Injector and attitude control engine based on liquid oxygen and methane bipropellant

Abstract

The application provides a liquid oxygen-methane bipropellant-based injector and attitude control engine, wherein 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; the propellant in a storage tank is guided to the liquid collecting cavity and sprayed to a nozzle through the centrifugal nozzle assembly; the spark plug is arranged on the injector body, and an ignition part of the spark plug is arranged close to an outlet of the centrifugal nozzle assembly to ignite the propellant sprayed to the nozzle by the centrifugal nozzle assembly. The injector structure is more compact, and the reliability of the injector operation can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid rocket, in particular to the injector and attitude control engine based on liquid oxygen and methane bipropellant. BACKGROUND

[0002] The existing attitude control engine mostly adopts natural propellant combination of 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 and methane, liquid oxygen and liquid hydrogen. In view of the excellent performance in all aspects, the liquid oxygen and methane combination has become the first choice for attitude control engine.

[0003] In order to use liquid oxygen and methane propellant as fuel for attitude control engine, it is particularly important to design an injector and attitude control engine based on liquid oxygen and methane bipropellant. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide an injector and attitude control engine based on liquid oxygen and methane bipropellant.

[0005] The present application provides an injector and attitude control engine based on liquid oxygen and methane bipropellant, 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 cavity; the propellant in the storage tank is guided to the liquid collecting cavity and flows through the centrifugal nozzle assembly to be injected into the nozzle; the spark plug is arranged on the injector body, and the ignition part of the spark plug is arranged near the outlet of the centrifugal nozzle assembly to ignite the propellant injected into the nozzle by the centrifugal nozzle assembly.

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

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

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

[0009] According to one embodiment of the present application, 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 collecting cavity 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 collecting cavity and the cavity of the methane centrifugal nozzle.

[0010] According to one embodiment of the present application, 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.

[0011] According to one embodiment of the present application, the outlet of the oxygen centrifugal nozzle is arranged with a gap from 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 from the oxygen centrifugal nozzle is tangent to the lip of the outlet of the methane centrifugal nozzle.

[0012] According to one embodiment of the present application, 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 methane collecting cavity to the vicinity of the nozzle sidewall to cool the nozzle sidewall.

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

[0014] In another aspect, the present application provides a liquid oxygen and methane bipropellant-based attitude control engine, which comprises the injector and the nozzle as described above, and the injector is arranged at the head of the nozzle.

[0015] According to the liquid oxygen and methane bipropellant-based injector of the present application, the structure is more compact, the operation is simple, and the reliability of the operation of the injector can be improved.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are part of the specification of this invention, illustrate exemplary embodiments of the invention. The drawings, together with the description in the specification, serve to illustrate the principles of the invention.

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

[0019] Figure 2 This is a perspective view of the flow channel of the liquid collection chamber of the injector according to an embodiment of the present invention;

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

[0021] Figure 4 yes Figure 3 Cross-sectional view along the AA direction;

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

[0023] Figure 6 This 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] Explanation of reference numerals in the attached figures:

[0026] 1-Injector body; 2-Nozzle; 3-Centrifugal nozzle assembly; 4-Spark plug; 5-Connecting nozzle; 6-Adjusting shim; 7-Panel; 11-Oxygen collection chamber; 12-Methane collection 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 Implementation

[0027] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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 to exemplify 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 dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of the present invention.

[0028] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the embodiments of the present application. In the description of the present application, it should be noted that, unless otherwise specified, the terms "mounting", "connection", "connecting" should be interpreted 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 present application 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 structural elements or components not only includes those elements, but also includes other elements 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 description to explain the position 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 intended to specifically refer to order or sequence, and should not be considered as limiting. Similar terms are used throughout the description to indicate similar elements.

[0031] In the following description of the present application, "rocket", "launch vehicle", "spacecraft", "space launch vehicle" or "missile" may be used in some context descriptions, which are only for the convenience of description, and the connotation is not limited to the specific word used. Generally, the rocket or launch vehicle of the present application 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, as well as similar products capable of sending payloads into the air. Those skilled in the art should not limit the rocket to only one of the launch vehicle or the missile based on the specific word used in the description context, thereby narrowing the scope of protection of the present application.

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

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

[0034] As shown in Figure 1 , the present application provides an injector based on liquid oxygen-methane bipropellant, comprising: an injector body 1, a centrifugal nozzle assembly 3, and a spark plug 4. The centrifugal nozzle assembly 3 is arranged in the injector body 1, and the injector body 1 is provided with a collector chamber. The propellant in the tank is guided to the collector chamber and flows through the centrifugal nozzle assembly 3 to be injected into the nozzle 2. The spark plug 4 is arranged in the injector body 1, and the ignition part of the spark plug 4 is arranged close to the outlet of the centrifugal nozzle assembly 3 to ignite the propellant injected into the nozzle 2 by the centrifugal nozzle assembly 3.

[0035] Specifically, compared with the traditional hydrazine-based auto-ignition type bipropellant attitude control engine, the liquid oxygen-methane propellant, as a non-auto-ignition propellant combination, needs an additional ignition element to achieve reliable ignition. In addition, due to the small working flow rate of the attitude control engine, the low boiling point of the propellant, the thermal backflow of pulse operation, the pipeline heat leakage and other factors, the phase state of the propellant will be affected, which further affects the ignition reliability and steady / pulse operation. Generally, the key and difficulty of the injector design is to ensure the propellant inlet conditions and to inhibit the phase change of the propellant head.

[0036] The injector provided by the present embodiment avoids the additional addition of torch ignition structure by arranging the ignition part of the spark plug 4 close to the outlet of the centrifugal nozzle assembly 3, and 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 (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 threads, and the spark plug 4 can be installed at a 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 a position close to the side edge of the injector body 1. The nozzle 2 can be installed downstream of the injector body 1 by screws.

[0037] As shown in Figure 2 and 3As shown, according to one embodiment of the present invention, the propellant in the tank is guided to the liquid collection chamber through the connecting nozzle 5. The liquid collection chamber includes an oxygen collection chamber 11 and a methane collection chamber 12. The centrifugal nozzle assembly 3 includes an oxygen centrifugal nozzle 31 and a methane centrifugal nozzle 32. The oxygen collection chamber 11 and the methane collection chamber 12 are respectively connected to a connecting nozzle 5 to guide 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 collection chamber 11 and methane collection chamber 12 respectively through the connecting nozzle 5, and are then injected into the nozzle 2 by the oxygen centrifugal nozzle 31 and methane centrifugal nozzle 32, where they are ignited by the spark plug, thus causing the propellant to burn in the nozzle 2. For example, the connecting nozzle 5 can be welded to the upper part of the injector body 1. This injector adopts a direct ignition design using a spark plug 4 and dual-path centrifugal nozzles, resulting in a more compact structure, simpler operation, and improved engine reliability.

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

[0040] In this embodiment, when the engine starts, the valves of the connecting pipes 5 are opened respectively. Liquid oxygen enters the oxygen collection chamber 11 through one connecting pipe 5, and liquid methane enters the methane collection chamber 12 through the other connecting pipe 5. During the flow of liquid oxygen in the oxygen collection chamber 11, it cools the methane collection chamber 12, preventing the liquid methane from vaporizing due to heat. This promotes the propellant to quickly reach the liquid phase region when the engine starts, thereby stabilizing the propellant flow supply and improving the reliability of ignition.

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

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

[0043] like Figure 2 and 3As shown, 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 between each other. Liquid oxygen flows from the oxygen liquid collection cavity 11 through the inner cavity of the oxygen centrifugal nozzle 31 into the injector 2. Liquid methane flows from the methane liquid collection cavity 12 through the cavity formed between the circumferential inner side of the methane centrifugal nozzle 32 and the circumferential outer side of the oxygen centrifugal nozzle 31 into the injector 2.

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

[0045] As shown in Figs. 1 and 2, 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, which are used to communicate the oxygen liquid collection 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, which are used to communicate the methane liquid collection cavity 12 and the cavity of the methane centrifugal nozzle 32. Figure 4 5 As shown in Figs. 1 and 2, 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 rotational directions of the plurality of oxygen nozzle tangential holes 311 and the plurality of methane nozzle tangential holes 321 are opposite.

[0046] As shown in Figs. 1 and 2, 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 rotational directions of the plurality of oxygen nozzle tangential holes 311 and the plurality of methane nozzle tangential holes 321 are opposite. Figure 4 5 As shown in Figs. 1 and 2, 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 rotational directions of the plurality of oxygen nozzle tangential holes 311 and the plurality of methane nozzle tangential holes 321 are opposite.

[0047] In this embodiment, 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 and is atomized in the inner cavity. 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 and is atomized in the inner cavity. This injector adopts a double-path counter-rotational centrifugal nozzle, in which the rotational 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 liquid oxygen and liquid methane, and make the mixing of liquid oxygen and liquid methane more sufficient.

[0048] According to one embodiment of the present application, the outlet of the oxygen centrifugal nozzle 31 and the outlet of the methane centrifugal nozzle 32 are arranged staggered, and the outlet of the methane centrifugal nozzle 32 is close to the injector 2. The spray cone formed by the liquid oxygen injected out of the oxygen centrifugal nozzle 31 is tangent to the lip of the outlet of the methane centrifugal nozzle 32.

[0049] ​​In the embodiment, the liquid oxygen mist cone formed by the oxygen centrifugal nozzle 31 collides with the cone angle of the liquid methane mist cone formed by the methane centrifugal nozzle 32, triggering the liquid film absorption 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 spark plug 4, and the combustion gas is ejected from the nozzle 2.

[0050] As shown in Figure 1 and 6 , according to an embodiment of the present application, an adjusting washer 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 the adjusting washer 6 with different thickness, the depth of the spark plug 4 inserted into or rotated out of the injector body 1 can be adjusted.

[0051] In the embodiment, by screwing the spark plug 4, the handle of the spark plug 4 can press the adjusting washer 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 distance between the electrode head of the spark plug 4 and the downstream end surface of the injector body 1 can be adjusted. By controlling the ignition position, the reliability of the engine ignition operation can be improved.

[0052] As shown in Figure 2 , 6 and 7, according to an embodiment of the present application, a panel 7 is arranged at the downstream end surface of the injector body 1. The panel 7 is provided with a plurality of liquid methane cooling tangential holes 121 for guiding the liquid methane in the methane liquid collection 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 embodiment, the injector body 1, the panel 7 and the centrifugal nozzle assembly 3 jointly constitute the oxygen liquid collection chamber 11 and the methane liquid collection 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 panel 7 or the injector body 1. Part of the methane is ejected in a rotational flow through 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 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 edge area rotational flow cooling structure design, which improves the reliability of small-flow methane edge area cooling.

[0054] As shown in Figure 7 , according to an embodiment of the present application, a plurality of acoustic cavity holes 13 are arranged at the end surface of the panel 7 opposite to the injector body 1.

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

[0056] In another aspect, the present application provides a liquid oxygen-methane bipropellant-based attitude control engine, which comprises the injector and the nozzle 2, and the injector is arranged at the head of the nozzle 2.

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

[0058] For example, during the operation of the attitude control engine, the control valves connected to the two propellant pipes 5 are opened respectively, the liquid oxygen enters the oxygen collecting cavity 11 through the pipe 5, and is sprayed and atomized through the tangential hole 311 of the oxygen nozzle of the oxygen centrifugal nozzle 31; at the same time, the liquid methane enters the methane collecting cavity 12 (cooled by the liquid oxygen) through the other pipe 5, and is sprayed and atomized through the tangential hole 321 of the methane nozzle of the methane centrifugal nozzle 32. After the liquid methane and the liquid oxygen are mixed, atomized and evaporated at the lip of the methane centrifugal nozzle 32, the stable flame is ignited by the side spark plug 4. In addition, part of the liquid methane flows through the methane collecting cavity 12 (for example, flows through the lower part of the methane collecting cavity), and is sprayed to the side wall of the nozzle 2 through the tangential hole 121 of the side area of the methane collecting cavity, so as to cool the side wall of the nozzle 2.

[0059] Those skilled in the art can understand that the present application takes the liquid oxygen and the liquid methane as examples of the propellant, and describes the structure and working principle of the injector and the attitude control engine, which does not limit the protection scope of the present application. For example, the present application is provided for the injector and the attitude control engine, and is also applicable to the combination of the liquid oxygen / liquid hydrogen, the liquid oxygen / kerosene and other low-temperature bipropellant non-self-igniting propellants.

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

[0061] The above only describes the preferred embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An injector based on a liquid oxygen-methane bicomponent propellant, characterized in that, include: The injector body, centrifugal nozzle assembly, and spark plug are provided; the centrifugal nozzle assembly is disposed on the injector body, and the injector body is provided with a liquid collection chamber; the propellant in the tank is guided to the liquid collection chamber and flows through the centrifugal nozzle assembly to be sprayed into the nozzle; the spark plug is disposed on the injector body, and the ignition part of the spark plug is disposed near the outlet of the centrifugal nozzle assembly to ignite the propellant sprayed into the nozzle by the centrifugal nozzle assembly; The propellant in the tank is guided to the liquid collection chamber through a nozzle; the liquid collection chamber includes an oxygen liquid collection chamber and a methane liquid collection chamber; the centrifugal nozzle assembly includes an oxygen centrifugal nozzle and a methane centrifugal nozzle. The oxygen collection chamber and the methane collection chamber are respectively connected to a connecting nozzle to guide liquid oxygen and liquid methane to the oxygen centrifugal nozzle and the methane centrifugal nozzle, respectively. At least a portion of the oxygen collecting chamber is arranged 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 methane collecting chamber.

2. The injector according to claim 1, characterized in that, The methane centrifugal nozzle is sleeved on the circumferential outer side of the oxygen centrifugal nozzle, and there is a gap between them; liquid oxygen flows from the oxygen collection chamber through the inner cavity of the oxygen centrifugal nozzle and enters the nozzle pipe. Liquid methane flows from the methane collection chamber through the cavity formed by the inner circumferential side of the methane centrifugal nozzle and the outer circumferential side of the oxygen centrifugal nozzle, and enters the nozzle.

3. The injector according to claim 2, characterized in that, The oxygen centrifugal nozzle has a plurality of oxygen nozzle tangential holes arranged along its circumferential direction on its circumferential side surface. The oxygen nozzle tangential holes are used to connect the oxygen collection chamber and the inner cavity of the oxygen centrifugal nozzle. The methane centrifugal nozzle has a plurality of methane nozzle tangential holes arranged along its circumferential direction on its circumferential side surface. The methane nozzle tangential holes are used to connect the methane collection chamber and the cavity of the methane centrifugal nozzle.

4. The injector according to claim 3, characterized in that, The axial direction of the plurality of oxygen nozzle tangential holes is set at an angle to the radial direction of the oxygen centrifugal nozzle; the axial direction of the plurality of methane nozzle tangential holes is set at an angle to the radial direction of the methane centrifugal nozzle; the rotation direction of the plurality of oxygen nozzle tangential holes is opposite to that of the plurality of methane nozzle tangential holes.

5. The injector according to claim 2, characterized in that, The outlet of the oxygen centrifugal nozzle is staggered with the outlet of the methane centrifugal nozzle, and the outlet of the methane centrifugal nozzle is close to the nozzle pipe; the mist cone formed by the liquid oxygen ejected from the oxygen centrifugal nozzle is tangent to the lip of the outlet of the methane centrifugal nozzle.

6. The injector according to claim 1, characterized in that, A panel is provided on the downstream end face of the injector body; the panel is provided with a plurality of liquid methane cooling tangential holes, which are used to guide the liquid methane in the methane collection chamber to the vicinity of the nozzle sidewall to cool the nozzle sidewall.

7. The injector according to claim 6, characterized in that, The end face of the panel opposite to the injector body is provided with multiple acoustic cavity holes.

8. An attitude control engine based on a liquid oxygen-methane bicomponent propellant, characterized in that, Includes an injector and a nozzle as described in any one of claims 1-7, wherein the injector is disposed at the head of the nozzle.

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