Afterburner of engine

Abstract

The utility model relates to an engine afterburner which comprises an afterburner cylinder and a supporting structure, the supporting structure comprises at least one supporting ring and at least one pair of supporting blocks, one side of each supporting block is fixedly connected to the surface of the inner wall of the afterburner cylinder, and the other side of each supporting block is fixedly connected with the supporting ring. And a plurality of positioning holes are formed in the surface of the supporting ring. According to the technical scheme, the heat screen and the supporting ring are connected together through the bolt, the supporting ring and the supporting block jointly support the heat screen, and the gap is formed between the heat screen and the inner wall face of the afterburner, so that the heat transfer speed is slowed down, the heat flow impact force is reduced, and the local surface of an engine is prevented from being burnt.

Description

Technical Field

[0001] The utility model belongs to the technical field of aero engines, and particularly relates to an afterburning combustion device for an engine. Background Art

[0002] An afterburner is generally used in a military aviation jet engine and is located between a turbine and a tail nozzle. By performing secondary fuel injection combustion on the gas generated by a main combustion chamber and doing work through the turbine, additional higher thrust can be obtained. Since the gas inlet temperature of the afterburner reaches 950 - 1000K, the gas temperature can reach above 2000K after afterburning, and the afterburner usually operates for a short time. Therefore, not only the cooling at extremely high working temperatures needs to be considered, but also the thermal stress and thermal deformation of the cylinder body material when the afterburner is turned on and off need to be considered. In order to enable the afterburning combustion cylinder to dissipate heat as soon as possible, in the prior art, an appropriate heat insulation screen generally needs to be configured for the afterburner.

[0003] For example, the patent document with the publication number "CN103968418B" discloses a double - wall heat insulation screen for an afterburner, which includes a gas - side film - hole plate, a cold - air - side impact plate, and a trapezoidal strengthening frame; the gas - side film - hole plate is the inner wall of the afterburner cylinder body, and its inner side is the main gas duct of the afterburner. The cold - air - side impact plate and the outer wall surface form a cold - air duct, and there is a trapezoidal strengthening frame between the impact plate and the film - hole plate; the impact plate, the film - hole plate, and the trapezoidal strengthening frame form a double - wall heat insulation screen; adopting the technical solution of this patent, the cooling air forms a gas film on the inner wall of the gas side of the heat insulation screen, reducing the heat load and gas flow loss. The internal convective cooling and external gas - film cooling in the double - wall form a composite cooling, and the heat introduced is taken away through convective heat transfer, improving the utilization rate of cold air and the service life and reliability of its afterburner. However, in the above - mentioned patent technical solution, the heat insulation screen is integrally connected to the inner wall of the afterburner cylinder body, resulting in too fast heat energy transfer and large heat energy impact, which will cause burns to local parts of the engine. Summary of the Utility Model

[0004] To solve the above - mentioned technical problems, the utility model provides an afterburning combustion device for an engine.

[0005] The utility model provides an afterburning combustion device for an engine, which includes an afterburning combustion cylinder and a supporting structure. The supporting structure includes at least one retaining ring and at least a pair of supporting blocks. One side of the supporting block is fixedly connected to the inner wall surface of the afterburning combustion cylinder, and the other side of the supporting block is fixedly connected to the retaining ring. A plurality of positioning holes are provided on the surface of the retaining ring.

[0006] The positioning holes are arranged between adjacent pairs of supporting blocks.

[0007] The supporting blocks are arranged at equal intervals along the circumferential direction of the inner wall surface of the afterburning combustion cylinder.

[0008] Each pair of support blocks are arranged back to back in an I-shape, and each pair of support blocks are welded into one body.

[0009] The support block is U-shaped.

[0010] The front and rear ends of the afterburner tube are also fixedly connected to the flange ring respectively, and the positioning hole is also arranged on the surface of the flange ring.

[0011] The edge of the flange ring is provided with a plurality of guide grooves.

[0012] The afterburner cylinder is composed of a plurality of unit cylinders, which are arranged along the axial direction and are butted end to end in sequence to form a whole.

[0013] The inclination angle between the axial direction of at least one of the unit tubes and the axial direction of any other unit tube is 1° to 5°.

[0014] The number of the unit cylinders is three.

[0015] The beneficial effect of the utility model is that: by adopting the technical solution provided by the utility model, the heat insulation screen and the support ring are connected together by bolts, the support ring and the support block jointly support the heat insulation screen, and a gap is provided between the heat insulation screen and the inner wall surface of the afterburner tube, which slows down the heat energy transfer speed, reduces the impact force of the heat flow, and avoids burns on the local surface of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric drawing of the utility model;

[0017] Figure 2 It is the front view of the utility model;

[0018] Figure 3 It is a partial enlarged view of the flange ring of the utility model;

[0019] Figure 4 It is a partial enlarged view of the support structure of the utility model.

[0020] In the figure: 1-afterburner cylinder, 2-support structure, 3-flange ring, 11-unit cylinder, 21-support ring, 22-support block, 23-positioning hole, 31-guide groove. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings, but the protection scope required is not limited to the above;

[0022] The utility model provides an engine afterburner combustion device, such as Figures 1 to 4As shown in the figure, it includes an afterburner barrel 1 and a support structure 2. The support structure 2 includes at least one retaining ring 21 and at least a pair of support blocks 22. One side of the support block 22 is fixedly connected to the inner wall surface of the afterburner barrel 1, and the other side of the support block 22 is fixedly connected to the retaining ring 21. A plurality of positioning holes 23 are provided on the surface of the retaining ring 21.

[0023] Adopting the technical solution provided by the present utility model, the heat shield is connected to the retaining ring by bolts. The retaining ring and the support blocks jointly support the heat shield, and a gap is provided between the heat shield and the inner wall surface of the afterburner barrel, which slows down the heat transfer speed, reduces the heat flow impact force, and avoids the local surface of the engine from being burned.

[0024] Specifically, the positioning holes 23 are arranged between adjacent pairs of support blocks 22. The support blocks 22 are arranged at equal intervals along the circumferential direction of the inner wall surface of the afterburner barrel 1. Each pair of support blocks 22 is arranged back to back in an "I" shape, and each pair of support blocks 22 is welded into one body. The support block 22 is in a U shape. Thus, a stable support for the heat shield is formed by the retaining ring and the support blocks, enabling the heat shield to obtain accurate positioning accuracy during assembly and reducing the assembly error.

[0025] In addition, the front and rear ends of the afterburner barrel 1 are respectively fixedly connected to the flange ring 3, and the positioning holes 23 are also provided on the surface of the flange ring 3. A plurality of flow guiding grooves 31 are provided on the edge of the flange ring 3. The overall shape of the flow guiding grooves 31 is semi-circular. The heat shield is also connected to the flange ring 3 by bolts. The flange ring 3 also has an auxiliary supporting effect on the heat shield. The edge of the flange ring 3 is provided with flow guiding grooves 31, and the flow guiding grooves 31 increase the surface area of the flange ring 3, which helps to dissipate the heat energy through the flange ring 3.

[0026] In addition, the afterburner barrel 1 is composed of a plurality of unit barrels 11. The plurality of unit barrels are arranged along their axial directions and are sequentially butted end to end into one body. The inclination angle between the axis of at least one unit barrel 11 and the axis of any other unit barrel 11 is 1° to 5°, and preferably the number of unit barrels 11 is 3. The material of the retaining ring 21 is titanium alloy, and the material of the afterburner barrel 1 is titanium alloy.

Claims

1. An engine afterburner device, characterized in that: The invention comprises an afterburner tube (1) and a support structure (2), wherein the support structure (2) comprises at least one support ring (21) and at least one pair of support blocks (22), one side of the support block (22) is fixedly connected to the inner wall surface of the afterburner tube (1), and the other side of the support block (22) is fixedly connected to the support ring (21), and the surface of the support ring (21) is provided with a plurality of positioning holes (23).

2. An engine afterburner device as claimed in claim 1, characterized in that: The positioning hole (23) is arranged between two adjacent pairs of supporting blocks (22).

3. An engine afterburner device as claimed in claim 1, characterized in that: The support blocks (22) are arranged at equal intervals along the circumference of the inner wall surface of the afterburner cylinder (1).

4. An engine afterburner device as claimed in claim 1, characterized in that: Each pair of support blocks (22) are arranged back to back in an I-shape, and each pair of support blocks (22) are welded into one body.

5. An engine afterburner device according to any one of claims 1 to 4, characterized in that: The support block (22) is U-shaped.

6. An engine afterburner device as claimed in claim 1, characterized in that: The front and rear ends of the afterburner cylinder (1) are also respectively fixedly connected to the flange ring (3), and the positioning hole (23) is also arranged on the surface of the flange ring (3).

7. An engine afterburner device as claimed in claim 6, characterized in that: A plurality of guide grooves (31) are arranged on the edge of the flange ring (3).

8. An engine afterburner device as claimed in claim 1, 3 or 6, characterized in that: The afterburner cylinder (1) is composed of a plurality of unit cylinders (11), which are arranged along the axial direction thereof and are butted end to end in sequence to form a whole.

9. An engine afterburner device as claimed in claim 8, characterized in that: The inclination angle between the axial direction of at least one unit tube (11) and the axial direction of any other unit tube (11) is 1° to 5°.

10. An engine afterburner device as claimed in claim 8, characterized in that: The number of the unit cylinders (11) is three.

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