the rigid annular bearing frame 3 by bolts, wherein the rigid skin 4 is located on the end face of the rigid annular bearing frame 3, and the drive device mounting frame 7 is fixed to the inner wall of the rigid annular bearing frame 3.

[0011] Furthermore, the driving device is composed of a driver 8 and a corresponding support structure 9. The support structure 9 includes a columnar support structure 9.1 and an umbrella-shaped support structure 9.2. The support structures 9 are fixed to the top of the driver 8, and the bottom end of the driver 8 is fixed to the driving device mounting frame 7. The travel direction of the driver 8 is parallel to the axial direction of the rigid annular bearing frame 3; the driver 8 can push the support structure 9 upward and drive the flexible honeycomb structure 6 and the flexible skin 5 to deform. The columnar support structure 9.1 acts on the maximum displacement position of the bulge of the flexible skin 5 to adjust the maximum deformation of the flexible skin 5. The other umbrella-shaped support structures 9.2 act on the position of the annular reinforcement 6.1 of the flexible honeycomb structure 6 to adjust the local deformation of the flexible skin 5. The umbrella-shaped support structure 9.2 plays a distributed support role, which can directly and effectively control the deformation of the profile, thereby realizing high-precision adjustment of the bulge inlet profile.

[0012] Furthermore, the number of the umbrella-shaped support structures 9.2 is set as required, and each umbrella-shaped support structure 9.2 includes a circular ring support and a radial support between the circular rings. Each umbrella-shaped support structure 9.2 is driven by an independent driver 8, and the umbrella-shaped support structure 9.2 with a smaller diameter is located above the umbrella-shaped support structure 9.2 with a larger diameter.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The design of the flexible skin in the present invention can effectively withstand aerodynamic pressure and achieve large out-of-plane deformation, and is an important structural component that can realize deformation bulging.

[0015] (2) The support structure of the present invention plays a good distributed support role, can directly and effectively control the deformation of the profile, and has a simple driving form, thereby achieving high-precision adjustment of the bulged inlet duct profile. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the aerodynamic layout of the aircraft bulge inlet;

[0017] Figure 2 is an axonometric view of the bulged air inlet of the present invention;

[0018] Figure 3 The flexible skin structure of the present invention;

[0019] Figure 4 The load-bearing frame structure and driving device of the present invention;

[0020] Figure 5 It is a schematic diagram of the installation of the driving device of the present invention;

[0021] Figure 6 It is a schematic diagram of the driver and umbrella-shaped support structure of the present invention.

[0022] In the figure: 1 is the aircraft air inlet profile; 2 is the air inlet outer cover; 3 is the rigid annular bearing frame; 4 is the rigid skin; 5 is the flexible skin; 6 is the flexible honeycomb structure; 6.1 is the annular reinforcement; 6.2 is the radial reinforcement; 7 is the drive device installation frame; 8 is the drive; 9 is the support structure; 9.1 is the columnar support structure; 9.2 is the umbrella-shaped support structure. DETAILED DESCRIPTION

[0023] In order to better illustrate a structure capable of realizing deformation of a bulged air inlet according to the present invention, the method of the present invention is further described in combination with the drawings and embodiments to make the technical solution and beneficial effects clearer.

[0024] The working principle of the present invention is:

[0025] A plurality of sets of drivers 8 are used to drive the support structure 9 to push the flexible skin 5 to realize active deformation of the bulging air inlet profile, so as to achieve the purpose of regulating and controlling the aircraft air inlet profile 1.

[0026] Embodiment 1:

[0027] like Figure 1 As shown, the bulge profile in the bulge inlet refers to the three-dimensional aerodynamic profile of the inlet, and the outer side is the inlet cover 2. By realizing the regulated deformation of the local deformation zone, the inlet matching performance at high Mach number can be improved.

[0028] According to the requirements of the aerodynamic layout design of the aircraft, the local area of ​​the air inlet skin has different aerodynamic shapes at low Mach numbers and high Mach numbers, which is defined as the bulge deformation area, and its shape is approximately an ellipsoid configuration. The deformable bulge air inlet structure consists of three parts: the air inlet skin, the bearing frame structure, and the drive device.

[0029] like Figure 2 As shown, the air inlet skin comprises a rigid skin 4, a flexible skin 5 and a flexible honeycomb structure 6. The rigid skin 4 is used to maintain the aerodynamic shape of the non-bulge area unchanged, and the flexible skin 5 is used to achieve the change of the air inlet profile. The flexible honeycomb structure 6 is used to support the flexible skin 5 and change the bulge shape under the drive of the driving device, so as to adjust the aerodynamic profile of the air inlet under different flight conditions to improve the aerodynamic matching characteristics of the air inlet and the engine.

[0030] like Figure 3 As shown, the rigid skin 4 is fixed to the peripheral edge of the flexible skin 5. The flexible honeycomb structure 6 is bonded to the inner side of the flexible skin 5 to enhance the bending stiffness of the flexible skin 5, so that the flexible skin 5 can withstand out-of-plane aerodynamic loads, and the flexible honeycomb structure 6 can be driven by external forces to produce out-of-plane deformation. The flexible honeycomb structure 6 is composed of a large annular reinforcement 6.1 and a small radial reinforcement 6.2. The annular reinforcement 6.1 provides overall support stiffness, and the radial reinforcement 6.2 provides local stiffness and can deform radially, so that the honeycomb has both large bending stiffness and can achieve large out-of-plane deformation. By designing the honeycomb density, the local stiffness is adjusted to reduce the local deformation caused by aerodynamic pressure.

[0031] The flexible honeycomb is a honeycomb made of aramid paper material.

[0032] like Figure 4 As shown, the bearing frame structure includes a rigid annular bearing frame 3 and a drive device mounting frame 7, wherein the rigid annular bearing frame 3 is the main bearing structure in the air inlet region. The drive device mounting frame 7 and the rigid skin 4 are connected to the rigid annular bearing frame 3 by bolts, wherein the rigid skin 4 is located on the end face of the rigid annular bearing frame 3, and the drive device mounting frame 7 is fixed to the inner wall of the rigid annular bearing frame 3.

[0033] like Figure 5As shown, the driving device is composed of more than four sets of drivers 8 and corresponding support structures 9. The support structure 9 includes a columnar support structure 9.1 and three umbrella-shaped support structures 9.2. The support structure 9 is fixed to the top of the driver 8 by bolts, and the bottom of the driver 8 is fixed to the driving device mounting frame 7. The travel direction of the driver 8 is parallel to the axial direction of the rigid annular bearing frame 3; the driver 8 can push the support structure 8 upward and drive the flexible honeycomb structure 6 and the flexible skin 5 to deform. The columnar support structure 9.1 acts on the center position of the bulge of the flexible skin 5 to adjust the maximum deformation of the flexible skin 5. The other umbrella-shaped support structures 9.2 act on the position of the annular reinforcement 6.1 of the flexible honeycomb structure 6 to adjust the local deformation of the flexible skin 5. Each umbrella-shaped support structure 9.2 includes a circular ring support and a radial support between the inside of the circular ring. Each umbrella-shaped support structure 9.2 is driven by an independent driver 8, and the umbrella-shaped support structure 9.2 with a small diameter is located above the umbrella-shaped support structure 9.2 with a large diameter. The umbrella-shaped support structure 9.2 plays a distributed supporting role, which can directly and effectively control the deformation of the profile, thereby achieving high-precision adjustment of the bulged air inlet duct profile.

[0034] Figure 6 9.2 is a typical drive structure and umbrella support structure.

[0035] The specific description above further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A deformable bulge air inlet structure, characterized in that: It includes air inlet skin, load-bearing frame structure and drive device.

2. The deformable bulge air inlet structure according to claim 1, characterized in that: The air inlet skin comprises a rigid skin (4), a flexible skin (5) and a flexible honeycomb structure (6); the rigid skin (4) is used to maintain the aerodynamic shape of the non-bulging area unchanged, and the flexible skin (5) is used to achieve the change of the profile of the air inlet bulging area; the flexible honeycomb structure (6) is used to support the flexible skin (5) and change the bulging shape under the drive of a driving device, so as to adjust the aerodynamic profile of the air inlet under different flight conditions, so as to improve the aerodynamic matching characteristics of the air inlet and the engine.

3. The deformable bulge air inlet structure according to claim 2, characterized in that: The rigid skin (4) is fixed to the outer peripheral edge of the flexible skin (5).

4. The deformable bulge air inlet structure according to claim 2, characterized in that: The flexible skin (5) is made of rubber, preferably superelastic silicone rubber.

5. The deformable bulge air inlet structure according to claim 2, characterized in that: The flexible honeycomb structure (6) is bonded to the inner side of the flexible skin (5) to enhance the bending stiffness of the flexible skin (5), so that the flexible skin (5) can withstand out-of-plane aerodynamic loads. At the same time, the flexible honeycomb structure (6) can generate out-of-plane deformation through external force.

6. A deformable bulge air inlet structure according to any one of claims 1 to 5, characterized in that: The flexible honeycomb structure (6) is composed of a large-rigidity annular reinforcement (6.1) and a small-rigidity radial reinforcement (6.2). The annular reinforcement (6.1) provides overall support stiffness, and the radial reinforcement (6.2) provides local stiffness and can deform radially, so that the honeycomb has both large bending stiffness and can achieve large out-of-plane deformation. By designing the honeycomb density, the local stiffness is adjusted to reduce the local deformation caused by aerodynamic pressure.

7. The deformable bulge air inlet structure according to claim 1, characterized in that: The bearing frame structure comprises a rigid annular bearing frame (3) and a drive device mounting frame (7), wherein the rigid annular bearing frame (3) is the main bearing structure of the air inlet region; the drive device mounting frame (7) and the rigid skin (4) are connected to the rigid annular bearing frame (3) by bolts, wherein the rigid skin (4) is located on the end face of the rigid annular bearing frame (3), and the drive device mounting frame (7) is fixed to the inner wall of the ring of the rigid annular bearing frame (3).

8. The deformable bulge air inlet structure according to claim 1, characterized in that: The driving device is composed of a driver (8) and a corresponding support structure (9); the support structure (9) includes a columnar support structure (9.1) and an umbrella-shaped support structure (9.2); the support structures (9) are fixed to the top of the driver (8), the bottom of the driver (8) is fixed to the driving device mounting frame (7), and the travel direction of the driver (8) is parallel to the axial direction of the rigid annular bearing frame (3); the driver (8) can push the support structure (9) upward and drive the flexible honeycomb structure (6) and the flexible skin (5) to deform; the columnar support structure (9.1) acts on the maximum displacement position of the bulge of the flexible skin (5) to adjust the maximum deformation of the flexible skin (5); the other umbrella-shaped support structures (9.2) act on the annular reinforcement (6.1) position of the flexible honeycomb structure (6) to adjust the local deformation of the flexible skin (5); the umbrella-shaped support structure (9.2) plays a distributed support role, which can directly and effectively control the deformation of the profile, thereby realizing high-precision adjustment of the profile of the bulge air inlet.

9. The deformable bulge air inlet structure according to claim 8, characterized in that: The number of the umbrella-shaped support structures (9.2) is set according to needs, and each umbrella-shaped support structure (9.2) includes a circular ring support and a radial support between the inside of the circular ring; each umbrella-shaped support structure (9.2) is driven by an independent driver (8), and the umbrella-shaped support structure (9.2) with a smaller diameter is located above the umbrella-shaped support structure (9.2) with a larger diameter.

Images