Injector based on liquid oxygen methane two-component propellant and attitude control engine

Abstract

The utility model provides an injector and an attitude control engine based on a liquid oxygen methane two-component propellant, and the injector comprises an injector body, a centrifugal nozzle assembly and a spark plug, the centrifugal nozzle assembly is arranged on the injector body, and the injector body is provided with a liquid collecting cavity; a propellant in the storage box is guided to the liquid collecting cavity and is sprayed to the spraying pipe through the centrifugal nozzle assembly; and the spark plug is arranged on the injector body so as to ignite the propellant sprayed into the spray pipe by the centrifugal nozzle assembly. The injector is more compact in structure, and the working reliability of the injector can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of liquid rocket, concretely relates to a kind of based on liquid oxygen methane two-component propellant's injector and attitude control engine. BACKGROUND

[0002] The existing attitude control engine is mostly combined with natural propellant such as dinitrogen tetroxide / hydrazine, which is toxic and inconvenient to use and maintain. Therefore, high performance, green and non-toxic are the mainstream development direction of liquid propellant. At present, such propellant combinations include low-temperature propellants such as liquid oxygen methane and liquid hydrogen. Due to their excellent performance in various aspects, liquid oxygen methane combination has become the first choice for attitude control engine.

[0003] It is particularly important to design an injector and attitude control engine based on liquid oxygen methane two-component propellant for using liquid oxygen methane propellant as fuel for attitude control engine. SUMMARY

[0004] The utility model aims at overcoming the shortcomings of the prior art and providing an injector and attitude control engine based on liquid oxygen methane two-component propellant.

[0005] The utility model provides an injector and attitude control engine based on liquid oxygen methane two-component propellant, comprising: an injector body, a centrifugal nozzle assembly and a spark plug; the centrifugal nozzle assembly is arranged on the injector body, and the injector body is provided with a liquid collecting chamber; the propellant in the storage tank is guided to the liquid collecting chamber and flows through the centrifugal nozzle assembly to be injected into the nozzle; the spark plug is arranged on the injector body to ignite the propellant injected into the nozzle by the centrifugal nozzle assembly.

[0006] According to one embodiment of the utility model, the propellant in the storage tank is guided to the liquid collecting chamber through the pipe nozzle; the liquid collecting chamber comprises an oxygen liquid collecting chamber and a methane liquid collecting chamber; the centrifugal nozzle assembly comprises an oxygen centrifugal nozzle and a methane centrifugal nozzle; the oxygen liquid collecting chamber and the methane liquid collecting chamber are respectively connected with one pipe nozzle to guide liquid oxygen and liquid methane to the oxygen centrifugal nozzle and the methane centrifugal nozzle respectively.

[0007] According to one embodiment of the utility model, at least part of the oxygen liquid collecting chamber is arranged around at least part of the methane liquid collecting chamber, so that the liquid oxygen in the oxygen liquid collecting chamber cools the liquid methane in the liquid methane collecting chamber.

[0008] According to one embodiment of the utility model, the methane centrifugal nozzle is sleeved on the circumferential outer side of the oxygen centrifugal nozzle, and is arranged with a gap between each other, liquid oxygen flows through the inner cavity of the oxygen centrifugal nozzle from the oxygen liquid collecting cavity and enters the nozzle, and liquid methane flows through the cavity formed by the circumferential inner side of the methane centrifugal nozzle and the circumferential outer side of the oxygen centrifugal nozzle from the methane liquid collecting cavity and enters the nozzle.

[0009] According to one embodiment of the utility model, a plurality of oxygen nozzle tangential holes are arranged on the circumferential side of the oxygen centrifugal nozzle along the circumferential direction thereof, and the oxygen nozzle tangential holes are used for connecting the oxygen liquid collecting cavity and the inner cavity of the oxygen centrifugal nozzle, and a plurality of methane nozzle tangential holes are arranged on the circumferential side of the methane centrifugal nozzle along the circumferential direction thereof, and the methane nozzle tangential holes are used for connecting the methane liquid collecting cavity and the cavity of the methane centrifugal nozzle.

[0010] According to one embodiment of the utility model, the axial direction of the plurality of oxygen nozzle tangential holes is arranged at an angle with the radial direction of the oxygen centrifugal nozzle, the axial direction of the plurality of methane nozzle tangential holes is arranged at an angle with the radial direction of the methane centrifugal nozzle, and the rotation directions of the plurality of oxygen nozzle tangential holes and the plurality of methane nozzle tangential holes are opposite.

[0011] According to one embodiment of the utility model, the outlet of the oxygen centrifugal nozzle is arranged staggeredly with the outlet of the methane centrifugal nozzle, and the outlet of the methane centrifugal nozzle is close to the nozzle, and the mist cone formed by the liquid oxygen sprayed out of the oxygen centrifugal nozzle is tangent to the lip of the outlet of the methane centrifugal nozzle.

[0012] According to one embodiment of the utility model, the end face downstream of the injector body is provided with a panel, the panel is provided with a plurality of liquid methane cooling tangential holes, and the plurality of liquid methane cooling tangential holes are used for guiding the liquid methane in the liquid methane liquid collecting cavity to the vicinity of the nozzle side wall to cool the nozzle side wall.

[0013] According to one embodiment of the utility model, the end face of the panel opposite to the injector body is provided with a plurality of acoustic cavity holes.

[0014] On the other hand, the utility model provides a kind of attitude control engine based on liquid oxygen methane dual component propellant, comprising: the injector and nozzle as described above, and the injector is arranged in the head of the nozzle.

[0015] According to the injector based on liquid oxygen methane dual component propellant of the utility model, structure is more compact, simple to operate, and the reliability of injector work can be improved.

[0016] It should be appreciated that the above general description and the following specific embodiments are only exemplary and explanatory, and cannot limit the scope of the utility model claimed. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are part of this specification, illustrate examples of the present application and together with the description help explain the principles of the present application.

[0018] Figure 1 is a sectional view of a liquid oxygen-methane bipropellant-based attitude control engine of one embodiment of the present application;

[0019] Figure 2 is a perspective view of a flow channel of a liquid collector cavity of a injector of one embodiment of the present application;

[0020] Figure 3 is a sectional view of a centrifugal nozzle assembly of one embodiment of the present application;

[0021] Figure 4 is a sectional view of a centrifugal nozzle assembly of one embodiment of the present application; Figure 3 is a sectional view in A-A direction;

[0022] Figure 5 is a sectional view in C-C direction; Figure 3 is a sectional view in C-C direction;

[0023] Figure 6 is a sectional view of a injector of one embodiment of the present application;

[0024] Figure 7 is a sectional view of a injector of one embodiment of the present application; Figure 6 is a sectional view in B-B direction.

[0025] Explanation of reference signs:

[0026] 1-injector body; 2-nozzle; 3-centrifugal nozzle assembly; 4-spark plug; 5-adapter nozzle; 6-adjusting gasket; 7-faceplate; 11-oxygen liquid collector cavity; 12-methane liquid collector cavity; 13-acoustic cavity hole; 31-oxygen centrifugal nozzle; 32-methane centrifugal nozzle; 311-oxygen nozzle tangential hole; 321-methane nozzle tangential hole; 121-liquid methane cooling tangential hole. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of each aspect of the present application will be described below in detail, in order to make the purpose, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application, for exemplary description of the principles of the present application, and are not configured to limit the present application. In addition, the structural members in the drawings are not necessarily drawn to scale. For example, the size of some structural members in the drawings can be enlarged for other structural members or regions to help understand the embodiments of the present application.

[0028] The orientation words appearing in the following description are the directions shown in the drawings, and are not to limit the specific structure of the embodiments of the utility model. In the description of the utility model, it is to be explained that, unless otherwise specified, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In addition, the terms "including", "containing", "having" or any other variants thereof are intended to cover non-exclusive inclusion, so that the inclusion of a series of component structures or components not only includes those components, but also includes other components not explicitly listed or inherent in the structure, component. Without more limitation, the elements defined by the statement "including" do not exclude the presence of additional identical elements in the article or device including the elements.

[0030] Spatial relationship terms such as "below", "under", "under", "low", "above", "on", "high" and the like are used to facilitate the description to explain the positioning of one element relative to the second element, indicating that these terms are intended to cover different orientations of the device in addition to the orientations shown in the drawings. In addition, for example, "one element is on / under another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and are not specifically intended to refer to order or sequence, and should not be considered as limiting. Similar terms are used throughout the description to represent similar elements.

[0031] In the following description of the utility model, "rocket", "carrier rocket", "spacecraft", "spacecraft carrier" or "missile" may be used in some description scenarios, which is only for the convenience of description, and the connotation is not limited to the specific word used. Generally, the rocket or carrier rocket of the utility model includes space launch vehicles for launching satellites or spacecraft or other probes, as well as various missiles, rockets and other weapons for carrying military payloads, and similar products that can send payloads into the air. When interpreting the above specific words, those skilled in the art should not limit the rocket to only one of the carrier rocket or the missile according to the specific word used in the description scenario, thereby narrowing the protection scope of the utility model.

[0032] For those skilled in the art, the utility model can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the utility model by showing examples of the utility model.

[0033] Figure 1 is a sectional view of a liquid oxygen-methane bipropellant-based attitude control engine of an embodiment of the utility model; Figure 2 is a perspective view of a flow channel of a liquid collector of an injector of an embodiment of the utility model; Figure 3 is a sectional view of a centrifugal nozzle assembly of an embodiment of the utility model; Figure 4 is Figure 3 a sectional view in the A-A direction; Figure 5 is Figure 3 a sectional view in the C-C direction; Figure 6 is a sectional view of an injector of an embodiment of the utility model; Figure 7 is Figure 6 a sectional view in the B-B direction.

[0034] As shown in Figure 1 , the utility model provides a kind of based on liquid oxygen-methane bipropellant's injector, comprising: injector body 1, centrifugal nozzle assembly 3 and spark plug 4.Centrifugal nozzle assembly 3 is set to injector body 1, and injector body 1 is provided with liquid collector.Propellant in storage tank is guided to liquid collector, and is injected to nozzle 2 by flowing through centrifugal nozzle assembly 3.Spark plug 4 is set to injector body 1, to ignite the propellant that centrifugal nozzle assembly 3 is injected to nozzle 2.

[0035] Specifically, compared with traditional hydrazine-based self-ignition type bipropellant attitude control engine, liquid oxygen-methane propellant is combined as non-self-ignition propellant, and additional ignition element is needed to realize reliable ignition.In addition, due to the small working flow of attitude control engine, low boiling point of propellant, pulse working thermal back invasion, pipeline heat leakage and other factors, the phase state of propellant is affected, which further affects the ignition reliability and steady / pulse operation.Under normal circumstances, by ensuring propellant inlet condition and inhibiting propellant head phase change, the key and difficulty of injector design is to ensure propellant inlet condition and inhibit propellant head phase change.

[0036] The injector provided by the embodiment is arranged close to the outlet of the centrifugal nozzle assembly 3 by the ignition component of the spark plug 4, so that the torch ignition structure is avoided to be additionally increased, the structure is more compact, the operation is simple, and the reliability of the injector is improved. For example, the centrifugal nozzle assembly 3 can be installed on the injector body 1 (for example, at the middle position of the injector body 1) by brazing. The spark plug 4 can be connected with the injector body 1 by screwing, and the spark plug 4 can be arranged at the position close to the side edge of the injector body 1. Alternatively, the spark plug 4 is arranged at the middle position of the injector body 1, and the centrifugal nozzle assembly 3 is arranged at the position close to the side edge of the injector body 1. The nozzle 2 can be installed downstream of the injector body 1 by screwing. For example, the ignition component of the spark plug 4 is arranged close to the outlet of the centrifugal nozzle assembly 3, so as to ignite the propellant in the nozzle 2 by the centrifugal nozzle assembly 3, and the propellant is combusted in the nozzle 2.

[0037] As shown in Figure 2 and 3 According to one embodiment of the utility model, the propellant in the storage tank is guided to the liquid collecting cavity through the connecting nozzle 5. The liquid collecting cavity includes an oxygen liquid collecting cavity 11 and a methane liquid collecting cavity 12. The centrifugal nozzle assembly 3 includes an oxygen centrifugal nozzle 31 and a methane centrifugal nozzle 32. The oxygen liquid collecting cavity 11 and the methane liquid collecting cavity 12 are respectively connected with one connecting nozzle 5 to guide the liquid oxygen and the liquid methane to the oxygen centrifugal nozzle 31 and the methane centrifugal nozzle 32 respectively.

[0038] In the embodiment, the liquid oxygen and the liquid methane enter the oxygen liquid collecting cavity 11 and the methane liquid collecting cavity 12 through the connecting nozzle 5 respectively, and are then sprayed into the nozzle 2 by the oxygen centrifugal nozzle 31 and the methane centrifugal nozzle 32, and are ignited by the spark plug, so that the propellant is combusted in the nozzle 2. For example, the connecting nozzle 5 can be installed on the upper part of the injector body 1 by welding. The injector adopts the design scheme of direct ignition by the spark plug 4 and the double-path centrifugal nozzle, the structure is more compact, the operation is simple, and the reliability of the engine is improved.

[0039] As shown in Figure 2 According to one embodiment of the utility model, at least part of the oxygen liquid collecting cavity 11 is arranged around at least part of the methane liquid collecting cavity 12, so that the liquid oxygen in the oxygen liquid collecting cavity 11 cools the liquid methane in the methane liquid collecting cavity 12.

[0040] In the embodiment, when the engine starts, the valves of the connecting nozzles 5 are opened respectively, the liquid oxygen enters the oxygen liquid collecting cavity 11 through one connecting nozzle 5, and the liquid methane enters the methane liquid collecting cavity 12 through another connecting nozzle 5. The liquid oxygen cools the methane liquid collecting cavity 12 during the flowing process in the oxygen liquid collecting cavity 11, so that the liquid methane is prevented from being vaporized by heat, the propellant is promoted to quickly reach the liquid phase region when the engine starts, the flow supply of the propellant is stabilized, and the reliability of the ignition work is improved.

[0041] According to one embodiment of the present application, at least part of the oxygen liquid collecting cavity 11 and at least part of the methane liquid collecting cavity 12 can be arranged in layers. For example, at least part of the oxygen liquid collecting cavity 11 is arranged at the upper part of at least part of the methane liquid collecting cavity 12.

[0042] According to one embodiment of the present application, the outer side of the oxygen liquid collecting cavity 11 and the methane liquid collecting cavity 12 can be provided with a vacuum insulation interlayer, so as to reduce the heat exchange between the propellant and the outside, and improve the cooling efficiency of the liquid oxygen on the liquid methane, and can well inhibit the phase change of the small flow propellant.

[0043] As shown in Figure 2 and 3 According to one embodiment of the present application, the methane centrifugal nozzle 32 is arranged on the circumferential outer side of the oxygen centrifugal nozzle 31, and is arranged with a gap therebetween. The liquid oxygen flows from the oxygen liquid collecting cavity 11 into the inner cavity of the oxygen centrifugal nozzle 31 and enters the nozzle 2. The liquid methane flows from the methane liquid collecting cavity 12 through the cavity formed by the circumferential inner side of the methane centrifugal nozzle 32 and the circumferential outer side of the oxygen centrifugal nozzle 31 and enters the nozzle 2.

[0044] In the present embodiment, for example, the methane centrifugal nozzle 32 and the oxygen centrifugal nozzle 31 can be connected by welding.

[0045] As shown in Figure 4 and 5 According to one embodiment of the present application, the circumferential side of the oxygen centrifugal nozzle 31 is provided with a plurality of oxygen nozzle tangential holes 311 along the circumferential direction thereof, and the oxygen nozzle tangential holes 311 are used for connecting the oxygen liquid collecting cavity 11 and the inner cavity of the oxygen centrifugal nozzle 31. The circumferential side of the methane centrifugal nozzle 32 is provided with a plurality of methane nozzle tangential holes 321 along the circumferential direction thereof, and the methane nozzle tangential holes 321 are used for connecting the methane liquid collecting cavity 12 and the cavity of the methane centrifugal nozzle 32.

[0046] As shown in Figure 4 and 5 According to one embodiment of the present application, the axial direction of the plurality of oxygen nozzle tangential holes 311 is arranged at an angle with the radial direction of the oxygen centrifugal nozzle 31. The axial direction of the plurality of methane nozzle tangential holes 321 is arranged at an angle with the radial direction of the methane centrifugal nozzle 32. The rotation directions of the plurality of oxygen nozzle tangential holes 311 and the plurality of methane nozzle tangential holes 321 are opposite.

[0047] In the present embodiment, the liquid oxygen is injected into the inner cavity of the oxygen centrifugal nozzle 31 through the oxygen nozzle tangential holes 311, and forms a rotational flow in the inner cavity and is atomized. The liquid methane is injected into the inner cavity of the methane centrifugal nozzle 32 through the methane nozzle tangential holes 321, and forms a rotational flow in the inner cavity and is atomized. The injector adopts a double-path anti-rotation type centrifugal nozzle, wherein the rotation directions of the oxygen nozzle tangential holes 311 and the methane nozzle tangential holes 321 are opposite, which can promote the mixing, breaking and atomization of the liquid oxygen and the liquid methane, and make the mixing of the liquid oxygen and the liquid methane more sufficient.

[0048] According to one embodiment of the present application, the outlet of the oxygen centrifugal nozzle 31 is staggered with the outlet of the methane centrifugal nozzle 32, and the outlet of the methane centrifugal nozzle 32 is close to the nozzle 2. The mist cone formed by the liquid oxygen sprayed from the oxygen centrifugal nozzle 31 is tangent to the lip of the outlet of the methane centrifugal nozzle 32.

[0049] In this embodiment, the mist cone formed by the liquid oxygen sprayed from the oxygen centrifugal nozzle 31 collides with the cone angle of the mist cone formed by the liquid methane sprayed from the methane centrifugal nozzle 32, triggering the liquid film suction effect, so that the liquid oxygen and the liquid methane are mixed to form a liquid film mist cone. At the outlet of the methane centrifugal nozzle 32, the liquid film mist cone is ignited by the pulsed discharge of the spark plug 4, and the combustion gas is sprayed out of the nozzle 2.

[0050] As shown in Figure 1 and 6 , according to one embodiment of the present application, an adjusting gasket 6 is arranged at the contact position of the handle of the spark plug 4 and the injector body 1 in the circumferential direction thereof. By replacing adjusting gaskets 6 of different thicknesses, the depth of the spark plug 4 inserted into or rotated out of the injector body 1 can be adjusted.

[0051] In this embodiment, by tightening the spark plug 4, the handle of the spark plug 4 can press the adjusting gasket 6 against the injector body 1. By adjusting the depth of the spark plug 4 inserted into the injector body 1, the position of the ignition component of the spark plug 4 can be adjusted. For example, the injector can adjust the distance between the electrode head of the spark plug 4 and the downstream end surface of the injector body 1. By controlling the ignition position, the injector can improve the reliability of the engine ignition operation.

[0052] As shown in Figure 2 , 6 and 7, according to one embodiment of the present application, a face plate 7 is arranged at the downstream end surface of the injector body 1. The face plate 7 is provided with a plurality of liquid methane cooling tangential holes 121 for guiding the liquid methane in the liquid methane collecting chamber 12 to the vicinity of the side wall of the nozzle 2 to cool the side wall of the nozzle 2.

[0053] In this embodiment, the injector body 1, the face plate 7 and the centrifugal nozzle assembly 3 jointly constitute the oxygen collecting chamber 11 and the methane collecting chamber 12 which are isolated from each other. For example, the axial direction of the liquid methane cooling tangential hole 121 is arranged at an angle with the circumferential direction of the face plate 7 or the injector body 1. Part of the methane is spirally sprayed out of the liquid methane cooling tangential hole 121 to the nozzle 2 to cool the inner wall of the high-temperature nozzle 2. For example, the face plate 7 can be installed on the injector body 1 by laser welding. The methane path of the injector adopts an integrated central double-path reverse-rotation centrifugal nozzle and an edge region spiral cooling structure design, which improves the reliability of small-flow methane edge region cooling.

[0054] As shown in Figure 7As shown, according to one embodiment of the present invention, a plurality of acoustic cavity holes 13 are provided on the end face of the panel 7 opposite to the injector body 1.

[0055] In this embodiment, for example, multiple acoustic cavity holes 13 with different apertures can be provided on the end face of the panel 7 to suppress unstable combustion in the combustion chamber.

[0056] On the other hand, this utility model provides an attitude control engine based on liquid oxygen and methane bicomponent propellant, including the above-mentioned injector and nozzle 2, with the injector disposed at the head of the nozzle 2.

[0057] In this embodiment, the injector body 1 and the nozzle 2 of the injector constitute a combustion chamber for burning propellant, and the combustion products are ejected from the nozzle 2 to generate thrust.

[0058] For example, during the operation of the attitude control engine, the control valves of the connecting nozzles 5 connecting the two propellant streams are opened respectively. Liquid oxygen enters the oxygen collection chamber 11 through the connecting nozzle 5 and is atomized by being sprayed out through the oxygen nozzle tangential hole 311 of the oxygen centrifugal nozzle 31. At the same time, liquid methane enters the methane collection chamber 12 (cooled by liquid oxygen) through another connecting nozzle 5 and is atomized by being sprayed out through the methane nozzle tangential hole 321 of the methane centrifugal nozzle 32. After the liquid methane and liquid oxygen are mixed, atomized, and evaporated at the lip of the methane centrifugal nozzle 32, they are ignited by the spark plug 4 on the side to form a stable flame. In addition, some liquid methane flows through the methane collection chamber 12 (for example, through the lower part of the methane collection chamber) and is swirled out from the liquid methane cooling tangential hole 121 in the side area to the side wall of the nozzle 2 to cool the side wall of the nozzle 2.

[0059] Those skilled in the art will understand that this invention uses liquid oxygen and liquid methane as examples to illustrate the structure and working principle of the injector and attitude control engine, and is not intended to limit the scope of protection of this invention. For example, the injector and attitude control engine provided by this invention are also applicable to cryogenic bicomponent non-self-igniting propellant combinations such as liquid oxygen / liquid hydrogen and liquid oxygen / kerosene.

[0060] The above embodiments of this utility model can be combined with each other and have corresponding technical effects.

[0061] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A liquid oxygen-methane bipropellant based injector characterized by, The injector comprises: an injector body, a centrifugal nozzle assembly and a spark plug; the centrifugal nozzle assembly is arranged in the injector body, and the injector body is arranged with a liquid collection chamber; propellant in the tank is guided to the liquid collection chamber and sprayed into the nozzle through the centrifugal nozzle assembly; the spark plug is arranged in the injector body to ignite the propellant sprayed into the nozzle by the centrifugal nozzle assembly.

2. The injector of claim 1, wherein The propellant in the tank is guided to the liquid collection chamber through the connecting pipe; the liquid collection chamber comprises an oxygen liquid collection chamber and a methane liquid collection chamber; the centrifugal nozzle assembly comprises an oxygen centrifugal nozzle and a methane centrifugal nozzle; The oxygen liquid collection chamber and the methane liquid collection chamber are respectively connected with one connecting pipe to guide liquid oxygen and liquid methane to the oxygen centrifugal nozzle and the methane centrifugal nozzle respectively.

3. The injector of claim 2, wherein At least part of the oxygen liquid collection chamber is arranged around at least part of the methane liquid collection chamber, so that the liquid oxygen in the oxygen liquid collection chamber cools the liquid methane in the liquid methane collection chamber.

4. The injector of claim 2, wherein The methane centrifugal nozzle is arranged on the circumferential outer side of the oxygen centrifugal nozzle with a gap therebetween; liquid oxygen flows from the oxygen liquid collection chamber into the nozzle through the inner cavity of the oxygen centrifugal nozzle; Liquid methane flows from the methane liquid collection chamber into the nozzle through the cavity formed between the circumferential inner side of the methane centrifugal nozzle and the circumferential outer side of the oxygen centrifugal nozzle.

5. The injector of claim 4, wherein, The circumferential side of the oxygen centrifugal nozzle is provided with a plurality of oxygen nozzle tangential holes along the circumferential direction thereof, which are used to communicate the oxygen liquid collection chamber and the inner cavity of the oxygen centrifugal nozzle; the circumferential side of the methane centrifugal nozzle is provided with a plurality of methane nozzle tangential holes along the circumferential direction thereof, which are used to communicate the methane liquid collection chamber and the cavity of the methane centrifugal nozzle.

6. The injector of claim 5 wherein, The axial direction of the plurality of oxygen nozzle tangential holes is arranged at an angle with the radial direction of the oxygen centrifugal nozzle; the axial direction of the plurality of methane nozzle tangential holes is arranged at an angle with the radial direction of the methane centrifugal nozzle; the rotation directions of the plurality of oxygen nozzle tangential holes and the plurality of methane nozzle tangential holes are opposite.

7. The injector of claim 4 wherein, The outlet of the oxygen centrifugal nozzle is arranged staggered with the outlet of the methane centrifugal nozzle, and the outlet of the methane centrifugal nozzle is close to the nozzle; the spray cone formed by the liquid oxygen sprayed out of the oxygen centrifugal nozzle is tangent to the lip of the outlet of the methane centrifugal nozzle.

8. The injector of claim 2, wherein The end face downstream of the injector body is provided with a panel; the panel is provided with a plurality of liquid methane cooling tangential holes, which are used to guide the liquid methane in the liquid methane collection chamber to the vicinity of the nozzle sidewall to cool the nozzle sidewall.

9. The injector of claim 8, wherein, The end face of the panel opposite to the injector body is provided with a plurality of acoustic cavity holes.

10. A liquid oxygen-methane bipropellant based attitude control engine characterized in that, The injector comprises: an injector body, a centrifugal nozzle assembly and a spark plug; the centrifugal nozzle assembly is arranged in the injector body, and the injector body is arranged with a liquid collection chamber; propellant in the tank is guided to the liquid collection chamber and sprayed into the nozzle through the centrifugal nozzle assembly; the spark plug is arranged in the injector body to ignite the propellant sprayed into the nozzle by the centrifugal nozzle assembly. The injector comprises: an injector body, a centrifugal nozzle assembly and a spark plug; the centrifugal nozzle assembly is arranged in the injector body, and the injector body is arranged with a liquid collection chamber; propellant in the tank is guided to the liquid collection chamber and sprayed into the nozzle through the centrifugal nozzle assembly; the spark plug is arranged in the injector body to ignite the propellant sprayed into the nozzle by the centrifugal nozzle assembly.

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