Combustion chamber structure and liquid rocket engine

Abstract

The present invention discloses a combustion chamber structure and a combustion chamber of dissimilar metals, comprising a combustion chamber outer wall and a combustion chamber inner wall which are connected at both ends and provided with flow channels inside, and a connecting portion for fixing the combustion chamber outer wall and the combustion chamber inner wall. The connecting portion forms a convex rib between the combustion chamber inner wall and the combustion chamber outer wall. The combustion chamber outer wall is located on the outer side of the combustion chamber inner wall, and a plurality of first grooves are evenly provided along the circumferential inner surface of the combustion chamber outer wall, and a plurality of second grooves are provided along the circumferential outer surface of the combustion chamber inner wall to match the plurality of first grooves. The two ends of the connecting portion along the radial direction of the combustion chamber outer wall are respectively tightly attached to the first groove and the second groove inner wall so that the combustion chamber outer wall is connected to the combustion chamber inner wall. Between the combustion chamber inner wall and the combustion chamber outer wall, a cooling channel for the circulation of liquid and / or gas medium is formed between adjacent connecting portions. The structure has reasonable design and is easy to operate.

Description

Technical Field

[0001] The invention relates to the field of liquid rockets, and in particular to a combustion chamber structure and a liquid rocket engine. Background Art

[0002] Spacecraft engine technology has been rapidly upgraded with the development of the aerospace industry. As the main components of the engine, the combustion chamber and heat exchanger of the liquid rocket engine are key components for completing the propellant energy conversion and generating thrust. The combustion chamber and heat exchanger are composed of inner and outer walls respectively. Usually, the inner wall with grooves needs to be connected to the outer wall to bear pressure and the medium can flow through the grooves.

[0003] When the inner wall and the outer wall are connected, in order to take into account factors such as heat conduction, strength, and weight, when designing the combustion chamber, a structural design in which the inner wall is copper and the outer wall is steel, titanium, and other materials is usually adopted to meet the requirements of thermal protection, increased strength, and reduced weight. The traditional processing method is to process ribs on the outer side of the inner wall and connect the inner wall and the outer wall by brazing or diffusion welding. Since copper and titanium will undergo severe dissolution at high temperatures and the weldability of some titanium alloys (such as TA15, TC4, etc.) is poor, the difficulty of welding the inner and outer walls is increased, affecting the production efficiency of the combustion chamber.

[0004] Therefore, how to provide a combustion chamber structure of dissimilar metals with reasonable design, easy operation, stable structure and improved production efficiency is a problem to be solved at present. Summary of the invention

[0005] The purpose of the present invention is to provide a combustion chamber structure and a combustion chamber, which have the advantages of reasonable design, convenient operation, stable structure, and improved production efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A combustion chamber structure, comprising a combustion chamber outer wall and a combustion chamber inner wall, both ends of which are connected and have a flow channel inside, and a connecting portion for fixing the combustion chamber outer wall and the combustion chamber inner wall, wherein the connecting portion forms a convex rib located between the combustion chamber inner wall and the combustion chamber outer wall, wherein:

[0008] The outer wall of the combustion chamber is located on the outside of the outer wall of the combustion chamber, and a plurality of first grooves are evenly arranged along the circumferential inner surface of the outer wall of the combustion chamber, and a plurality of second grooves are arranged along the circumferential outer surface of the inner wall of the combustion chamber, which are respectively matched with the plurality of first grooves. The two ends of the connecting portion along the radial direction of the outer wall of the combustion chamber are respectively tightly attached to the inner walls of the first grooves and the second grooves to connect the outer wall of the combustion chamber with the inner wall of the combustion chamber; between the inner wall of the combustion chamber and the outer wall of the combustion chamber, a cooling channel for the circulation of liquid and / or gas medium is formed between adjacent connecting portions.

[0009] Furthermore, the outer wall of the combustion chamber includes an outer cylinder and an outer cone of an integrally formed design, the large end of the outer cone is connected to one end of the outer cylinder, and the small end of the outer cone is located on the side away from the outer cylinder; the inner wall of the combustion chamber includes an inner cylinder and an inner cone of an integrally formed design, the large end of the inner cone is connected to one end of the inner cylinder, and the small end of the inner cone is located on the side away from the inner cylinder.

[0010] Furthermore, a transition portion between the outer cylinder and the outer cone is a first curved arc structure.

[0011] Furthermore, the first slot includes a first inner slot body arranged along the axial direction of the outer cylinder and a first inner slot portion arranged along the generatrix of the outer cone portion, and the first inner slot body and the first inner slot portion are connected to each other.

[0012] Furthermore, along the radial direction of the outer cylinder, the outer shape of the first inner tank is a first T-shaped structure, and one end of the connecting portion along the radial direction of the outer cylinder is in close contact with the inner surface of the first T-shaped structure.

[0013] Furthermore, the transition portion between the inner cylinder and the inner cone is a second curved arc structure; the second slot includes a second outer slot body arranged along the axial direction of the inner cylinder and a second outer slot portion arranged along the busbar of the inner cone, and the second outer slot body and the second outer slot portion are connected to each other.

[0014] Furthermore, along the radial direction of the inner cylinder, the second outer tank body has an outer shape of a second T-shaped structure, and the other end of the connecting portion along the radial direction of the outer cylinder is in close contact with the inner surface of the second T-shaped structure.

[0015] Furthermore, the connecting portion includes a first long rib that matches the inner cylinder and the outer cylinder, a circular rib that matches the transition between the inner cylinder and the inner cone and between the outer cylinder and the outer cone, and a second long rib that matches the inner cone and the outer cone.

[0016] Furthermore, the connection parts at both ends of the outer wall of the combustion chamber are fixed to the outer wall of the combustion chamber by welding.

[0017] The present invention also provides a liquid rocket engine, which is prepared using any of the above-mentioned heterogeneous metal combustion chamber structures.

[0018] Compared with the prior art, the embodiments of the present invention have at least one of the following beneficial effects:

[0019] (1) The combustion chamber structure of the dissimilar metals is composed of an outer wall of the combustion chamber, an inner wall of the combustion chamber, and a connecting portion, and the two ends of the connecting portion along the radial direction of the outer wall of the combustion chamber are respectively tightly attached to the inner walls of the first slot and the second slot to connect the outer wall of the combustion chamber to the inner wall of the combustion chamber. The entire connection process can reduce welding, thereby reducing the disadvantage that the outer wall of the combustion chamber and the inner wall of the combustion chamber are not firmly connected due to the large amount of heat generated by welding, thereby making the connection between the outer wall of the combustion chamber and the inner wall of the combustion chamber tighter, the fixation is more firm, and the entire structure is stable.

[0020] (2) Since the two ends of the connection part are respectively in close contact with the inner walls of the first slot and the second slot to connect the outer wall of the combustion chamber to the inner wall of the combustion chamber, the installation and removal of the connection part are convenient, while ensuring that the outer wall of the combustion chamber and the inner wall of the combustion chamber are intact and can be reused. That is, when the outer wall of the combustion chamber and the inner wall of the combustion chamber need to be repaired separately, the connection part can be removed, thereby separating the outer wall of the combustion chamber from the inner wall of the combustion chamber, so that the outer wall of the combustion chamber and the inner wall of the combustion chamber can be accurately repaired and reused, which plays a role in saving costs.

[0021] (3) By evenly arranging a plurality of first grooves along the circumferential inner surface of the outer wall of the combustion chamber and arranging a plurality of second grooves along the circumferential outer surface of the inner wall of the combustion chamber that are respectively matched with the plurality of first grooves, the circumferential arrangement of the plurality of first grooves and the plurality of second grooves makes the force applied when the connecting part connects the outer wall of the combustion chamber with the inner wall of the combustion chamber more uniform, thereby preventing the outer wall of the combustion chamber and the inner wall of the combustion chamber from being deformed due to uneven force, thereby facilitating the safe use of the combustion chamber.

[0022] (4) The connecting portion forms convex ribs between the inner wall and the outer wall of the combustion chamber, and cooling channels are formed between adjacent convex ribs, which not only facilitate the circulation of liquid and / or gaseous media and ensure stable and uniform output of liquid and / or gaseous media, but also the low-temperature liquid and / or gaseous media can take away the heat from the surface of the combustion chamber after passing through the cooling channel, thereby ensuring normal use of the combustion chamber.

[0023] The whole device has the advantages of reasonable design, easy operation and improved production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 is a three-dimensional diagram of a combustion chamber of the present invention;

[0025] Attached Figure 2A schematic diagram of the structure of the connection between the combustion chamber outer wall, the combustion chamber inner wall and the connection part of the present invention;

[0026] Attached Figure 3 It is a schematic structural diagram of the first long rib, the circular rib and the second long rib of the present invention;

[0027] Attached Figure 4 A structural diagram of the welding of the combustion chamber outer wall, the combustion chamber inner wall and the connecting part of the present invention;

[0028] Attached Figure 5 A three-dimensional diagram of the inner wall of the combustion chamber of the present invention;

[0029] Attached Figure 6 It is a three-dimensional diagram of the outer wall of the combustion chamber of the present invention.

[0030] Description of reference numerals:

[0031] 1Inner wall of combustion chamber 2Inner wall of combustion chamber

[0032] 3Connection part 4First slot

[0033] 5 second slot 6 outer cylinder

[0034] 7 outer cone 8 inner cylinder

[0035] 9 inner cone 10 first long rib

[0036] 11 circular rib 12 second long rib DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention more clearly understood, the spirit of the contents disclosed by the present invention will be clearly explained with the accompanying drawings and detailed descriptions below. After understanding the embodiments of the contents of the present invention, any technician in the relevant technical field can change and modify the techniques taught by the contents of the present invention without departing from the spirit and scope of the contents of the present invention.

[0038] The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. In addition, elements / components with the same or similar reference numerals used in the drawings and embodiments are used to represent the same or similar parts.

[0039] The terms “first”, “second”, etc. used in this document do not particularly refer to an order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described with the same technical terms.

[0040] The directional terms used in this document, such as up, down, left, right, front or back, etc., are only used to refer to the directions of the drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0041] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0042] As used herein, "and / or" includes any or all combinations of the items described.

[0043] The terms "substantially" and "approximately" used herein are used to modify any quantity or error that may vary slightly, but these slight changes or errors do not change their essence. Generally speaking, the range of slight changes or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. Those skilled in the art should understand that the aforementioned values ​​can be adjusted according to actual needs and are not limited thereto.

[0044] Certain terms used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present application.

[0045] An embodiment of the present invention provides a combustion chamber structure. Figure 1 , Figure 2 , Figure 3 Figure 4 Figure 5 and Figure 6 As shown, the combustion chamber structure of this dissimilar metal comprises a combustion chamber outer wall 1 and a combustion chamber inner wall 2, which are connected at both ends and have flow channels inside, and a connecting portion 3 for fixing the combustion chamber outer wall 1 and the combustion chamber inner wall 2. The connecting portion 3 forms a convex rib between the combustion chamber outer wall 1 and the combustion chamber outer wall 2. The combustion chamber outer wall 1 is located on the outside of the combustion chamber outer wall 2, and a plurality of first grooves 4 are evenly arranged along the circumferential inner surface of the combustion chamber outer wall 1, and a plurality of second grooves 5 are arranged along the circumferential outer surface of the combustion chamber inner wall 2, respectively matching the plurality of first grooves 4. The two ends of the connecting portion 3 along the radial direction of the combustion chamber outer wall 1 are respectively tightly attached to the inner walls of the first grooves 4 and the second grooves 5 to connect the combustion chamber outer wall 1 and the combustion chamber inner wall 2. Between the combustion chamber inner wall 2 and the combustion chamber outer wall 1, a cooling channel for the circulation of liquid and / or gas medium is formed between adjacent connecting portions 3.

[0046] It should be noted that, in this embodiment, the combustion chamber outer wall 1 includes an outer cylinder 6 and an outer cone 7 of an integral design, the large end of the outer cone 7 is connected to one end of the outer cylinder 6, and the small end of the outer cone 7 is located away from the outer cylinder 6. The combustion chamber inner wall 2 includes an inner cylinder 8 and an inner cone 9 of an integral design, the large end of the inner cone 9 is connected to one end of the inner cylinder 8, and the small end of the inner cone 9 is located away from the inner cylinder 8.

[0047] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in order to facilitate the circulation of liquid and / or gaseous medium and reduce the impact pressure of liquid and / or gaseous medium on the transition part between the outer cylinder 6 and the outer cone 7, for example, the transition part between the outer cylinder 6 and the outer cone 7 is a first curved arc structure. The design of the first curved arc structure can increase the contact area of ​​the liquid and / or gaseous medium, thereby reducing the pressure on the surface of the first curved arc structure, and can prevent the transition part from deforming, thereby facilitating the circulation of liquid and / or gaseous medium. In order to cooperate with the first curved arc structure and ensure the smooth circulation of liquid and / or gaseous medium, for example, the transition part between the inner cylinder and the inner cone is designed as a second curved arc structure, and the liquid and / or gaseous medium flows through the gap between the first curved arc structure and the second curved arc structure.

[0048] In addition, in order to facilitate the installation of the connecting body 3, for example, the first groove 4 includes a first inner groove body arranged along the axial direction of the outer cylinder 6 and a first inner groove portion arranged along the busbar of the outer cone 7, and the first inner groove body and the first inner groove portion are connected to each other; the second groove 5 includes a second outer groove body arranged along the axial direction of the inner cylinder 8 and a second outer groove portion arranged along the busbar of the inner cone 9, and the second outer groove body and the second outer groove portion are connected to each other.

[0049] In this embodiment, in order to facilitate the fixing of the connecting body 3, the connecting body 3 is connected to the first groove 4 and the second groove 5. For example, the outer cylinder 6 is cut along the radial direction, the outer shape of the first inner groove body is a first T-shaped structure, and one end of the connecting part 3 along the radial direction of the outer cylinder 6 is tightly attached to the inner surface of the first T-shaped structure; the inner cylinder 8 is cut along the radial direction, the outer shape of the second outer groove body is a second T-shaped structure, and the other end of the connecting part along the radial direction of the outer cylinder 6 is tightly attached to the inner surface of the second T-shaped structure.

[0050] For further explanation, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, in order to facilitate the installation of the connecting part, for example, the connecting part 3 includes a first long rib 10 that matches the inner cylinder 8 and the outer cylinder 6 (the shapes of the two ends match the first inner groove body and the first outer groove body, for example, the shapes of the two ends match the first T-shaped structure and the second T-shaped structure, that is, the cross-section of the first long rib is I-shaped), a circular rib 11 that matches the transition part between the inner cylinder 8 and the inner cone 9 and the outer cylinder 6 and the outer cone 7 (because the transition part is an arc structure, for example, the two ends of the circular rib along the radial direction of the outer wall of the combustion chamber are a plurality of matching cylinders arranged in sequence, and the two ends of the matching cylinder include a plurality of supporting cylinders that are integrally formed with the matching cylinder and arranged in sequence, the diameter of the supporting cylinder is smaller than the matching cylinders at the two ends, and the matching cylinders at the two ends are respectively tightly attached to the inner surfaces of the first slot and the second slot, and the matching cylinders at the two ends can move freely in the first slot and the second slot respectively) and a second long rib that matches the inner cone 9 and the outer cone 7. In addition, for ease of use, for example, the second elongated rib and the first elongated rib may be designed to have the same shape.

[0051] It is worth noting that in actual use, in order to ensure that the connection part 3 between the outer wall 1 of the combustion chamber and the outer wall 2 of the combustion chamber is firmly fixed and prevented from detaching, for example, the connection part 3 at both ends of the combustion chamber outer wall 1 is fixed to the combustion chamber outer wall 1 by welding. In order to reduce the impact on the combustion chamber outer wall 1 during welding (the high temperature generated during welding causes the combustion chamber outer wall 1 to deform), for example, laser welding can be used, that is, a laser beam is used to weld the connection part 3 to the combustion chamber outer wall 1 along the circumferential outer surface of the combustion chamber outer wall. Since the connection part 3 at both ends of the combustion chamber outer wall 1 is welded to the combustion chamber outer wall 1, the connection part 3 between the combustion chamber outer wall 1 and the combustion chamber outer wall 2 can be prevented from falling off (the connection parts at both ends are equivalent to doors being welded and fixed, which can prevent the part of the connection part located inside from falling off). In order to further fix the connection part, for example, the connection part 3 at both ends of the combustion chamber inner wall 2 can also be fixed to the combustion chamber inner wall 2 by laser welding.

[0052] The present invention also provides a combustion chamber, which is prepared by using any of the above-mentioned combustion chamber structures of dissimilar metals.

[0053] The present invention also provides a liquid rocket engine, which is prepared using any of the above-mentioned heterogeneous metal combustion chamber structures.

[0054] Specifically, the combustion chamber structure of this dissimilar metal is composed of a combustion chamber outer wall 1, a combustion chamber outer wall 2 and a connecting portion 3, and the two ends of the connecting portion 3 along the radial direction of the combustion chamber outer wall 1 are respectively tightly attached to the inner walls of the first slot 4 and the second slot 5 to connect the combustion chamber outer wall 1 with the combustion chamber outer wall 2. The entire connection process can reduce welding, thereby reducing the disadvantage that the combustion chamber outer wall 1 and the combustion chamber inner wall 2 are not firmly connected due to the large amount of heat generated by welding, thereby making the connection between the combustion chamber outer wall 1 and the combustion chamber inner wall 2 tighter, more firmly fixed, and the entire structure more stable. In addition, when the combustion chamber outer wall 1 and the combustion chamber inner wall 2 are connected, it is not necessary to perform surface treatment on the combustion chamber outer wall 1 and the combustion chamber inner wall 2, thereby reducing the surface chemical and electrochemical treatment processes.

[0055] In addition, since the two ends of the connecting portion 3 are respectively in close contact with the inner walls of the first slot 4 and the second slot 5 to connect the outer wall 1 of the combustion chamber with the outer wall 2 of the combustion chamber, the installation and removal of the connecting portion 3 are convenient, and the outer wall 1 of the combustion chamber with the outer wall 2 of the combustion chamber can be ensured to be intact and can be reused. That is, when the outer wall 1 of the combustion chamber with the outer wall 2 of the combustion chamber needs to be repaired separately (when the outer wall 1 of the combustion chamber with the outer wall 2 of the combustion chamber with the outer wall 1 of the combustion chamber with the inner ...

[0056] In addition, by evenly arranging a plurality of first grooves 4 along the circumferential inner surface of the outer wall 1 of the combustion chamber and arranging a plurality of second grooves 5 which are respectively matched with the plurality of first grooves 4 along the circumferential outer surface of the inner wall 2 of the combustion chamber, the circumferential arrangement of the plurality of first grooves 4 and the plurality of second grooves 5 makes the force applied when the connecting portion 3 connects the outer wall 1 of the combustion chamber with the outer wall 2 of the combustion chamber more uniform, thereby preventing the outer wall 1 of the combustion chamber and the inner wall 2 of the combustion chamber from being deformed due to uneven force, which is beneficial to the safe use of the combustion chamber.

[0057] The connecting portion 3 forms a convex rib between the inner wall 2 of the combustion chamber and the outer wall 1 of the combustion chamber, and a cooling channel is formed between adjacent convex ribs, which not only facilitates the circulation of liquid and / or gaseous media and ensures stable and uniform output of liquid and / or gaseous media, but also the low-temperature liquid and / or gaseous media can take away the heat from the surface of the combustion chamber after passing through the cooling channel, thereby preventing the combustion chamber from being burned by high temperature.

[0058] In addition, this design reduces the thermal process of diffusion welding, brazing and other methods, avoiding the degradation of the performance of the inner wall material after high temperature. For example, the performance of copper material degrades after high temperature. In addition, this design can also realize the connection of the inner and outer wall sandwich structures of various alloys, especially for materials that are difficult to weld by traditional methods such as copper, titanium, niobium and tungsten. It should be noted that when the inner and outer walls are connected, the connection strength of the inner and outer wall sandwich is the parent material strength of the rib (connecting part). Therefore, by adopting the welding method of this design, even if the inner wall is a weaker material, the connection strength can be improved by selecting a stronger rib material, further expanding the range of choices for combustion chamber materials.

[0059] The whole device has the advantages of reasonable design, easy operation, stable structure and improved production efficiency.

[0060] The above description is only an illustrative specific implementation manner of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A combustion chamber structure, characterized in that: It comprises a combustion chamber outer wall and a combustion chamber inner wall which are connected at both ends and have flow channels inside, and a connecting part for fixing the combustion chamber outer wall and the combustion chamber inner wall, wherein the connecting part forms a convex rib between the combustion chamber inner wall and the combustion chamber outer wall, wherein: Intersecting along the radial direction of the combustion chamber outer wall, the combustion chamber outer wall is located outside the combustion chamber outer wall, and a plurality of first T-shaped slots opening toward the combustion chamber inner wall are evenly arranged along the circumferential inner surface of the combustion chamber outer wall, and the plurality of first T-shaped slots extend along the length direction of the combustion chamber outer wall; a plurality of second T-shaped slots respectively matched with the plurality of first T-shaped slots and opening toward the combustion chamber outer wall are arranged along the circumferential outer surface of the combustion chamber inner wall, and the plurality of second T-shaped slots extend along the length direction of the combustion chamber inner wall; The two ends of the connecting portion along the radial direction of the combustion chamber outer wall are respectively tightly attached to the inner walls of the first T-shaped slot and the second T-shaped slot to connect the combustion chamber outer wall with the combustion chamber inner wall; between the combustion chamber inner wall and the combustion chamber outer wall, a cooling channel for the circulation of liquid and / or gas medium is formed between adjacent connecting portions.

2. The combustion chamber structure according to claim 1, characterized in that: The outer wall of the combustion chamber includes an outer cylinder and an outer cone of an integrally formed design, the large end of the outer cone is connected to one end of the outer cylinder, and the small end of the outer cone is located on the side away from the outer cylinder; the inner wall of the combustion chamber includes an inner cylinder and an inner cone of an integrally formed design, the large end of the inner cone is connected to one end of the inner cylinder, and the small end of the inner cone is located on the side away from the inner cylinder.

3. The combustion chamber structure according to claim 2, characterized in that: The transition portion between the outer cylinder and the outer cone is a first curved arc structure.

4. The combustion chamber structure according to claim 2, characterized in that: The first T-shaped slot includes a first inner slot body arranged along the axial direction of the outer cylinder and a first inner slot portion arranged along the generatrix of the outer cone portion, and the first inner slot body and the first inner slot portion are communicated with each other.

5. The combustion chamber structure according to claim 4, characterized in that: The first inner tank is cut along the radial direction of the outer cylinder, and the outer shape of the first inner tank is a first T-shaped structure, and one end of the connecting portion along the radial direction of the outer cylinder is in close contact with the inner surface of the first T-shaped structure.

6. The combustion chamber structure according to claim 5, characterized in that: The transition portion between the inner cylinder and the inner cone is a second curved arc structure; the second T-shaped slot includes a second outer slot body arranged along the axial direction of the inner cylinder and a second outer slot portion arranged along the generatrix of the inner cone, and the second outer slot body and the second outer slot portion are connected to each other.

7. The combustion chamber structure according to claim 2, characterized in that: The connecting portion includes a first long rib that matches the inner cylinder and the outer cylinder, a circular rib that matches the transition between the inner cylinder and the inner cone and between the outer cylinder and the outer cone, and a second long rib that matches the inner cone and the outer cone.

8. The combustion chamber structure according to claim 7, characterized in that: The circular rib includes a plurality of supporting cylinders arranged in sequence and matching cylinders arranged at both ends of each of the supporting cylinders, and the matching cylinders are movably arranged in the first T-shaped slot and the second T-shaped slot.

9. The combustion chamber structure according to claim 1, characterized in that: The connection parts at both ends of the outer wall of the combustion chamber are fixed to the outer wall of the combustion chamber by welding.

10. A liquid rocket engine, characterized in that: A combustion chamber structure made of dissimilar metals as claimed in any one of claims 1 to 9 is used.

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