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

Abstract

The invention provides an injector based on a liquid oxygen methane two-component propellant and an attitude control engine, 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; the sparking plug is arranged on the injector body, and an ignition part of the sparking plug is arranged close to an outlet of the centrifugal nozzle assembly 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 present invention relates to the field of liquid rockets, and in particular to an injector and an attitude control engine based on liquid oxygen-methane bipropellant. Background Art

[0002] Existing attitude control engines mostly use natural propellant combinations such as nitrogen tetroxide / hydrazine. These media are highly toxic and inconvenient to use and maintain. Therefore, high performance, green, and non-toxic are the mainstream development direction of liquid propellants. At present, this type of propellant combination includes cryogenic propellants such as liquid oxygen and methane, liquid oxygen and liquid hydrogen. In view of its excellent performance in all aspects, the liquid oxygen and methane combination has also become the first choice for attitude control engines.

[0003] In order to use liquid oxygen-methane propellant as the fuel for attitude control engines, it is particularly important to design injectors and attitude control engines based on liquid oxygen-methane bipropellant. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an injector and an attitude control engine based on liquid oxygen-methane bipropellant.

[0005] The present invention provides an injector and an attitude control engine based on liquid oxygen and methane bipropellants, 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 tank is guided to the liquid collecting chamber, and flows through the centrifugal nozzle assembly and is sprayed to the nozzle; the spark plug is arranged on the injector body, and an ignition component of the spark plug is arranged near the outlet of the centrifugal nozzle assembly to ignite the propellant sprayed into the nozzle by the centrifugal nozzle assembly.

[0006] According to one embodiment of the present invention, the propellant in the tank is directed to the liquid collecting chamber through a filling nozzle; the liquid collecting chamber includes an oxygen collecting chamber and a methane collecting chamber; the centrifugal nozzle assembly includes an oxygen centrifugal nozzle and a methane centrifugal nozzle; the oxygen collecting chamber and the methane collecting chamber are respectively used to be connected to a filling nozzle to direct liquid oxygen and liquid methane to the oxygen centrifugal nozzle and the methane centrifugal nozzle respectively.

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

[0008] According to one embodiment of the present invention, the methane centrifugal nozzle is sleeved on the circumferential outer side surface of the oxygen centrifugal nozzle and a gap is set between them; liquid oxygen flows from the oxygen collecting chamber through the inner cavity of the oxygen centrifugal nozzle into the nozzle; liquid methane flows from the methane collecting chamber through the cavity formed by the circumferential inner side surface of the methane centrifugal nozzle and the circumferential outer side surface of the oxygen centrifugal nozzle into the nozzle.

[0009] According to one embodiment of the present invention, a plurality of oxygen nozzle tangential holes are arranged along the circumferential direction of the circumferential side surface of the oxygen centrifugal nozzle, and the oxygen nozzle tangential holes are used to connect the oxygen liquid collecting chamber and the inner cavity of the oxygen centrifugal nozzle; a plurality of methane nozzle tangential holes are arranged along the circumferential direction of the circumferential side surface of the methane centrifugal nozzle, and the methane nozzle tangential holes are used to connect the methane liquid collecting chamber and the cavity body of the methane centrifugal nozzle.

[0010] According to one embodiment of the present invention, the axial direction of the multiple oxygen nozzle tangential holes is set at an angle to the radial direction of the oxygen centrifugal nozzle; the axial direction of the multiple methane nozzle tangential holes is set at an angle to the radial direction of the methane centrifugal nozzle; the rotation direction of the multiple oxygen nozzle tangential holes is opposite to that of the multiple methane nozzle tangential holes.

[0011] According to one embodiment of the present invention, the outlet of the oxygen centrifugal nozzle and the outlet of the methane centrifugal nozzle are staggered, and the outlet of the methane centrifugal nozzle is close to the nozzle; the mist cone formed by the liquid oxygen sprayed from the oxygen centrifugal nozzle is tangent to the lip of the methane centrifugal nozzle outlet.

[0012] According to one embodiment of the present invention, a panel is provided on the end face downstream of the injector body; the panel is provided with a plurality of liquid methane cooling tangential holes, and the plurality of liquid methane cooling tangential holes are used to guide the liquid methane in the liquid methane collecting chamber to the vicinity of the nozzle side wall to cool the nozzle side wall.

[0013] According to one embodiment of the present invention, a plurality of acoustic cavity holes are arranged on the end surface of the panel opposite to the injector body.

[0014] On the other hand, the present invention provides an attitude control engine based on liquid oxygen-methane bipropellant, comprising: an injector and a nozzle as described above, wherein the injector is arranged at the head of the nozzle.

[0015] The injector based on liquid oxygen-methane bipropellant according to the present invention has a more compact structure and is easy to operate, and can improve the reliability of the injector operation.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and illustrative and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are a part of the specification of the present invention, and illustrate exemplary embodiments of the present invention. Together with the description of the specification, the accompanying drawings are used to explain the principles of the invention.

[0018] Figure 1 is a cross-sectional view of an attitude control engine based on liquid oxygen-methane bipropellant according to an embodiment of the present invention;

[0019] Figure 2 is a stereoscopic diagram of a flow channel of a liquid collecting chamber of an injector according to an embodiment of the present invention;

[0020] Figure 3 is a cross-sectional view of a centrifugal nozzle assembly according to one embodiment of the present invention;

[0021] Figure 4 yes Figure 3 Cross-section view in the AA direction;

[0022] Figure 5 yes Figure 3 Cross-sectional view in the mid-CC direction;

[0023] Figure 6 is a cross-sectional view of an injector according to an embodiment of the present invention;

[0024] Figure 7 yes Figure 6 Cross-sectional view along the BB direction.

[0025] Description of reference numerals:

[0026] 1-injector body; 2-nozzle; 3-centrifugal nozzle assembly; 4-spark plug; 5-takeover nozzle; 6-adjustment gasket; 7-panel; 11-oxygen collecting chamber; 12-methane collecting chamber; 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 various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are used to illustrate the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the sizes of some structural components or areas in the drawings may be enlarged for other structural components or areas to help understand the embodiments of the present invention.

[0028] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0029] In addition, the terms "include", "comprise", "have" or any other variations thereof are intended to cover non-exclusive inclusion, so that a structure or component including a series of elements includes not only those elements, but also other mechanical elements that are not explicitly listed or inherent in the structure or component. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the article or device including the elements.

[0030] Spatially related terms such as "below", "beneath", "under", "low", "above", "on", "high", etc. are used to facilitate description to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. In addition, for example, "one element is above / below 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 do not specifically refer to the meaning of order or sequence, and should not be regarded as limiting. Similar terms are used throughout the description to represent similar elements.

[0031] In the process of describing the present invention below, in certain scene descriptions, only "rocket", "launch vehicle", "spacecraft", "space launch vehicle" or "missile" may be used. This is only for the convenience of description, and its connotation is not limited to the specific words used. Generally, the rocket or launch vehicle of the present invention includes not only space launch vehicles for carrying satellites or spacecraft or other probes, but also various types of missiles, rockets and other weapons for carrying military payloads, as well as similar products that can send payloads into the air. When interpreting the above specific words, those skilled in the art shall not limit the rocket to only one of the launch vehicle or missile based on the specific words used to describe the scene, thereby narrowing the scope of protection of the present invention.

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

[0033] Figure 1 is a cross-sectional view of an attitude control engine based on liquid oxygen-methane bipropellant according to an embodiment of the present invention; Figure 2 is a stereoscopic diagram of a flow channel of a liquid collecting chamber of an injector according to an embodiment of the present invention; Figure 3 is a cross-sectional view of a centrifugal nozzle assembly according to one embodiment of the present invention; Figure 4 yes Figure 3 Cross-section view in the AA direction; Figure 5 yes Figure 3 Cross-sectional view in the mid-CC direction; Figure 6 is a cross-sectional view of an injector according to an embodiment of the present invention; Figure 7 yes Figure 6 Cross-sectional view along the BB direction.

[0034] like Figure 1 As shown, the present invention provides an injector based on liquid oxygen and methane bipropellant, comprising: an injector body 1, a centrifugal nozzle assembly 3 and a spark plug 4. The centrifugal nozzle assembly 3 is arranged on the injector body 1, and the injector body 1 is provided with a liquid collecting chamber. The propellant in the tank is directed to the liquid collecting chamber, and flows through the centrifugal nozzle assembly 3 and is sprayed into the nozzle 2. The spark plug 4 is arranged on the injector body 1, and the ignition component of the spark plug 4 is arranged near the outlet of the centrifugal nozzle assembly 3 to ignite the propellant sprayed into the nozzle 2 by the centrifugal nozzle assembly 3.

[0035] Specifically, compared with the traditional hydrazine-type self-igniting dual-element attitude control engine, liquid oxygen-methane propellant, as a non-self-igniting propellant combination, requires additional ignition elements to achieve reliable ignition. In addition, due to the small working flow of the attitude control engine, the low boiling point of the propellant, the heat back-invasion of the pulse operation, the heat leakage of the pipeline and other factors, the phase state of the propellant will be affected, further affecting the ignition reliability and steady-state / pulse operation. Generally speaking, ensuring the propellant inlet conditions and suppressing the phase change of the propulsion head are the key points and difficulties of the injector design.

[0036] The injector provided in this embodiment avoids the need for an additional torch ignition structure by arranging the ignition component of the spark plug 4 close to the outlet of the centrifugal nozzle assembly 3. The structure is more compact, the operation is simple, and the reliability of the injector operation is improved. For example, the centrifugal nozzle assembly 3 can be installed in the injector body 1 by brazing (for example, installed in the middle of the injector body 1). The spark plug 4 can be connected to the injector body 1 by threads, and the spark plug 4 can be installed in a position close to the side of the injector body 1. Alternatively, the spark plug 4 is arranged in the middle of the injector body 1, and the centrifugal nozzle assembly 3 is arranged in a position close to the side of the injector body 1. The nozzle 2 can be installed downstream of the injector body 1 by screws.

[0037] like Figure 2 and 3As shown, according to one embodiment of the present invention, the propellant in the tank is directed to the liquid collecting chamber through the take-over nozzle 5. The liquid collecting chamber includes an oxygen liquid collecting chamber 11 and a methane liquid collecting chamber 12. The centrifugal nozzle assembly 3 includes an oxygen centrifugal nozzle 31 and a methane centrifugal nozzle 32. The oxygen liquid collecting chamber 11 and the methane liquid collecting chamber 12 are respectively used to be connected to a take-over nozzle 5 to direct liquid oxygen and liquid methane to the oxygen centrifugal nozzle 31 and the methane centrifugal nozzle 32, respectively.

[0038] In this embodiment, liquid oxygen and liquid methane enter the oxygen collecting chamber 11 and the methane collecting chamber 12 respectively through the nozzle 5, and then are 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 burns in the nozzle 2. For example, the nozzle 5 can be installed on the upper part of the injector body 1 by welding. The injector adopts a design scheme of direct ignition with the spark plug 4 and the dual-path centrifugal nozzle, which has a more compact structure, simple operation, and improves the reliability of the engine operation.

[0039] like Figure 2 As shown, according to one embodiment of the present invention, at least part of the oxygen collecting chamber 11 is arranged around at least part of the methane collecting chamber 12 so that the liquid oxygen in the oxygen collecting chamber 11 cools the liquid methane in the liquid methane collecting chamber 12 .

[0040] In this embodiment, when the engine is started, the valves of the nozzles 5 are opened respectively, and liquid oxygen enters the oxygen collecting chamber 11 from one nozzle 5, and liquid methane enters the methane collecting chamber 12 from another nozzle 5. During the flow of liquid oxygen in the oxygen collecting chamber 11, the methane collecting chamber 12 is cooled, so that the liquid methane is prevented from being heated and vaporized, and the propellant is prompted to quickly reach the liquid phase when the engine is started, so as to stabilize the flow supply of the propellant and improve the reliability of the ignition work.

[0041] According to one embodiment of the present invention, at least part of the oxygen collecting chamber 11 and at least part of the methane collecting chamber 12 may be arranged in layers. For example, at least part of the oxygen collecting chamber 11 is arranged above at least part of the methane collecting chamber 12 .

[0042] According to one embodiment of the present invention, a vacuum insulation interlayer may be provided on the outer side of the oxygen liquid collecting chamber 11 and the methane liquid collecting chamber 12 to reduce heat exchange between the propellant and the outside and improve the cooling efficiency of liquid oxygen on liquid methane, which can effectively suppress the phase change of small flow rate propellant.

[0043] like Figure 2 and 3As shown, according to one embodiment of the present invention, the methane centrifugal nozzle 32 is sleeved on the circumferential outer side of the oxygen centrifugal nozzle 31, and a gap is set between them. Liquid oxygen flows from the oxygen collecting chamber 11 through the inner cavity of the oxygen centrifugal nozzle 31 and enters the nozzle 2. Liquid methane flows from the methane collecting chamber 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 this embodiment, for example, the methane centrifugal nozzle 32 and the oxygen centrifugal nozzle 31 may be connected by welding.

[0045] like Figure 4 and 5 As shown, according to one embodiment of the present invention, the circumferential side surface of the oxygen centrifugal nozzle 31 is provided with a plurality of oxygen nozzle tangential holes 311 along its circumferential direction, and the oxygen nozzle tangential holes 311 are used to connect the oxygen liquid collecting chamber 11 and the inner cavity of the oxygen centrifugal nozzle 31. The circumferential side surface of the methane centrifugal nozzle 32 is provided with a plurality of methane nozzle tangential holes 321 along its circumferential direction, and the methane nozzle tangential holes 321 are used to connect the methane liquid collecting chamber 12 and the cavity of the methane centrifugal nozzle 32.

[0046] like Figure 4 and 5 As shown, according to one embodiment of the present invention, the axial direction of the plurality of oxygen nozzle tangential holes 311 is arranged at an angle to 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 to the radial direction of the methane centrifugal nozzle 32. The plurality of oxygen nozzle tangential holes 311 and the plurality of methane nozzle tangential holes 321 have opposite rotation directions.

[0047] In this embodiment, liquid oxygen is sprayed into the inner cavity of the oxygen centrifugal nozzle 31 through the oxygen nozzle tangential hole 311, forming a vortex in the inner cavity and being atomized. Liquid methane is sprayed into the inner cavity of the methane centrifugal nozzle 32 through the methane nozzle tangential hole 321, forming a vortex in the inner cavity and being atomized. The injector adopts a double-path counter-rotating centrifugal nozzle, in which the oxygen nozzle tangential hole 311 and the methane nozzle tangential hole 321 rotate in opposite directions, which can promote the mixing, crushing and atomization of liquid oxygen and liquid methane, so that the liquid oxygen and liquid methane are mixed more fully.

[0048] According to one embodiment of the present invention, the outlet of the oxygen centrifugal nozzle 31 and the outlet of the methane centrifugal nozzle 32 are arranged in a staggered manner, and the outlet of the methane centrifugal nozzle 32 is close to the nozzle 2. The spray 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 spray cone formed by liquid oxygen sprayed through the oxygen centrifugal nozzle 31 collides with the cone angle of the spray cone formed by the outer circle through the methane centrifugal nozzle 32, triggering the liquid film suction effect, so that the liquid oxygen and liquid methane are mixed to form a liquid film spray cone. At the outlet of the methane centrifugal nozzle 32, the liquid film spray cone is ignited by the pulse discharge of the spark plug 4, and the combustion gas is sprayed out from the nozzle 2.

[0050] like Figure 1 and 6 As shown, according to one embodiment of the present invention, an adjusting gasket 6 is provided along the circumferential direction of the contact between the handle of the spark plug 4 and the injector body 1. By replacing the adjusting gasket 6 of different thicknesses, the depth of the spark plug 4 inserted into or screwed 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 adjustment gasket 6 to the injector body 1. The injector can adjust the position of the ignition component of the spark plug 4 by adjusting the depth of the spark plug 4 inserted into the injector body 1. For example, the injector can adjust the distance from the electrode head of the spark plug 4 to the downstream end face of the injector body 1. The injector improves the reliability of the engine ignition work by controlling the ignition position.

[0052] like Figure 2 , 6 As shown in FIG. 7 , according to one embodiment of the present invention, a panel 7 is provided on the downstream end surface of the injector body 1. The panel 7 is provided with a plurality of liquid methane cooling tangential holes 121, and the plurality of liquid methane cooling tangential holes 121 are used to guide 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 the present embodiment, the injector body 1, the panel 7 and the centrifugal nozzle assembly 3 together constitute the oxygen liquid collecting chamber 11 and the methane liquid collecting chamber 12 which are isolated from each other. For example, the axial direction of the liquid methane cooling tangential hole 121 is set at an angle to the circumferential direction of the panel 7 or the injector body 1. Part of the methane is swirl-ejected to the nozzle 2 through the liquid methane cooling tangential hole 121 to cool the inner wall of the high-temperature nozzle 2. For example, the panel 7 can be installed on the injector body 1 by laser welding. The methane path of the injector adopts an integrated central double-path counter-rotating centrifugal nozzle and a side zone swirl cooling structure design, which improves the reliability of small-flow methane side zone cooling.

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

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

[0056] On the other hand, the present invention provides an attitude control engine based on liquid oxygen-methane bipropellant, comprising the above-mentioned injector and nozzle 2, wherein the injector is arranged at the head of the nozzle 2.

[0057] In this embodiment, the injector body 1 and the nozzle 2 of the injector form a combustion chamber for burning the 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 nozzles 5 connecting the two propellants are opened respectively, and liquid oxygen enters the oxygen collecting chamber 11 through the nozzles 5, and is sprayed out and atomized through the oxygen nozzle tangential hole 311 of the oxygen centrifugal nozzle 31; at the same time, liquid methane enters the methane collecting chamber 12 (cooled by liquid oxygen) through another nozzle 5, and is sprayed out and atomized 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, part of the liquid methane flows through the methane collecting chamber 12 (for example, flows through the methane collecting chamber of the lower layer), and is swirled out from the liquid methane cooling tangential hole 121 in the edge area to the side wall of the nozzle 2, thereby cooling the side wall of the nozzle 2.

[0059] Those skilled in the art can understand that the present invention uses liquid oxygen and liquid methane as propellants to illustrate the structure and working principle of the injector and attitude control engine, and is not intended to limit the protection scope of the present invention. For example, the present invention provides injectors and attitude control engines that are also applicable to low-temperature bicomponent non-hypergolic propellant combinations such as liquid oxygen / liquid hydrogen and liquid oxygen / kerosene.

[0060] The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

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

Claims

1. Injector based on liquid oxygen-methane bipropellant, characterized in that: include: 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 tank is directed to the liquid collecting chamber, flows through the centrifugal nozzle assembly and is sprayed into the nozzle; the spark plug is arranged on the injector body, and the ignition component of the spark plug is arranged near the outlet of the centrifugal nozzle assembly to ignite the propellant sprayed into the nozzle by the centrifugal nozzle assembly.

2. The injector according to claim 1, characterized in that The propellant in the tank is directed to the liquid collecting chamber through the nozzle; the liquid collecting chamber includes an oxygen liquid collecting chamber and a methane liquid collecting chamber; the centrifugal nozzle assembly includes an oxygen centrifugal nozzle and a methane centrifugal nozzle; The oxygen liquid collecting chamber and the methane liquid collecting chamber are respectively used to be connected to a take-over nozzle to guide the liquid oxygen and liquid methane to the oxygen centrifugal nozzle and the methane centrifugal nozzle respectively.

3. The injector according to claim 2, characterized in that At least a portion of the oxygen collecting chamber is disposed around at least a portion of the methane collecting chamber, so that the liquid oxygen in the oxygen collecting chamber cools the liquid methane in the liquid methane collecting chamber.

4. The injector according to claim 2, characterized in that The methane centrifugal nozzle is sleeved on the circumferential outer side of the oxygen centrifugal nozzle and is spaced apart from each other; liquid oxygen flows from the oxygen collecting chamber through the inner cavity of the oxygen centrifugal nozzle into the nozzle; Liquid methane flows from the methane liquid collecting chamber through a cavity formed by the circumferential inner side surface of the methane centrifugal nozzle and the circumferential outer side surface of the oxygen centrifugal nozzle and enters the nozzle.

5. The injector according to claim 4, characterized in that The circumferential side surface of the oxygen centrifugal nozzle is provided with a plurality of oxygen nozzle tangential holes along its circumferential direction, and the oxygen nozzle tangential holes are used to connect the oxygen liquid collecting chamber and the inner cavity of the oxygen centrifugal nozzle; the circumferential side surface of the methane centrifugal nozzle is provided with a plurality of methane nozzle tangential holes along its circumferential direction, and the methane nozzle tangential holes are used to connect the methane liquid collecting chamber and the cavity body of the methane centrifugal nozzle.

6. The injector according to claim 5, characterized in that The axial direction of the multiple oxygen nozzle tangential holes is set at an angle to the radial direction of the oxygen centrifugal nozzle; the axial direction of the multiple methane nozzle tangential holes is set at an angle to the radial direction of the methane centrifugal nozzle; the rotation direction of the multiple oxygen nozzle tangential holes is opposite to that of the multiple methane nozzle tangential holes.

7. The injector according to claim 4, characterized in that The outlet of the oxygen centrifugal nozzle and the outlet of the methane centrifugal nozzle are arranged in a staggered manner, and the outlet of the methane centrifugal nozzle is close to the nozzle; the mist cone formed by the liquid oxygen sprayed from the oxygen centrifugal nozzle is tangent to the lip of the outlet of the methane centrifugal nozzle.

8. The injector according to claim 2, characterized in that A panel is arranged on the end face downstream of the injector body; the panel is provided with a plurality of liquid methane cooling tangential holes, and the plurality of liquid methane cooling tangential holes are used to guide the liquid methane in the liquid methane collecting chamber to the vicinity of the nozzle side wall to cool the nozzle side wall.

9. The injector according to claim 8, characterized in that A plurality of acoustic cavity holes are arranged on the end surface of the panel opposite to the injector body.

10. An attitude control engine based on liquid oxygen and methane bipropellant, characterized in that: It comprises the injector and the nozzle as described in any one of claims 1 to 9, wherein the injector is arranged at the head of the nozzle.

Images