A double-layered flapped gas film cooling inner cone structure

Abstract

The present application provides a double-layered flapped gas film cooling inner cone structure. The inner cone structure includes: an outer cone layer with a pointed cone structure, and several circles of gas film cooling holes are arranged on the wall surface of the outer cone layer near the large end along the air flow direction; an inner cone layer adapted to the shape of the outer cone layer, the inner cone layer is arranged inside the outer cone layer and has a gap with the outer cone layer to form a folded-back channel, and the front end of the inner cone layer has a plurality of circumferentially distributed openings. The air flow flowing into the interior of the inner cone layer can flow into the folded-back channel from the openings and flow out from the gas film cooling holes, so as to form a gas film on the outer wall surface of the outer cone layer. The inner cone structure provided by the present application forms a double-layered flapped channel through the inner and outer cones, realizing the structure of high pressure against high pressure and low pressure against low pressure for the inner and outer layers of the cone, thereby effectively avoiding the problem of uneven distribution of cooling gas and improving the infrared stealth performance of the inner cone.

Description

Technical Field

[0001] This application belongs to the technical field of aeroengines, and particularly relates to a double-layer baffle film cooling inner cone structure. Background Art

[0002] With the increasing requirements for the rear-view radar and infrared stealth performance of aircraft and engines, the traditional single-layer full cone ( Figure 1 as shown in Figure a) or truncated cone structure ( Figure 1 as shown in Figure b) of the inner cone has no stealth design, and its rear-view radar detectability is relatively large, which can no longer meet the stealth requirements.

[0003] Therefore, there is an urgent need for a new structure of the inner cone to improve the rear-view radar and infrared stealth performance of the inner cone. Summary of the Invention

[0004] The purpose of this application is to provide a double-layer baffle film cooling inner cone structure to solve the problem that the inner cone in the afterburner chamber in the prior art has a high temperature and cannot effectively reduce the rear-view radar and infrared detectability.

[0005] The technical solution of this application is: a double-layer baffle film cooling inner cone structure, and the inner cone structure includes:

[0006] The outer layer of the cone with a pointed cone structure, and several circles of film cooling holes are arranged on the wall surface of the outer layer of the cone near the large end along the air flow direction;

[0007] The inner layer of the cone, the inner layer of the cone is arranged inside the outer layer of the cone and has a gap with the outer layer of the cone to form a return channel. The front end of the inner layer of the cone has a plurality of circumferentially distributed openings, and the air flow flowing into the inside of the inner layer of the cone can flow into the return channel from the openings and flow out from the film cooling holes, so as to form a film on the outer wall surface of the outer layer of the cone.

[0008] Further, a stop structure is arranged on the inner side of the large end of the outer layer of the cone. The inner layer of the cone includes an inner wall of the cone, and the large end of the inner wall of the cone is adapted to the stop structure, and is fixedly connected to the inner layer of the cone by a connecting member passing through the stop structure of the outer layer of the cone.

[0009] Further, the stop structure is in an L shape.

[0010] Further, a guiding tip extends along the reverse air flow direction from the center of the inner side of the tip of the outer layer of the cone. The inner layer of the cone includes a cone support fixed at the front end of the inner wall of the cone, and the cone support has a guiding tube, and the guiding tube has a guiding channel adapted to the diameter of the guiding tip.

[0011] Further, the guiding tip is a cylindrical structure.

[0012] Furthermore, the guiding tip is slidably connected to the guiding tube.

[0013] Furthermore, the opening is located on the cone support.

[0014] Furthermore, the opening is fan-shaped.

[0015] Furthermore, the inner layer of the cone further includes a plurality of channel holding brackets fixed to the inner wall of the cone, and the plurality of channel holding brackets form several circles of support structures for supporting the outer layer of the cone.

[0016] Furthermore, the channel holding bracket has a trapezoidal structure, the bottom end of the trapezoidal structure is fixedly welded to the inner wall of the cone, and the top end of the trapezoidal structure supports the outer layer of the cone.

[0017] The inner cone structure provided by the present application forms a double-layered folded-flow channel through the inner and outer cones, realizing a structure in which the high pressure of the outer and inner layers of the cone discharges gas with high pressure against high pressure and low pressure against low pressure, thereby effectively avoiding the problem of uneven distribution of cooling gas and improving the infrared stealth performance of the inner cone. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions provided by the present application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application.

[0019] Figure 1 Schematic diagrams of the full cone and truncated cone structures of the inner cone in the afterburner combustion chamber in the prior art.

[0020] Figure 2 Schematic diagram of the outer layer structure of the cone in the present application.

[0021] Figure 3 For Figure 2 Partial enlarged view of part I in

[0022] Figure 4 Schematic diagram of the overall structure of the outer layer of the cone in the present application.

[0023] Figure 5 Schematic diagram of the inner layer structure of the cone in the present application.

[0024] Figure 6 Schematic diagram of the cone support structure in the present application.

[0025] Figure 7 Schematic diagram of the channel holding bracket structure in the present application.

[0026] Figure 8 Schematic diagram of the inner cone structure after the outer layer of the cone and the inner layer of the cone are installed in the present application.

[0027] Figure 9Schematic diagram of the installation position of the support ring in an embodiment of the present application. Detailed implementation manners

[0028] To make the purpose, technical solutions, and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.

[0029] In view of the infrared stealth cooling problem of the cone in the afterburner chamber, the present application designs an inner cone structure that realizes the high-pressure to high-pressure and low-pressure to low-pressure gas outlet of the outer and inner layers of the cone through a double-layer cone baffle method, thus effectively avoiding the problem of uneven distribution of cooling gas.

[0030] The inner cone structure provided by the present application is mainly composed of an outer cone layer 1 and an inner cone layer 2, and the outer cone layer 1 is connected to the inner cone layer 2 by bolts.

[0031] As Figures 2 to 4 shown, the outer cone layer 1 is generally a pointed cone structure, and its cross-section gradually decreases along the air flow direction, so as to effectively reduce the detectability of the rear-view radar. A plurality of circles of film cooling holes 13 are arranged near the outer wall of the large end of the outer cone layer 1, and the plurality of circles of film cooling holes 13 are arranged along the axis direction of the inner cone structure. Through the film cooling holes 13, a gas film can be formed on the outer wall surface of the outer cone layer 1, thereby effectively reducing the wall temperature of the outer wall surface of the outer cone layer 1 and achieving the reduction of the rear-view infrared detectability of the inner cone. At the same time, the outer cone layer 1 and the outer cone ring (not shown) adapted to it together form a wide-pressure channel for decelerating and expanding the high-speed air flow in the afterburner chamber.

[0032] A guiding tip 11 extends forward (i.e., the air flow direction) from the center of the inner side of the cone end of the outer cone layer 1, and the guiding tip 11 is configured as a cylindrical structure. A stop structure 12 is provided on the inner side of the large end of the outer cone layer 1, and the stop structure 12 is an L-shaped structure. The outer cone layer 1 and the inner cone layer 2 are cooperatively installed through the stop structure 12.

[0033] As Figures 5 to 7 shown, the inner cone layer 2 mainly includes an inner cone wall 21, a cone support 22, and a channel holding bracket 23.

[0034] The shape of the inner cone wall 21 is substantially the same as that of the outer cone layer 1. The large end of the inner cone wall 21 is adapted to the stop structure 12 and has a plurality of bolt holes arranged circumferentially. The inner cone layer 2 and the inner cone layer 1 are fixedly connected together by bolts passing through the bolt holes. The inner cone layer 2 and the outer cone layer 1 together form a baffle-shaped cooling flow path, so that the cooling gas forms a high-pressure to high-pressure and low-pressure to low-pressure gas outlet form.

[0035] The cone support 22 is generally conical in shape, and a plurality of openings 221 are provided on the conical structure. The plurality of openings 211 are evenly distributed around the axis of the cone support 22. In a preferred embodiment of the present application, the shape of the opening 221 is fan-shaped to provide a relatively large opening area. At the front end of the conical structure, a guiding tube 222 extends outward along the axis. The guiding tube 222 has a through guiding channel 223 inside. The cone support 22 is fixedly welded to the front end of the inner wall 21 of the cone, and together with the inner wall 21 of the cone, it forms the main structure of the inner layer of the cone, which is used to support and guide the inner layer of the cone. The guiding channel 223 of the guiding tube 222 cooperates with the guiding tip 11 of the outer layer 1 of the cone, thereby playing a role in centering the inner layer 1 of the cone. In the present application, there is no limiting mechanism in the axial direction between the guiding tube 222 and the guiding tip 11, and the two can slide relative to each other.

[0036] There are a plurality of channel holding brackets 23, which are welded to the outer wall surface of the inner layer 2 of the cone, thereby forming a support structure in one or more circles, which is used to ensure that the cooling channels between the inner layer 2 of the cone and the inner layer 1 of the cone are maintained at a certain height, and at the same time improve the structural strength of the inner and outer layers of the cone. In the present application, the channel holding bracket 23 is generally trapezoidal in shape. The bottom end of the trapezoidal structure is welded to the inner layer 2 of the cone, and the top end of the trapezoidal structure supports the outer layer 1 of the cone. In a preferred embodiment of the present application, a through hole 233 is provided on the top plane of the trapezoidal structure of the channel holding bracket 23. After the inner layer 2 of the cone and the outer layer 1 of the cone are installed, the height from the channel holding bracket 23 to the wall surface of the inner cone 21 of the cone can be measured through the through hole 233 to prevent interference during the assembly of the inner and outer layers.

[0037] As Figure 8 shown, when the inner cone structure is in use, the air flow flows in from the large end of the inner cone structure. When the air flow reaches the conical front end of the inner layer 1 of the cone, it flows into the channel between the inner layer 1 of the cone and the outer layer 2 of the cone along the opening 221 of the cone support 22, and circulates along the reverse direction, and finally flows out from the film cooling holes 13 of the outer layer 1 of the cone.

[0038] As Figure 9 shown, in a preferred embodiment of the present application, the inner cone structure further includes one or more support rings 3. The length of the one or more support rings 3 is adapted to the diameter of one or more cross-sections in the axial direction of the inner layer 2 of the cone. The inner layer 2 of the cone is supported by the support rings 3 to prevent the inner layer 1 of the cone from collapsing and deforming inward.

[0039] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A double-layer baffle air film cooling inner cone structure, characterized in that, The inner conical structure includes: The outer layer of the conical body with a pointed cone structure. A plurality of circles of film cooling holes are arranged on the wall surface of the outer layer of the conical body near the large end along the air flow direction. The inner layer of the conical body is arranged inside the outer layer of the conical body and has a gap with the outer layer of the conical body to form a return channel. The front end of the inner layer of the conical body for air inflow has a plurality of circumferentially distributed openings. The air flow flowing into the inside of the inner layer of the conical body can flow into the return channel from the openings and flow out from the film cooling holes, so as to form a film on the outer wall surface of the outer layer of the conical body.

2. The double-layer baffle air film cooling inner cone structure according to claim 1, characterized in that, A stop structure is arranged on the inner side of the large end of the outer layer of the conical body. The inner layer of the conical body includes an inner wall of the conical body. The large end of the inner wall of the conical body is adapted to the stop structure, and is fixedly connected to the inner layer of the conical body by a connecting piece passing through the stop structure of the outer layer of the conical body.

3. The double-layer baffled gas film cooling inner cone structure according to claim 2, characterized in that, The stop structure is in an L shape.

4. The double-layer baffle air film cooling inner cone structure according to claim 2 or 3, characterized in that A guiding tip extends along the reverse air flow direction from the center of the inner side of the tip of the outer layer of the conical body. The inner layer of the conical body includes a conical support fixed at the front end of the inner wall of the conical body. The conical support has a guiding tube, and the guiding tube has a guiding channel adapted to the diameter of the guiding tip.

5. The double-layer baffle air film cooling inner cone structure according to claim 4, wherein The guiding tip is a cylindrical structure.

6. The double-layer baffle air film cooling inner cone structure according to claim 4, characterized in that, The guiding tip is slidably connected to the guiding tube.

7. The double-layer baffle air film cooling inner cone structure according to claim 4, characterized in that, The openings are located on the conical support.

8. The double-layer baffle air film cooling inner cone structure according to claim 7, characterized in that, The openings are fan-shaped.

9. The double-layer baffle air film cooling inner cone structure according to claim 2, characterized in that, The inner layer of the conical body further includes a plurality of channel holding brackets fixed on the inner wall of the conical body. The plurality of channel holding brackets form several circles of support structures for supporting the outer layer of the conical body.

10. The double-layer baffle air film cooling inner cone structure according to claim 9, characterized in that, The channel holding bracket is in a trapezoidal structure. The bottom end of the trapezoidal structure is welded and fixed to the inner wall of the conical body, and the top end of the trapezoidal structure supports the outer layer of the conical body.

Images