An impact injector cooling baffle

Abstract

The present invention discloses an impact injector cooling partition plate. It includes a main body cylinder and a plurality of side plates. A first interlayer is provided on the wall of the main body cylinder, and a first cooling medium channel is arranged in the first interlayer. The first cooling medium channel is distributed on the entire cylinder wall of the main body cylinder; the main body of each side plate is in a plate-like structure, and a second interlayer is provided in each side plate, and a second cooling medium channel is arranged in the second interlayer; each side plate is installed along the radial direction of the main body cylinder, and the cooling medium channels in the side plates communicate with the cooling medium channels on the wall of the main body cylinder; a fan-shaped area is formed between adjacent side plates. The cooling medium flow channels of the cooling partition plate of the present invention adopt a multi-in and multi-out structure form. The cooling medium enters from one side plate, flows through the circumferential partition plate, and finally flows out from the adjacent radial partition plate to achieve the purpose of cooling the partition plate.

Description

Technical Field

[0001] The present invention relates to an injector baffle, and particularly to a cooling baffle for an impinging injector. Background Art

[0002] The thrust chamber of an open-cycle liquid oxygen / kerosene engine has a working environment with remarkable characteristics of high temperature (~3600K), high pressure (>8MPa), and high heat flux density (~60MW / m 2 ).

[0003] The injector is a key component of the thrust chamber. Its main function is to inject, atomize, and mix the propellant components to ensure the high-efficiency and stable combustion of the engine, which plays a decisive role in the working performance and reliability of the engine.

[0004] Due to the large mass flow rate per second of the thrust chamber, the small structural size of the combustion chamber, and the short combustion distance of the propellant, the problem of combustion instability is very prominent. To suppress high-frequency combustion instability, large-size open-cycle liquid oxygen / kerosene engines adopt a six-nozzle baffle. The baffle is fixed on the injector face and extends into the high-temperature gas. During the working process, it is directly in contact with the high-temperature gas in the combustion chamber, and its reliable cooling must be ensured, otherwise it is easy to be ablated or even instantly burned out.

[0005] The existing technical approaches to achieve reliable cooling of the baffle mainly include: First, the baffle adopts baffle nozzles to enhance heat transfer through the regenerative cooling of kerosene, such as high flow velocity; second, the baffle uses copper alloy materials with high thermal conductivity; third, appropriate structural dimensions are selected, including a reasonable baffle height. For the baffle of a low-cost, open-cycle liquid oxygen / kerosene engine thrust chamber, to achieve low cost, the baffle material does not use high-strength copper alloy, but ordinary stainless steel, such as 1Cr18Ni9Ti, or superalloy; to simplify or brazing process, the baffle does not adopt baffle nozzles, but a solid-wall baffle with a sandwich regenerative cooling structure. Since the liquid oxygen / kerosene propellant has a more intense combustion process, a shorter combustion flame surface, and a combustion temperature about 200℃ higher under the same injector structure compared with propellants such as nitrogen tetroxide / unsymmetrical dimethylhydrazine, this makes the thermal environment of the baffle more severe and the baffle more prone to ablation. Summary of the Invention

[0006] In view of the defects or deficiencies of the prior art, the present invention provides a cooling baffle for an impinging injector.

[0007] To this end, the cooling baffle for an impinging injector provided by the present invention includes:

[0008] The main body cylinder, on the wall of which there is a first interlayer, and in the first interlayer there is a first cooling medium channel, and the first cooling medium channel is distributed on the entire cylinder wall of the main body cylinder; there are a plurality of first cooling medium circulation ports on the main body cylinder wall that communicate with the first cooling medium channel, and the plurality of first cooling medium circulation ports are distributed along the circumferential direction of the main body cylinder, and at the same time, each first cooling medium circulation port faces outside the main body cylinder;

[0009] A plurality of side plates, the main body of each side plate is a plate-like structure, and there is a second interlayer in each side plate, and a second cooling medium channel is arranged in the second interlayer; one end of each side plate is provided with a second cooling medium circulation port that communicates with the second cooling medium channel, and the other end is provided with a cooling medium inlet and outlet that communicates with the second cooling medium channel;

[0010] One side plate is installed at each first cooling medium circulation port, and the second cooling medium circulation port of the side plate is communicated with the corresponding first cooling medium circulation port, and at the same time, each side plate is installed along the radial direction of the main body cylinder; a fan-shaped area is formed between adjacent side plates;

[0011] The cooling medium enters the second cooling medium channel in the corresponding side plate through the cooling medium inlet and outlet on one side plate, and successively enters the first cooling medium channel through the corresponding second cooling medium circulation port and the first cooling medium circulation port, and then flows out through the cooling medium inlet and outlet of two adjacent side plates.

[0012] An optional solution is that the number of the side plates is a multiple of 3 and at least 6.

[0013] An optional solution is that the first cooling medium channel includes a plurality of channel A, and each channel A is arranged around the circumferential direction of the main body cylinder, and at the same time, the plurality of channel A are successively distributed along the axial direction of the main body cylinder, and the plurality of channel A are all communicated with the first cooling medium circulation port.

[0014] An optional solution is that the second cooling medium channel includes a plurality of channel B, and each channel B is arranged along the direction from the cooling medium inlet and outlet to the second cooling medium circulation port, and at the same time, the plurality of channel B are distributed along the axial direction of the main body cylinder, and the plurality of channel B are all communicated with the second cooling medium circulation port and the cooling medium inlet and outlet.

[0015] An optional solution is that there is a first buffer cavity between the cooling medium inlet and outlet and the second cooling medium circulation channel.

[0016] An optional solution is that there is a second buffer cavity between the second cooling medium circulation channel and the second cooling medium circulation port.

[0017] An optional solution is that a strengthening member is provided between the second cooling medium circulation channel and the second cooling medium inlet and outlet or in the second buffer cavity.

[0018] Alternatively, the main structure of the reinforcement member is adapted to the second buffer chamber. The main structure is provided with three sides around the axis, one side is the mounting surface, and the other two sides are each provided with a plurality of transition channels. The plurality of transition channels are axially distributed on the corresponding sides; the end where the two sides with transition channels intersect is a toothed structure; the reinforcement member is fixed to the main cylinder through the mounting surface; one end of each transition channel communicates with the first cooling medium circulation channel, and the other end communicates with the second cooling medium circulation channel. A further alternative is that the tooth end of the toothed structure is a sharp angle structure. The transition channel is arc-shaped.

[0019] Alternatively, a gap is left between the second cooling medium circulation channel and the reinforcement member.

[0020] Alternatively, a plurality of spray holes communicating with the first cooling medium circulation channel are opened on the main cylinder, and the spray holes are located near the first cooling medium circulation port.

[0021] Alternatively, each medium inlet and outlet is located at or near one end in the axial direction of the main cylinder to meet the installation and the requirements for the inlet, outlet and flow of the cooling medium.

[0022] Alternatively, the main cylinder includes an inner cylinder and an outer cylinder. The inner cylinder is located in the outer cylinder, and a first interlayer is formed between the inner cylinder and the outer cylinder; the side plate is composed of two plates, and the second interlayer is located between the two plates; and each plate is an integral structure with the outer cylinder at the corresponding part.

[0023] Alternatively, the main cylinder is made of stainless steel material, and the side plate is made of superalloy material.

[0024] Alternatively, the axial height of the main cylinder is greater than 80 mm, and the height dimension of each side plate in the axial direction of the main cylinder is the same as the axial height of the main cylinder; the radial dimension range of the main cylinder is 160 - 180 mm, and the overall radial dimension range of the cooling partition is 400 - 420 mm.

[0025] The cooling medium circulation channels of the cooling partition of the present invention adopt a multi-in and multi-out structure form. The cooling medium enters from one side plate, flows through the circumferential partition, and finally flows out from the adjacent radial partition to achieve the purpose of the cooling partition.

[0026] In the present invention, there is a "dead zone" formed by poor propellant flow in the intersection area between the side plate and the regenerative cooling channel of the main cylinder. Small spray holes with appropriate sizes are locally arranged in this area, and kerosene sprays out from the spray holes to strengthen the propellant flow in this area.

[0027] The main cylinder of the present invention can be made of stainless steel material, the side plate is made of superalloy material, and the partition is made of a combination of stainless steel and superalloy. The thermal conductivity coefficients of both stainless steel and superalloy are relatively low, which is 1 / 10 of that of copper alloy material. Brief Description of the Drawings

[0028] Figure 1 It is a schematic structural view of the cooling partition plate in the embodiment of the present invention;

[0029] Figure 2 It is a schematic view of the inlet and outlet directions of the cooling medium in the cooling partition plate of the embodiment of the present invention;

[0030] Figure 3 It is a schematic view of the distribution of the second cooling medium flow channels on the main body cylinder in the embodiment of the present invention;

[0031] Figure 4 It is a schematic structural view inside the side plate in the embodiment of the present invention;

[0032] Figure 5 It is a schematic structural view of the reinforcing member in the embodiment of the present invention;

[0033] Figure 6 It is a schematic structural view of the connection part between the side plate and the main body cylinder in the embodiment of the present invention. Detailed Embodiment

[0034] Unless otherwise specified, the scientific and technical terms in this article are understood according to the understanding of those of ordinary skill in the relevant fields.

[0035] The axial, radial, circumferential and other directional or azimuthal terms described in this article are consistent with the corresponding directions or azimuths in the drawings of the specification; it should be noted that the specific directions or azimuths in the drawings of the specification are intended to explain the clarity of the present invention, and those skilled in the art can make equivalent exchanges, rotations or inversion transformations based on the content disclosed in this article.

[0036] See Figure 1 As shown, the impact injector cooling partition plate of the present invention includes a main body cylinder 1 and a plurality of side plates 2; wherein,

[0037] A first sandwich layer is provided on the main body cylinder, and a first cooling medium channel is provided in the first sandwich layer. The first cooling medium channel is distributed on the entire cylinder wall of the main body cylinder; a plurality of first cooling medium flow ports 4 communicating with the first cooling medium channel are provided on the main body cylinder wall, and the plurality of first cooling medium flow ports are distributed along the circumferential direction of the main body cylinder, and at the same time, each first cooling medium flow port faces outside the main body cylinder;

[0038] The main body of each side plate is a plate-like structure, and a second sandwich layer is provided inside each side plate. A second cooling medium channel is provided in the second sandwich layer. The second cooling medium channel is distributed inside the entire side plate; one end of each side plate is provided with a second cooling medium flow port communicating with the second cooling medium channel, and the other end is provided with a cooling medium inlet and outlet 3 communicating with the second cooling medium channel;

[0039] A side plate is installed at each first cooling medium flow port, and the second cooling medium flow port of the side plate communicates with the corresponding first cooling medium flow port. At the same time, each side plate is installed along the radial direction of the main body cylinder; a fan-shaped area is formed between adjacent side plates;

[0040] Combined with Figure 2 As shown, the cooling medium enters the second cooling medium channel in the corresponding side plate through the cooling medium inlet and outlet on one side plate, and sequentially enters the first cooling medium channel through the corresponding second cooling medium flow port and the first cooling medium flow port, and then flows out through the cooling medium inlet and outlet of two adjacent side plates on both sides. In a specific solution, common fixing methods such as welding can be used to connect between components.

[0041] During use, the cooling partition plate of the present invention is fixed on the injector surface to suppress high-frequency combustion instability and extends into the high-temperature gas. During the working process, it is directly in contact with the high-temperature gas in the combustion chamber. The cooling medium kerosene enters from the medium inlet and outlet of two non-adjacent side walls, and then flows out from the cooling medium inlet and outlet of the two adjacent side plates on both sides. During the flowing process, the main body cylinder and the corresponding side plates are cooled, thereby avoiding ablation.

[0042] In some solutions, the main body cylinder includes an inner cylinder and an outer cylinder. The inner cylinder is located in the outer cylinder, and a first interlayer is formed between the inner cylinder and the outer cylinder; the side plate is composed of two plates, and the second interlayer is located between the two plates; and each plate is an integral structure with the corresponding part of the outer cylinder; that is, the outer cylinder of the main body cylinder is composed of multiple cylinder walls, and each outer cylinder wall and the side plates on both sides thereof are an integral structure.

[0043] In a specific solution, the number of side plates needs to meet the working requirements of the device. For example, the number of side plates is a multiple of 3 and at least 6. Figure 1 and 2 As shown in the device, there are 6 side plates, which divide the outer peripheral area of the main body cylinder into multiple fan-shaped areas. During work, 6 side plates have 3 inlets and 3 outlets.

[0044] In a specific solution, the first cooling medium channels on the main body cylinder wall need to be distributed on the entire wall of the main body cylinder to ensure complete cooling. One of its specific layout methods can be seen in Figure 3 As shown, multiple channels A5 are provided in the first interlayer. Each channel surrounds the main body cylinder, and multiple channels A are distributed along the axial direction of the main body cylinder. The cooling medium can flow in the second interlayer along multiple channels A to cool the main body cylinder wall and related areas. The second cooling medium channels in the side plate interlayer are distributed in this side plate. One of its specific layout methods can be seen in Figure 4 As shown, multiple channels B7 are provided in the second interlayer. Each channel B is arranged along the radial direction of the main body cylinder, and multiple channels B are distributed along the axial direction of the main body cylinder in the second interlayer; after the cooling medium enters the side wall, it flows through the side plate through multiple channels to cool the side plate and related areas.

[0045] To reduce the flow velocity of the cooling medium within the cooling partition and improve the uniformity of the cooling medium flow channels, in some solutions, a buffer chamber 6 is provided between the cooling medium inlet / outlet on the side plate and the second cooling medium flow-through channel. A buffer chamber can also be provided between the second cooling medium flow-through channel and the second cooling medium inlet / outlet (or the first cooling medium inlet / outlet).

[0046] To enhance the connection strength at the connection part between the main body cylinder and the side plate, a reinforcing member 8 is provided within the second flow-through channel and the second cooling medium flow port or within the second buffer chamber. The main body structure of the reinforcing member is adapted to the space in this area. One specific structure is as Figure 5 shown. The main body structure of this reinforcing member is provided with three sides around its axis. One side C is the mounting surface, and multiple transition channels 51 are provided on the other two sides. The multiple transition channels are axially distributed on the corresponding sides; the reinforcing member is fixed to the main body cylinder through the mounting surface; one end of each transition channel communicates with the first cooling medium flow-through channel, and the other end communicates with the second cooling medium flow-through channel. The other end opposite to the C surface (or the end where the two sides provided with the transition channels intersect) is a toothed structure 52, facing the side plate, and there are transition channels between adjacent teeth, realizing the transfer of the flow-through channels within the side plate and the main body cylinder; in a further preferred solution, the tooth end is a sharp corner structure, reducing local flow resistance loss. In a preferred solution, the transition channel is arc-shaped, enabling the cooling medium to smoothly pass through the buffer area and enter the first interlayer.

[0047] In some other preferred solutions, referring to Figure 4 shown, a certain gap L is left between the second cooling medium flow-through channel and the reinforcing member. The purpose is to reduce the flow velocity of the cooling medium after it flows out of the second cooling medium flow-through channel, playing a role in flow equalization. Take L = 1 - 2 mm.

[0048] In another preferred solution, referring to Figure 6 the schematic diagram shown, there is a "dead zone" formed by poor flow of the cooling medium in the intersection area between the side plate 2 and the main body cylinder 1. Spray holes 9 are locally provided in this area. The optional range of the hole diameter is ΦA = 0.8 - 1.5 mm, as Figure 6 shown, to strengthen the propellant flow. In a preferred solution, the axis of the spray hole forms a certain angle with the diameter direction of the main body cylinder at its location. The purpose is to make the cooling medium adhere to the wall after spraying from the small hole, forming a coolant film on the wall surface of the circumferential partition 1, cooling the partition. The optional range of the angle a is 60° - 80°.

[0049] In a specific solution, the size of the cooling partition of the present invention can be determined according to the use and installation environment. In common use scenarios, the axial height of the main body cylinder of the cooling partition of the present invention is greater than 80 mm, and the height dimension of each side plate in the axial direction of the main body cylinder is the same as the axial height of the main body cylinder; the radial dimension range of the main body cylinder is 160 - 180 mm, and the overall radial dimension range of the cooling partition is 400 - 420 mm.

Claims

1. An impact injector cooling partition plate, characterized in that, Comprising: A main body cylinder (1) with a first interlayer provided on the wall thereof, and a first cooling medium channel provided in the first interlayer. The first cooling medium channel is distributed throughout the entire cylinder wall of the main body cylinder; a plurality of first cooling medium circulation ports are provided on the main body cylinder wall and communicate with the first cooling medium channel, and the plurality of first cooling medium circulation ports are distributed along the circumferential direction of the main body cylinder, and at the same time, each first cooling medium circulation port faces outward of the main body cylinder; A plurality of side plates (2), each side plate having a plate-like structure as the main body, and a second interlayer provided in each side plate, and a second cooling medium channel provided in the second interlayer; one end of each side plate is provided with a second cooling medium circulation port communicating with the second cooling medium channel, and the other end is provided with a cooling medium inlet and outlet communicating with the second cooling medium channel; One side plate is installed at each first cooling medium circulation port, and the second cooling medium circulation port of the side plate is communicated with the corresponding first cooling medium circulation port, and at the same time, each side plate is installed along the radial direction of the main body cylinder; a fan-shaped area is formed between adjacent side plates; The cooling medium enters the second cooling medium channel in the corresponding side plate through the cooling medium inlet and outlet on one side plate, sequentially enters the first cooling medium channel through the corresponding second cooling medium circulation port and the first cooling medium circulation port, and then flows out through the cooling medium inlet and outlet of two adjacent side plates on both sides.

2. The impinging injector cooling separator according to claim 1, wherein The number of the side plates is a multiple of 3 and at least 6.

3. The impinging injector cooling baffle according to claim 1, characterized in that The first cooling medium channel includes a plurality of channels A, and each channel A is arranged around the circumferential direction of the main body cylinder, and at the same time, the plurality of channels A are sequentially distributed along the axial direction of the main body cylinder, and the plurality of channels A are all communicated with the first cooling medium circulation port.

4. The impinging injector cooling baffle according to claim 1, wherein The second cooling medium channel includes a plurality of channels B, and each channel B is arranged along the direction from the cooling medium inlet and outlet to the second cooling medium circulation port, and at the same time, the plurality of channels B are distributed along the axial direction of the main body cylinder, and the plurality of channels B are all communicated with the second cooling medium circulation port and the cooling medium inlet and outlet.

5. The impinging injector cooling baffle according to claim 1, wherein A first buffer cavity is provided between the cooling medium inlet and outlet and the second cooling medium circulation channel.

6. The impinging injector cooling baffle according to claim 1, characterized in that, A second buffer cavity is provided between the second cooling medium circulation channel and the second cooling medium circulation port.

7. The impinging injector cooling partition plate according to claim 6, wherein A reinforcing member is provided between the second cooling medium circulation channel and the second cooling medium inlet and outlet or in the second buffer cavity.

8. The impinging injector cooling baffle according to claim 7, wherein The main structure of the reinforcing member is adapted to the second buffer cavity. The main structure is provided with three side faces around the axial direction, one of the side faces is an installation face, and the other two side faces are both provided with a plurality of transition channels, and the plurality of transition channels are distributed along the axial direction on the corresponding side faces; the end where the two side faces provided with the transition channels intersect is a toothed structure; the reinforcing member is fixed on the main body cylinder through the installation face; one end of each transition channel is communicated with the first cooling medium circulation channel, and the other end is communicated with the second cooling medium circulation channel.

9. The impinging injector cooling partition plate according to claim 8, characterized in that, The tooth end of the toothed structure is a sharp angle structure.

10. The impinging injector cooling partition plate according to claim 8, wherein The transition channel is arc-shaped.

11. The impinging injector cooling baffle according to claim 6, wherein, A gap is left between the second cooling medium circulation channel and the reinforcing member.

12. The impinging injector cooling baffle according to claim 1, characterized in that, A plurality of spray holes communicating with the first cooling medium circulation channel are opened on the main body cylinder, and the spray holes are located near the first cooling medium circulation port.

13. The impinging injector cooling partition plate according to claim 12, wherein The axial direction of the spray hole is inclined with respect to the diameter of the main body cylinder where the spray hole is located.

14. The impinging injector cooling baffle according to claim 12, wherein, The aperture of the spray hole is φ0.8~φ1.5mm.

15. The impinging injector cooling baffle according to claim 1, characterized in that, Each medium inlet and outlet is located at or near one end in the axial direction of the main body cylinder.

16. The impinging injector cooling baffle according to claim 1, characterized in that, The main body cylinder includes an inner cylinder and an outer cylinder. The inner cylinder is located within the outer cylinder, and a first interlayer is formed between the inner cylinder and the outer cylinder. The side plate is composed of two plates, and a second interlayer is located between the two plates. Each plate and the outer cylinder at the corresponding part are of an integral structure.

17. The impinging injector cooling partition plate according to claim 1, characterized in that, The main body cylinder is made of stainless steel material, and the side plate is made of superalloy material.

18. The impinging injector cooling partition plate according to claim 1, wherein The axial height of the main body cylinder is greater than 80 mm. The height dimension of each side plate in the axial direction of the main body cylinder is the same as the axial height of the main body cylinder. The radial dimension range of the main body cylinder is 160 - 180 mm, and the overall radial dimension range of the cooling partition plate is 400 - 420 mm.

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