Visual combustion chamber with body cooling function and rocket engine with visual combustion chamber

Abstract

The invention belongs to the field of combustion chambers, and particularly relates to a visual combustion chamber with a body cooling function and a rocket engine thereof, and the visual combustion chamber comprises a combustion chamber body, an observation window and a window temperature control structure; the combustion chamber body comprises an injection assembly mounting wall, a cylindrical side wall and a spray pipe assembly mounting wall which are arranged in sequence, and a combustion cavity is defined by the injection assembly mounting wall, the cylindrical side wall and the spray pipe assembly mounting wall; the observation window is arranged on the side wall of the cylindrical side wall; the window temperature control structure comprises a cooling gas film outlet channel used for spraying a cooling gas film from the upstream end of the observation window to carry out temperature control on the inner wall of the observation window, and a cooling gas film outlet channel used for spraying a propellant film to assist flame combustion in the combustion cavity. And a double-layer gas film is formed with the cooling gas film to assist the cooling gas film to carry out temperature control on the inner wall of the observation window to form a propellant gas film outlet channel. The temperature of the observation window can be obviously reduced on the basis that the flame combustion effect in the combustion cavity is improved.

Description

Technical Field

[0001] The invention belongs to the field of combustion chambers, and in particular relates to a visualized combustion chamber with body cooling and a rocket engine thereof. Background Art

[0002] In the face of the continuous development of liquid rocket engines and the demand for high-performance, high-reliability, lightweight and reusable engines, it is urgent to obtain the combustion flow field parameters of liquid rocket engines more comprehensively. The combustion flow field structural characteristics, combustion chamber temperature and pressure are key physical parameters. By analyzing the pressure oscillation and flow characteristics inside important components such as the combustion chamber, pipelines, and injectors, the engine design can be better guided.

[0003] In ground tests, the combustion chamber of traditional liquid rocket engines is often fully enclosed, and the combustion flow field structure cannot be observed. The understanding of combustion phenomena mainly relies on indirect measurement and computational simulation, lacking intuitive and powerful data, which limits the in-depth understanding of the combustion mechanism and is not conducive to the analysis and control of combustion stability. High-frequency combustion instability may induce large-value pressure oscillations, which seriously threatens the reliability of the engine. At the same time, it is impossible to diagnose and prevent possible faults, which increases the difficulty of engine design optimization and limits the improvement of combustion chamber performance. Therefore, a combustion chamber with a visual observation window has been developed for the combustion chamber of liquid rocket engines. Therefore, a camera can be used to observe the structural characteristics of the combustion flow field through the observation window. However, after long-term use, it is found that the service life of the observation window is much lower than the service life of the combustion chamber body. The main reason is that the observation window is affected by the high-temperature flame, which greatly reduces its service life. Therefore, there is an urgent need for a combustion chamber with strong overall performance of a rocket engine. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a visual combustion chamber with body cooling and a rocket engine thereof which can improve the combustion effect and ensure the temperature control of the observation window.

[0005] The present invention provides a visual combustion chamber with body cooling, comprising a combustion chamber body, an observation window and a window temperature control structure; The combustion chamber body comprises an injection assembly installation wall, a cylindrical side wall and a nozzle assembly installation wall which are arranged in sequence, and the injection assembly installation wall, the cylindrical side wall and the nozzle assembly installation wall enclose a combustion chamber; The observation window is arranged on the side wall of the cylindrical side wall, and is used to observe the combustion condition of the flame in the combustion chamber; The window temperature control structure includes a cooling air component and a propellant component. The cooling air component includes a cooling air film outlet channel. The cooling air film outlet channel is arranged toward the observation window close to one end of the injection component installation wall, and is used to spray a cooling air film from the upstream end of the observation window to control the temperature of the inner wall of the observation window. The propellant component includes a propellant air film outlet channel arranged on the inner side of the cooling air film outlet channel. The propellant air film outlet channel is used to spray a propellant air film to assist the flame combustion in the combustion chamber, and form a double-layer air film with the cooling air film to assist the cooling air film in controlling the temperature of the inner wall of the observation window.

[0006] Furthermore, the injection assembly installation wall is provided with an injection assembly installation slot, and the injection assembly installation slot is provided with an injection panel; The cooling air component further comprises a cooling air cavity arranged on the inner wall of the injection component mounting groove and a cooling air inlet arranged on the outer wall of the combustion chamber body and connected with the cooling air cavity, wherein the cooling air cavity is connected with the cooling air film outlet channel; The injection panel includes an embedding portion embedded in the injection assembly installation groove, and an outer wall end of the embedding portion is spaced apart from an upstream end surface of the observation window, and the space forms the cooling air film outlet channel.

[0007] Furthermore, the cooling air cavity includes a circular channel arranged in the injection panel and a flare connected to the side wall of the circular channel, one side of the flare abuts against the outer wall of the mosaic part, and the other side abuts against the upstream end face of the observation window, and the circular channel, the flare, the outer wall of the mosaic part and the upstream end face of the observation window enclose the cooling air cavity.

[0008] Furthermore, the propellant assembly also includes a propellant gas cavity arranged in the injection panel and a propellant gas inlet arranged on the outer wall of the injection panel and connected to the propellant gas cavity, and the propellant gas film outlet channel is connected to the propellant gas cavity.

[0009] Furthermore, a fuel nozzle is arranged in the middle of the injection panel, and the propulsion gas cavity is arranged around the outer wall of the fuel nozzle.

[0010] Furthermore, the cooling gas film outlet channel and the propellant film outlet channel are strip-shaped slit channels, and the length of the strip-shaped slit channels corresponds to the end surface of the observation window.

[0011] Furthermore, the cylindrical side wall is a rectangular cylinder, the three side walls of the rectangular cylinder are all provided with the observation windows, and the other side wall of the cylindrical side wall is provided with a temperature measuring hole.

[0012] Furthermore, the visual combustion chamber with body cooling also includes a water cooling structure arranged on the combustion chamber body; The water cooling structure comprises a water cooling liquid inlet and a water cooling liquid outlet arranged on the outer wall of the combustion chamber body, and also comprises a water cooling channel arranged inside the combustion chamber body and connecting the water cooling liquid inlet and the water cooling liquid outlet.

[0013] Furthermore, the visualized combustion chamber with body cooling also includes a nozzle assembly arranged on the nozzle assembly mounting wall.

[0014] The present invention also provides a rocket engine, comprising the above-mentioned visualized combustion chamber with body cooling.

[0015] The beneficial effect of the present invention is that the visual combustion chamber with body cooling provided by the present invention can significantly reduce the temperature of the observation window on the basis of improving the flame combustion effect in the combustion chamber through the structural design of the cooling gas film outlet channel and the propellant film outlet channel. On the one hand, it solves the problem that the current observation window is not resistant to high temperatures and is easily damaged by the high temperature in the combustion chamber, affecting the overall performance of the combustion chamber. On the other hand, it also solves the problem that the current cooling gas generally uses inert gas that does not participate in the combustion reaction, which causes the inert gas to enter the combustion chamber and affect the flame combustion. Specifically, the cooling air film ejected from the cooling air film outlet channel is used to directly dissipate heat to the inner wall of the observation window on the one hand, and can isolate the high-temperature flame in the combustion chamber from the observation window on the other hand, so as to ensure the temperature of the observation window and achieve effective thermal protection for the observation window, thereby improving the overall structural performance of the combustion chamber; the propellant air film ejected from the propellant air film outlet channel can, on the one hand, promote further combustion of the flame and improve combustion efficiency, and on the other hand, can form a double-layer air film with the cooling air film, that is, it is used to increase the flow distance of the cooling air film along the inner wall of the observation window, ensure the temperature control effect of the observation window at various locations in the direction from the injection assembly mounting wall to the nozzle assembly mounting wall, and can isolate the high-temperature flame in the combustion chamber from the cooling air film, and further isolate the high-temperature flame in the combustion chamber from the observation window. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the first angle structure of the combustion chamber body in the present invention; Attached Figure 2 For attachment Figure 1 Exploded cutaway view from medium perspective; Attached Figure 3 It is a second angle structural schematic diagram of the combustion chamber body in the present invention; Attached Figure 4 For attachment Figure 3 Exploded cutaway view from medium perspective; Attached Figure 5 A 3 / 4 cross-sectional view of a visualized combustion chamber with body cooling according to the present invention; Attached Figure 6 For attachment Figure 5 A partial enlarged view of point A in the middle.

[0017] In the figure, 1-combustion chamber body; 11-injection assembly mounting wall; 111-injection assembly mounting groove; 12-cylindrical side wall; 121-window mounting groove; 122-temperature measuring hole; 13-nozzle assembly mounting wall; 131-nozzle mounting groove; 14-combustion chamber; 15-window cover; 2-observation window; 3-cooling gas assembly; 31-cooling gas inlet; 32-cooling gas cavity; 321-circular channel; 322-expansion; 33-cooling gas film outlet channel; 4-injection panel; 41-fuel nozzle; 42-propellant assembly; 421-propellant gas inlet; 422-propellant gas cavity; 423-propellant film outlet channel; 43-fitting part; 44-limiting part; 5-nozzle assembly; 6-water cooling structure; 61-water cooling liquid inlet; 62-water cooling channel; 63-water cooling liquid outlet; 7-asbestos gasket; 8-sealing ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] As attached Figure 1 -Attached Figure 6 As shown, the present invention provides a visual combustion chamber with body cooling, comprising a combustion chamber body 1, an observation window 2 and a window temperature control structure; The combustion chamber body 1 comprises an injection assembly mounting wall 11, a cylindrical side wall 12 and a nozzle assembly mounting wall 13 which are arranged in sequence, wherein the injection assembly mounting wall 11, the cylindrical side wall 12 and the nozzle assembly mounting wall 13 enclose a combustion chamber 14, and the injection assembly mounting wall 11, the cylindrical side wall 12 and the nozzle assembly mounting wall 13 may be integrally formed and may be fixedly connected to each other using an assembled structure; The observation window 2 is arranged on the side wall of the cylindrical side wall 12, and is used to observe the flame combustion condition in the combustion chamber 14. Specifically, the camera can be used to continuously observe the flame combustion condition in the combustion chamber 14, which can be used to obtain data for combustion tests and monitor the combustion condition of the combustion chamber in actual use; The window temperature control structure includes a cooling gas component 3 and a propellant component 42, the cooling gas component 3 includes a cooling gas film outlet channel 33, the cooling gas film outlet channel 33 is arranged toward the end of the observation window 2 close to the injection component mounting wall 11, the end of the observation window 2 close to the injection component mounting wall 11 is the upstream end, and the end close to the nozzle assembly mounting wall 13 is the upstream end, the cooling gas film outlet channel 33 is used to spray a cooling gas film from the upstream end of the observation window 2 to control the temperature of the inner wall of the observation window 2. Specifically, the cooling gas film is used to directly dissipate heat to the inner wall of the observation window 2 on the one hand, and on the other hand, it can isolate the high-temperature flame in the combustion chamber 14 from the observation window 2, so as to ensure the temperature of the observation window 2, realize effective thermal protection of the observation window 2, and thereby improve the overall structural performance of the combustion chamber. The propellant component 42 includes a cooling gas film outlet channel 33 arranged at the cooling gas film outlet channel 33. The propellant film outlet channel 423 on the inner side of the outlet channel 33, i.e., the propellant film outlet channel 423, the cooling air film outlet channel 33 and the observation window 2 are arranged in sequence from the inside to the outside, and the propellant film outlet channel 423 is used to eject the propellant film to assist the flame combustion in the combustion chamber 14, and form a double-layer film with the cooling air film to assist the cooling air film in temperature control of the inner wall of the observation window 2, i.e., the propellant film can promote the further combustion of the flame and improve the combustion efficiency on the one hand, and can form a double-layer film with the cooling air film on the other hand, i.e., it is used to increase the flow distance of the cooling air film along the inner wall of the observation window 2, ensure the temperature control effect of the observation window 2 at various locations in the direction from the injection assembly mounting wall 11 to the nozzle assembly mounting wall 13, and can also isolate the high-temperature flame in the combustion chamber 14 from the cooling air film, and further isolate the high-temperature flame in the combustion chamber 14 from the observation window 2. In the process of the propellant film developing downstream, the propellant will diffuse to the middle of the combustion chamber 14 and promote the flame combustion.

[0024] That is, the visualized combustion chamber with body cooling provided by the present invention can significantly reduce the temperature of the observation window 2 on the basis of improving the flame combustion effect in the combustion chamber 14 through the structural design of the cooling gas film outlet channel 33 and the propellant gas film outlet channel 423. On the one hand, it solves the problem that the current observation window 2 is not resistant to high temperatures and is easily damaged by the high temperature in the combustion chamber 14, affecting the overall performance of the combustion chamber. On the other hand, it also solves the problem that the current cooling gas generally uses inert gas that does not participate in the combustion reaction, causing the inert gas to enter the combustion chamber 14 and affect the flame combustion. Specifically, the cooling air film ejected from the cooling air film outlet channel 33 can, on the one hand, be used to directly dissipate heat to the inner wall of the observation window 2, and on the other hand, can isolate the high-temperature flame in the combustion chamber 14 from the observation window 2, thereby ensuring the temperature of the observation window 2, achieving effective thermal protection for the observation window 2, and further improving the overall structural performance of the combustion chamber body 1; the propellant air film ejected from the propellant air film outlet channel 423 can, on the one hand, promote further combustion of the flame and improve combustion efficiency, and on the other hand, can form a double-layer air film with the cooling air film, that is, it is used to increase the flow distance of the cooling air film along the inner wall surface of the observation window 2, ensure the temperature control effect of the observation window 2 at various locations in the direction from the injection assembly mounting wall 11 to the nozzle assembly mounting wall 13, and can isolate the high-temperature flame in the combustion chamber 14 from the cooling air film, and further isolate the high-temperature flame in the combustion chamber 14 from the observation window 2.

[0025] In one embodiment, the injection assembly mounting wall 11 is provided with an injection assembly mounting groove 111, and the injection assembly mounting groove 111 is provided with an injection panel 4, and the injection panel 4 includes a limiting portion 44 and a fitting portion 43 connected to each other, wherein the limiting portion 44 abuts against the end surface of the injection assembly mounting wall 11, and the fitting portion 43 is fitted on the injection assembly mounting groove 111, and the injection panel 4 also includes a fuel nozzle 41 that passes through both ends of the fitting portion 43 and the limiting portion 44, and the fuel nozzle 41 communicates with the combustion chamber 14 and the outer wall of the injection panel 4, and the propellant assembly 42 is also arranged on the injection panel 4; The cooling gas component 3 also includes a cooling gas cavity 32 arranged on the inner wall of the injection component installation groove 111 and a cooling gas inlet 31 arranged on the outer wall of the combustion chamber body 1 and connected to the cooling gas cavity 32, and the cooling gas film outlet channel 33 is connected to the cooling gas cavity 32, wherein the cooling gas inlet 31 is used to connect the cooling gas input pipeline to supply air to the cooling gas cavity 32, and the cooling gas cavity 32 is used to accommodate cooling gas and to evenly transport cooling gas to the cooling gas film outlet channel 33; There is a gap between the outer wall end of the interlocking portion 43 and the upstream end face of the observation window 2, and the gap forms the cooling air film outlet channel 33. At this time, the cooling air film outlet channel 33 starts to spray directly from the end face of the observation window 2, so that the cooling air film can flow downstream close to the inner wall face of the observation window 2.

[0026] In this embodiment, the cooling gas film outlet channel 33 does not need to be processed separately, but is formed by the cooperation of the injection panel 4 and the injection component mounting groove 111. This can simplify the processing difficulty and is directly formed after the injection panel 4 is installed in the injection component mounting groove 111. In addition, the temperature control effect of the cooling gas film on the injection panel 4 can also be improved.

[0027] In one of the embodiments, the cooling air cavity 32 includes a circular channel 321 arranged in the injection panel 4 and a flare 322 connecting the side wall of the circular channel 321. One side of the flare 322 abuts against the outer wall of the fitting portion 43, and the other side abuts against the upstream end face of the observation window 2. The circular channel 321, the flare 322, the outer wall of the fitting portion 43 and the upstream end face of the observation window 2 form the cooling air cavity 32. In this embodiment, there is no need to set a closed cooling air channel in the injection panel 4. An open structure is used for easy processing. The cooling air cavity 32 is directly formed after the observation window 2 and the injection panel 4 are installed. In addition, in this embodiment, the cooling air can also cool the upstream end face of the observation window 2 when it contacts it, thereby further ensuring the temperature control effect on the observation window 2.

[0028] In one embodiment, the propellant assembly 42 also includes a propellant gas cavity 422 disposed in the injection panel 4 and a propellant gas inlet 421 disposed on the outer wall of the injection panel 4 and connected to the propellant gas cavity 422. The propellant gas film outlet channel 423 is connected to the propellant gas cavity 422. The propellant gas inlet 421 is used to connect to a propellant gas input pipeline. After passing through the propellant gas cavity 422, the propellant gas is evenly sprayed out from the propellant gas film outlet channel 423 to form a uniform gas film.

[0029] In one of the embodiments, a fuel nozzle 41 is provided in the middle of the injection panel 4, and the propellant gas cavity 422 is arranged around the outer wall of the fuel nozzle 41, so that when there are multiple observation windows 2, multiple propellant gas film outlet channels 423 can be supplied with gas through one propellant gas cavity 422.

[0030] In one embodiment, the cooling gas film outlet channel 33 and the propellant film outlet channel 423 are strip slit channels, and the length of the strip slit channels corresponds to the end surface of the observation window 2, that is, the cooling gas film and the propellant film are both planar films with the same width as the observation window 2, further ensuring the temperature control effect on the observation window 2.

[0031] In one embodiment, the cylindrical side wall 12 is a rectangular cylinder, and the observation windows 2 are arranged on the three side walls of the rectangular cylinder, and a temperature measuring hole 122 is arranged on the side wall of another cylindrical side wall 12. In this embodiment, the three observation windows 2 realize the observation of the flame combustion condition in the combustion chamber 14 from multiple directions, and the other side wall without the observation window 2 is provided with the temperature measuring hole 122 for installing the temperature sensor, which can avoid the double-layer air film from affecting the temperature measuring accuracy of the temperature measuring sensor and ensure the accuracy of the temperature measurement. Preferably, a plurality of temperature measuring holes 122 are arranged at equal intervals from the injection assembly mounting wall 11 to the nozzle assembly mounting wall 13, so as to monitor the temperature of different positions of the flame.

[0032] In one of the embodiments, the visual combustion chamber with body cooling further includes a water cooling structure 6 disposed on the combustion chamber body 1; The water-cooling structure 6 includes a water-cooling liquid inlet 61 and a water-cooling liquid outlet 63 arranged on the outer wall of the combustion chamber body 1, and also includes a water-cooling channel 62 arranged inside the combustion chamber body 1 and connecting the water-cooling liquid inlet 61 and the water-cooling liquid outlet 63. The water-cooling liquid inlet 61 and the water-cooling liquid outlet 63 are respectively connected to the coolant input pipe and the coolant output pipe, and the water-cooling channel 62 is used to dissipate heat to the injection assembly mounting wall 11, the cylindrical side wall 12 and the nozzle assembly mounting wall 13 to ensure the overall structural stability of the combustion chamber body 1. Preferably, the water-cooling channel 52 is arranged on the injection assembly mounting wall 11, the cylindrical side wall 12 and the nozzle assembly mounting wall 13, and multiple water-cooling liquid outlets 63 can also be provided.

[0033] In one of the embodiments, the visualized combustion chamber with body cooling also includes a nozzle assembly 5 arranged on the nozzle assembly mounting wall 13, and the nozzle assembly 5 is used to spray flames. Preferably, a nozzle mounting groove 131 is provided on the nozzle assembly mounting wall 13, and the nozzle assembly 5 is arranged on the nozzle mounting groove 131.

[0034] In one of the embodiments, a window mounting groove 121 for mounting the observation window 2 is provided on the cylindrical side wall 12, and a window cover 15 is detachably provided on the outer wall of the cylindrical side wall 12. Preferably, the window mounting groove 121 is a stepped groove, and the observation window 2 is a stepped type corresponding to the stepped groove, and the window cover 15 is used to lock the observation window 2 in the window mounting groove 121. Preferably, asbestos gaskets 7 are provided between the step of the window mounting groove 121 and the observation window 2, and between the window cover 15 and the observation window 2, and a sealing ring 8 is also provided between the window cover 15 and the observation window 2, thereby achieving sealing between the window mounting groove 121 and the observation window 2.

[0035] The present invention also provides a rocket engine, comprising the above-mentioned visualized combustion chamber with body cooling.

[0036] The above is only an embodiment and does not limit the present invention in any way. Any person skilled in the art can use the above disclosed technical contents to make many possible changes, modifications or modifications to the technical solutions of the present invention into equivalent embodiments of equivalent changes without departing from the scope of the technical solutions of the present invention. Therefore, any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A visual combustion chamber with body cooling, characterized in that: It comprises a combustion chamber body (1), an observation window (2) and a window temperature control structure; The combustion chamber body (1) comprises an injection assembly mounting wall (11), a cylindrical side wall (12) and a nozzle assembly mounting wall (13) which are arranged in sequence, and the injection assembly mounting wall (11), the cylindrical side wall (12) and the nozzle assembly mounting wall (13) enclose a combustion chamber (14); The observation window (2) is arranged on the side wall of the cylindrical side wall (12) and is used to observe the combustion conditions of the flame in the combustion chamber (14); The window temperature control structure comprises a cooling air component (3) and a propellant component (42), wherein the cooling air component (3) comprises a cooling air film outlet channel (33), wherein the cooling air film outlet channel (33) is arranged toward the end of the observation window (2) close to the injection component mounting wall (11), and is used to spray a cooling air film from the upstream end of the observation window (2) to control the temperature of the inner wall of the observation window (2), and the propellant component (42) comprises a propellant air film outlet channel (423) arranged on the inner side of the cooling air film outlet channel (33), wherein the propellant air film outlet channel (423) is used to spray a propellant air film to assist the flame combustion in the combustion chamber (14), and to form a double-layer air film with the cooling air film to assist the cooling air film in controlling the temperature of the inner wall of the observation window (2).

2. The visualized combustion chamber with body cooling as claimed in claim 1, characterized in that: The injection assembly installation wall (11) is provided with an injection assembly installation groove (111), and the injection assembly installation groove (111) is provided with an injection panel (4); The cooling air component (3) further comprises a cooling air cavity (32) arranged on the inner wall of the injection component mounting groove (111) and a cooling air inlet (31) arranged on the outer wall of the combustion chamber body (1) and connected to the cooling air cavity (32); the cooling air cavity (32) is connected to the cooling air film outlet channel (33); The injection panel (4) comprises an engaging portion (43) engaged in the injection assembly mounting groove (111), and an outer wall end of the engaging portion (43) is spaced from an upstream end surface of the observation window (2), the space forming the cooling air film outlet channel (33).

3. The visualized combustion chamber with body cooling as claimed in claim 2, characterized in that: The cooling air cavity (32) comprises a circular channel (321) arranged in the injection panel (4) and a flared opening (322) communicating with the side wall of the circular channel (321); one side of the flared opening (322) abuts against the outer wall of the fitting portion (43), and the other side abuts against the upstream end face of the observation window (2); the circular channel (321), the flared opening (322), the outer wall of the fitting portion (43) and the upstream end face of the observation window (2) enclose the cooling air cavity (32).

4. The visualized combustion chamber with body cooling as claimed in claim 2, characterized in that: The propellant assembly (42) further comprises a propellant gas cavity (422) arranged in the injection panel (4) and a propellant gas inlet (421) arranged on the outer wall of the injection panel (4) and connected to the propellant gas cavity (422); the propellant gas film outlet channel (423) is connected to the propellant gas cavity (422).

5. The visualized combustion chamber with body cooling as claimed in claim 4, characterized in that: A fuel nozzle (41) is arranged in the middle of the injection panel (4), and the propulsion gas cavity (422) is arranged around the outer wall of the fuel nozzle (41).

6. The visualized combustion chamber with body cooling according to any one of claims 1 to 5, characterized in that: The cooling gas film outlet channel (33) and the propellant gas film outlet channel (423) are strip-shaped slit channels, and the length of the strip-shaped slit channels corresponds to the end surface of the observation window (2).

7. The visualized combustion chamber with body cooling according to any one of claims 1 to 5, characterized in that: The cylindrical side wall (12) is a rectangular cylinder, and the observation windows (2) are arranged on three side walls of the rectangular cylinder, and a temperature measuring hole (122) is arranged on the side wall of another cylindrical side wall (12).

8. The visualized combustion chamber with body cooling according to any one of claims 1 to 5, characterized in that: It also includes a water cooling structure (6) arranged on the combustion chamber body (1); The water cooling structure (6) comprises a water cooling liquid inlet (61) and a water cooling liquid outlet (63) arranged on the outer wall of the combustion chamber body (1), and also comprises a water cooling channel (62) arranged inside the combustion chamber body (1) and connecting the water cooling liquid inlet (61) and the water cooling liquid outlet (63).

9. The visualized combustion chamber with body cooling according to any one of claims 1 to 5, characterized in that: It also includes a nozzle assembly (5) arranged on the nozzle assembly mounting wall (13).

10. A rocket engine, characterized in that: It comprises a visualized combustion chamber with body cooling as described in any one of claims 1 to 9.

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