Pintle type injector and engine thrust chamber

Abstract

The invention discloses a pintle type injector and an engine thrust chamber, and relates to the technical field of engine thrust chambers, pintle head regeneration cooling runner ribs surrounding the side wall of a pintle inner cylinder are arranged at the lower end of the pintle inner cylinder of the pintle type injector, and liquid oxygen radial injection holes are formed in the wall of the pintle inner cylinder by gaps between the adjacent pintle head regeneration cooling runner ribs. A gap between every two adjacent pintle head regeneration cooling runner ribs forms a pintle head regeneration cooling runner at the bottom of the pintle inner cylinder; the engine thrust chamber comprises a pintle injector, a first methane liquid collecting cavity, a thrust chamber, a second methane liquid collecting cavity, a torch type igniter and a regenerative cooling jacket. By arranging the needle plug head regeneration cooling runner ribs and the liquid oxygen radial injection holes, radial injection of liquid oxygen and regeneration cooling of the needle plug inner cylinder are achieved, and the cooling performance is improved. And the thrust chamber and the regenerative cooling jacket are integrally formed and manufactured by adopting an additive manufacturing technology, so that the relatively large momentum ratio and combustion efficiency are realized under the same working condition without changing the flow and the injection area.

Description

Technical Field

[0001] The invention relates to the technical field of engine thrust chambers, and in particular to a pintle injector using regenerative cooling and a reusable variable thrust liquid oxygen-methane engine thrust chamber using the pintle injector. Background Art

[0002] The thrust chamber of a liquid rocket engine is one of the core components of the propulsion system, responsible for converting chemical energy into kinetic energy and generating thrust to propel the spacecraft. With the diversification of space missions and the rapid development of commercial spaceflight, the demand for high-performance, variable-thrust, and reusable liquid rocket engines is increasing. Liquid oxygen-methane, as an emerging propellant combination, has become a hot topic in current research and development due to its high efficiency, environmental protection, and potential low-cost advantages. In this context, the design and optimization of the thrust chamber has become the key to improving the overall performance of the engine.

[0003] Regenerative cooling is a thermal management technology widely used in liquid rocket engine thrust chambers to protect the thrust chambers and nozzles from damage by high-temperature combustion gases. By utilizing the propellant (usually fuel or oxidizer) to absorb heat as it flows through the thrust chamber walls, regenerative cooling effectively reduces the wall temperature and improves the thermal efficiency and reliability of the engine. This technology is particularly important in high-performance rocket engines because it can ensure the structural integrity and long-term operation of the engine in extreme thermal environments. In addition, compared with ablative cooling and capacitive cooling, regenerative cooling can better meet the needs of multiple reuse engines.

[0004] Ignitors include electric powder igniters, electric spark igniters and self-igniting igniter igniters, but these ignition methods cannot meet the needs of multiple ignitions in the air with variable thrust.

[0005] The traditional panel injector is an injector design that was used earlier in liquid rocket engines. Its main feature is that fuel and oxidizer are injected into the combustion chamber through multiple fixed injection holes. Panel injectors can have very complex structures depending on their injection method and are prone to combustion instabilities, such as high-frequency combustion instability and longitudinal acoustic vibration instability. In addition, since the injection holes are fixed, panel injectors have limitations in thrust regulation and it is difficult to achieve precise thrust control. The corresponding pintle injector can finely control the injection area through a mechanical actuator or motor drive.

[0006] Traditional needle plug head protection technologies include: one is to use high temperature resistant alloys such as copper-zirconium alloy as the needle plug head material for capacitive heat cooling, but the disadvantage is that the cost is significantly increased; the other is to open a hole in the center of the needle plug head to guide a part of the liquid oxygen to spray out from the needle plug head, or add a centrifugal component to make the liquid oxygen form a liquid film on the surface of the needle plug head for cooling effect, but the disadvantage of this cooling method is that a part of the liquid oxygen will not be fully mixed, especially under low flow conditions, the proportion of liquid oxygen ejected from the middle will increase significantly, further reducing the atomization efficiency and combustion efficiency.

[0007] Therefore, a pintle injector and an engine thrust chamber that can improve the cooling effect of the pintle head have become issues that need to be urgently addressed. Summary of the invention

[0008] The purpose of the present invention is to solve the negative impact of the traditional pintle head cooling solution on cost and combustion efficiency, achieve a larger momentum ratio and combustion efficiency without changing the flow rate and injection area under the same working conditions; separate the mechanical actuator and the deep cold liquid oxygen working conditions to improve the stability of the actuator. Solve the problem that the traditional torch igniter is expensive and other igniter methods cannot achieve multiple ignitions.

[0009] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a pintle-type injector, comprising a pintle inner cylinder and a head guide plate; the upper part of the pintle inner cylinder is surrounded by a plurality of liquid oxygen path curved holes connecting the inner and outer spaces of the pintle inner cylinder; the inner space of the pintle inner cylinder is a pintle liquid oxygen flow channel;

[0010] The lower end of the needle plug inner cylinder is provided with a needle plug head regeneration cooling flow channel rib surrounding its side wall, the gap between adjacent needle plug head regeneration cooling flow channel ribs forms a liquid oxygen radial injection hole on the wall of the needle plug inner cylinder, and the gap between adjacent needle plug head regeneration cooling flow channel ribs forms a needle plug head regeneration cooling flow channel at the bottom of the needle plug inner cylinder;

[0011] The head guide plate is fixed on the top of the needle plug head regeneration cooling channel rib and gradually extends and rises from the outer wall of the needle plug inner tube to the middle. The center of the head guide plate is provided with a central intercepting hole that runs through the top and the bottom.

[0012] Furthermore, the bottom of the inner cylinder of the needle plug protrudes downward to form an outwardly convex arc-shaped bottom surface, and a needle plug head guide cone corresponding to the central intercepting hole is provided at the center of the arc-shaped bottom surface.

[0013] Furthermore, the needle plug head regeneration cooling channel rib extends from the outer wall of the needle plug inner tube to the inner center and the lower end of the needle plug head regeneration cooling channel rib is fixed on the arc bottom surface.

[0014] The present invention also provides an engine thrust chamber, comprising a pintle injector, a first methane liquid collecting chamber, a thrust chamber, a second methane liquid collecting chamber, a torch igniter and a regenerative cooling jacket;

[0015] The pintle injector is fixed to the top of the thrust chamber through a head sleeve and the lower end thereof extends to the inside of the thrust chamber. A liquid oxygen main pipe inlet is provided on one side of the pintle injector and passes through the head sleeve to connect to an external oxygen supply device. The torch-type igniter is fixed to the top of the thrust chamber and the ignition end thereof extends to the inside of the thrust chamber.

[0016] The first methane liquid collecting chamber surrounds the lower end of the thrust chamber and is provided with a methane main pipeline inlet, and the inner wall of the first methane liquid collecting chamber is provided with a methane first liquid collecting chamber entry regeneration cooling flow channel hole connected to the regeneration cooling jacket;

[0017] The second methane liquid collecting chamber surrounds the top of the thrust chamber, and a second methane liquid collecting channel connected to the regeneration cooling jacket is provided inside the second methane liquid collecting chamber;

[0018] The regenerative cooling jacket is arranged inside the side wall of the thrust chamber and extends radially along the thrust chamber to communicate with the first methane liquid collecting chamber and the second methane liquid collecting chamber.

[0019] Further, the torch-type igniter comprises an igniter combustion chamber, a spark plug, an oxygen inlet, a methane inlet, a methane liquid collecting chamber and an igniter flame tongue channel;

[0020] The spark plug is fixed on the upper part of the igniter combustion chamber and the ignition end extends into the interior thereof, the gas oxygen inlet is arranged at the top of the igniter combustion chamber, the methane inlet is arranged on the side wall of the igniter combustion chamber and extends downward to be connected to the methane liquid collecting chamber, the methane liquid collecting chamber is arranged around the lower end of the igniter combustion chamber, the inner wall of the methane liquid collecting chamber is provided with a methane near-wall centrifugal injection hole connected to the igniter combustion chamber, and the igniter flame tongue channel is arranged at the lower end of the igniter combustion chamber and is connected to the thrust chamber.

[0021] Furthermore, a needle plug outer cylinder extending downward is provided at the top center of the thrust chamber, and the needle plug outer cylinder wraps the needle plug inner cylinder; the inner wall of the bottom of the second methane liquid collecting chamber extends toward the top center of the thrust chamber and the end is bent downward to surround the needle plug outer cylinder, forming a methane axial injection annular gap between the needle plug outer cylinder and the inner wall of the bottom of the second methane liquid collecting chamber.

[0022] Furthermore, the end of the needle plug head regeneration cooling channel rib extends to the outside of the needle plug inner tube, and a slot is formed between two adjacent needle plug head regeneration cooling channel ribs on the outside, and a latch tooth is provided at the lower end of the needle plug outer tube, and the latch tooth is inserted into the slot to connect and fix the needle plug inner tube and the needle plug outer tube.

[0023] Furthermore, the thrust chamber includes an expansion section, a convergent section and a cylindrical section that are smoothly connected from bottom to top, the expansion section is wide at the bottom and narrow at the top, the convergent section is wide at the top and narrow at the bottom and the lower end is connected to the expansion section, a throat is formed at the connection between the two, which is the narrowest section of the thrust chamber, and the lower end of the cylindrical end is connected to the top of the convergent section.

[0024] Furthermore, the regenerative cooling jacket includes a plurality of guide ribs extending from bottom to top along the thrust chamber, and guide channels are formed between adjacent guide ribs.

[0025] Furthermore, a methane second liquid collecting chamber rib smoothly connected to the top of the guide rib is provided in the methane second liquid collecting chamber, and the methane second liquid collecting channel is located between two adjacent methane second liquid collecting chamber ribs.

[0026] The advantages of the present invention compared with the prior art are:

[0027] The present invention realizes radial injection of liquid oxygen and regenerative cooling of the inner cylinder of the pintle by arranging the pintle head regenerative cooling channel ribs and the radial injection hole of liquid oxygen, thereby improving the cooling performance.

[0028] The thrust chamber and regenerative cooling jacket of the present invention are integrally formed by additive manufacturing technology, avoiding the difficulty and instability of the complex multi-layer structure of regenerative cooling in traditional manufacturing and welding, and making it possible to implement a thermal protection scheme for regenerative cooling in the needle plug head that requires high precision, thereby reducing the negative impact of the traditional needle plug head cooling scheme on cost and combustion efficiency, and achieving a larger momentum ratio and combustion efficiency without changing the flow rate and injection area under the same working conditions, especially solving the shortcoming that it is difficult to finely control the flow rate of liquid oxygen under low working conditions.

[0029] The inner and outer sleeves and the tooth structure of the pintle inner and outer sleeves can keep the radial liquid oxygen injection hole intact under different working conditions and different injection conditions, thereby improving the injection effect. The mechanical actuating mechanism connected to the top of the pintle injector avoids the deep cold working condition of the liquid oxygen, and improves the reliability and stability of the structure.

[0030] The torch-type igniter of the present invention can have the advantage of greatly reducing costs, is compatible with a variety of iridium spark plugs, does not require specialized redesign, and can accommodate two spark plugs at the same time, which can be used as a 100% redundant design, thereby improving the risk resistance of the ignition system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the cross section of the pintle injector Figure 1 .

[0032] Figure 2 is the cross section of the pintle injector Figure 2 .

[0033] Figure 3 It is a structural diagram of the engine thrust chamber.

[0034] Figure 4 This is the front view of the engine thrust chamber.

[0035] Figure 5 This is a left view of the engine thrust chamber.

[0036] Figure 6 yes Figure 4 Cross-section view at AA.

[0037] Figure 7 yes Figure 5 Cross-section at BB.

[0038] Figure 8 yes Figure 5 Cross-section view at CC.

[0039] Fig. 9 yes Figure 4 Cross-section at DD.

[0040] Fig.10 yes Figure 4 Cross-section at EE.

[0041] Fig.11 yes Figure 4 Cross-sectional view at FF.

[0042] Fig.12 yes Figure 6 Enlarged view of the structure at G in the middle.

[0043] Fig.13 yes Figure 8 Enlarged view of the structure at H in the middle.

[0044] As shown in the figure: 1. Pinhole injector, 101. Pinhole inner cylinder, 1011. Liquid oxygen path curved hole, 1012. Pinhole head regeneration cooling channel rib, 1013. Liquid oxygen radial injection hole, 1014. Pinhole head regeneration cooling channel, 102. Head guide plate, 1021. Central intercepting hole, 103. Pinhole liquid oxygen channel, 104. Pinhole head guide cone, 105. Pinhole outer cylinder, 106. Methane axial injection annular gap, 107. Slot, 108. Gear, 2. Methane first liquid collecting chamber, 201. Methane first liquid collecting chamber entering regeneration cooling channel hole, 3. Thrust chamber, 301. expansion section, 302. convergence section, 303. cylindrical section, 4. methane second liquid collecting chamber, 401. methane second liquid collecting channel, 402. methane second liquid collecting chamber rib, 5. torch igniter, 501. igniter combustion chamber, 502. spark plug, 503. gas oxygen inlet, 504. methane inlet, 505. methane liquid collecting chamber, 506. igniter flame channel, 507. methane near-wall centrifugal injection hole, 6. regeneration cooling jacket, 601. guide rib, 602. guide channel, 7. head sleeve, 8. liquid oxygen main line inlet, 9. methane main line inlet. DETAILED DESCRIPTION

[0045] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inside”, “outside”, “vertical” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The following is a further detailed description of a pintle injector and an engine thrust chamber of the present invention in conjunction with the accompanying drawings.

[0049] Combined with Figure 1-13 The specific implementation process of the pintle injector and engine thrust chamber of the present invention is as follows:

[0050] Example 1: Pintle Injector

[0051] A pintle injector, comprising a pintle inner cylinder 101 and a head guide plate 102; the pintle inner cylinder 101 is surrounded by a plurality of circular liquid oxygen path curved holes 1011 connecting the inner and outer spaces of the pintle inner cylinder 101, for introducing liquid oxygen into the pintle inner cylinder 101; the inner space of the pintle inner cylinder 101 is a pintle liquid oxygen flow channel 103 for the flow of liquid oxygen; the lower end of the pintle inner cylinder 101 is provided with a pintle head regenerative cooling flow channel rib 1012 surrounding its side wall, and adjacent pintle head regenerative cooling flow channel ribs 1012 The gaps between them form liquid oxygen radial injection holes 1013 on the wall of the needle plug inner tube 101 for radial injection of liquid oxygen. At the same time, these gaps form a needle plug head regeneration cooling channel 1014 at the bottom of the needle plug inner tube 101 for cooling. The head guide plate 102 is fixed on the top of the needle plug head regeneration cooling channel rib 1012 and gradually extends and rises from the outer wall of the needle plug inner tube 101 to the middle, playing a guiding role. The center of the head guide plate 102 is provided with a central intercepting hole 1021 running through the top and bottom for adjusting the liquid oxygen flow rate.

[0052] Furthermore, the bottom of the needle plug inner tube 101 protrudes downward to form an outwardly convex arc bottom surface, and a needle plug head guide cone 104 corresponding to the central intercepting hole 1021 is provided in the center of the arc bottom surface for further guiding the flow of liquid oxygen.

[0053] Furthermore, the needle plug head regeneration cooling channel rib 1012 extends from the outer wall of the needle plug inner tube 101 to the inner center and the lower end of the needle plug head regeneration cooling channel rib 1012 is fixed on the arc bottom surface, thereby enhancing the structural strength of the needle plug inner tube 101.

[0054] Example 2: Engine thrust chamber

[0055] An engine thrust chamber comprises a pintle injector 1, a first methane liquid collecting chamber 2, a thrust chamber 3, a second methane liquid collecting chamber 4, a torch-type igniter 5 and a regenerative cooling jacket 6; the pintle injector 1 adopts the pintle injector in Example 1;

[0056] The pintle injector 1 is fixed to the top of the thrust chamber 3 through the head sleeve 7 and the lower end extends to the inside of the thrust chamber 3, and is used to inject liquid oxygen and methane into the thrust chamber 3; the torch igniter 5 is fixed to the top of the thrust chamber 3 and the ignition end extends to the inside of the thrust chamber 3, and is used to ignite the fuel; the first methane collecting chamber 2 surrounds the lower end of the thrust chamber 3 and is provided with a methane main pipeline inlet 9, which is used to store and transport methane; the second methane collecting chamber 4 surrounds the top of the thrust chamber 3, and is used to further store and transport methane; the regenerative cooling jacket 6 is arranged inside the side wall of the thrust chamber 3, and is used to cool the thrust chamber 3.

[0057] Furthermore, the torch-type igniter 5 comprises an igniter combustion chamber 501, a spark plug 502, an oxygen inlet 503, a methane inlet 504, a methane liquid collecting chamber 505 and an igniter flame channel 506; the spark plug 502 is fixed to the upper part of the igniter combustion chamber 501 and the ignition end extends to the inside thereof, and is used to generate electric sparks to ignite the fuel; the oxygen inlet 503 is arranged at the top of the igniter combustion chamber 501, and is used to provide oxygen; the methane inlet 504 is arranged at the top of the igniter combustion chamber 501, and is used to provide oxygen; The side wall of chamber 501 extends downward to connect with methane collecting chamber 505, which is used to provide methane; the methane collecting chamber 505 is arranged around the lower end of igniter combustion chamber 501, and the inner wall of methane collecting chamber 505 is provided with methane near-wall centrifugal injection hole 507 connected with igniter combustion chamber 501, which is used to inject methane into igniter combustion chamber 501; igniter flame tongue channel 506 is arranged at the lower end of igniter combustion chamber 501 and connected with thrust chamber 3, which is used to introduce the ignited flame into thrust chamber 3.

[0058] Furthermore, a downwardly extending needle plug outer cylinder 105 is provided at the top center of the thrust chamber 3, and the needle plug outer cylinder 105 wraps the needle plug inner cylinder 101 to play a protective and supporting role; the inner wall of the bottom of the second methane collecting chamber 4 extends toward the top center of the thrust chamber 3 and the end is bent downward to surround the needle plug outer cylinder 105, and a methane axial injection annular gap 106 is formed between the needle plug outer cylinder 105 and the inner wall of the bottom of the second methane collecting chamber 4 for axial injection of methane.

[0059] Furthermore, the end of the needle plug head regeneration cooling channel rib 1012 extends to the outside of the needle plug inner tube 101, and a slot 107 is formed between two adjacent needle plug head regeneration cooling channel ribs 1012 on the outside, and a latch tooth 108 is provided at the lower end of the needle plug outer tube 105. The latch tooth 108 is inserted into the slot 107 to connect and fix the needle plug inner tube 101 and the needle plug outer tube 105, thereby enhancing the stability of the structure.

[0060] Furthermore, the thrust chamber 3 includes an expansion section 301, a convergent section 302 and a cylindrical section 303 which are smoothly connected from bottom to top. The expansion section 301 is wide at the bottom and narrow at the top, and the convergent section 302 is wide at the top and narrow at the bottom and its lower end is connected to the expansion section 301. A throat is formed at the connection between the two, which is the narrowest section of the thrust chamber 3. The lower end of the cylindrical end is connected to the top of the convergent section 302, thereby optimizing the flow field structure of the thrust chamber 3.

[0061] Furthermore, the regenerative cooling jacket 6 includes a plurality of guide ribs 601 extending from bottom to top along the thrust chamber 3 , and guide channels 602 are formed between adjacent guide ribs 601 for the flow of the cooling liquid.

[0062] Furthermore, a methane second liquid collecting chamber rib 402 smoothly connected to the top of the guide rib 601 is provided in the methane second liquid collecting chamber 4, and the methane second liquid collecting channel 401 is located between two adjacent methane second liquid collecting chamber ribs 402, thereby optimizing the flow path of methane.

[0063] Production requirements for engine thrust chamber:

[0064] The thrust chamber 3 and the regenerative cooling jacket 6 are integrally formed by additive manufacturing technology, and then post-processed by abrasive flow and other methods, and then the pintle and the flare igniter wall are printed in parts to ensure that the accuracy and friction coefficient meet the standards. Then, welding, quick-release clamps, or threads, flanges, etc. can be used for connection and assembly. In addition to the main supply pipeline of liquid oxygen and methane, higher pressure storage tanks for gaseous oxygen and gaseous methane should be added for testing the flare igniter.

[0065] The working process of the engine thrust chamber is as follows:

[0066] The high-pressure methane pumped out from the methane pump enters the methane first collecting chamber 2 through the methane inlet 504, and then enters the regeneration cooling flow channel hole 201 from the methane first collecting chamber 2 to the regeneration cooling jacket 6, and then exchanges heat with the high-temperature combustion gas in the thrust chamber 3 along the expansion section 301, the convergence section 302, and the cylindrical end in sequence to protect the inner wall of the thrust chamber 3, and then enters the methane second collecting chamber 4 to be collected, and finally is ejected axially along the methane axial injection annular gap 106.

[0067] At the same time, high-pressure cryogenic liquid oxygen is pumped into the liquid oxygen main line inlet 8, and enters the pintle oxygen delivery channel in the pintle injector 1 through the liquid oxygen line curved hole 1011. Part of the liquid oxygen enters the pintle head regeneration cooling channel through the central interception hole 1021 to cool the pintle head, and then mixes with the remaining liquid oxygen in front of the liquid oxygen radial injection hole 1013, and is radially injected through the liquid oxygen radial injection hole 1013. Finally, it collides with methane in the cylindrical section 303 and the convergent section 302 of the thrust chamber 3 to form a liquid fan.

[0068] Ignition principle of torch igniter:

[0069] Under the oxygen inlet 503, a local high oxygen-fuel mixture ratio is formed in the igniter combustion chamber 501 near the spark plug 502, and after being fully mixed with the methane gas film ejected through the methane inlet 504, the methane collecting chamber 505, and the methane near-wall centrifugal injection hole 507, a relatively low-temperature rich fuel gas is formed to reach the combustion chamber through the igniter flame channel 506, which can also play a role in protecting the metal wall.

[0070] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A pintle injector, characterized in that: It comprises a pintle inner cylinder (101) and a head guide plate (102); the upper part of the pintle inner cylinder (101) is surrounded by a plurality of liquid oxygen path curved holes (1011) connecting the inner and outer spaces of the pintle inner cylinder (101); the inner space of the pintle inner cylinder (101) is a pintle liquid oxygen flow channel (103); The lower end of the needle plug inner tube (101) is provided with a needle plug head regeneration cooling channel rib (1012) surrounding its side wall, the gaps between adjacent needle plug head regeneration cooling channel ribs (1012) form liquid oxygen radial injection holes (1013) on the wall of the needle plug inner tube (101), and the gaps between adjacent needle plug head regeneration cooling channel ribs (1012) form a needle plug head regeneration cooling channel (1014) at the bottom of the needle plug inner tube (101); The head guide plate (102) is fixed on the top of the needle plug head regeneration cooling channel rib (1012) and gradually extends and rises from the outer wall of the needle plug inner tube (101) toward the middle. The center of the head guide plate (102) is provided with a central intercepting hole (1021) running through the top and bottom.

2. A pintle injector according to claim 1, characterized in that: The bottom of the needle plug inner cylinder (101) protrudes downward to form an outwardly convex arc bottom surface, and a needle plug head flow guide cone (104) corresponding to the central intercepting hole (1021) is provided at the center of the arc bottom surface.

3. A pintle injector according to claim 2, characterized in that: The needle plug head regeneration cooling channel rib (1012) extends from the outer wall of the needle plug inner tube (101) toward the inner center, and the lower end of the needle plug head regeneration cooling channel rib (1012) is fixed on the arc-shaped bottom surface.

4. An engine thrust chamber, characterized in that: It comprises a pintle injector (1), a first methane liquid collecting chamber (2), a thrust chamber (3), a second methane liquid collecting chamber (4), a torch-type igniter (5) and a regenerative cooling jacket (6); The pintle injector (1) is a pintle injector as claimed in any one of claims 1 to 3; The pintle injector (1) is fixed to the top of the thrust chamber (3) through a head sleeve (7) and the lower end thereof extends into the interior of the thrust chamber (3); a liquid oxygen main pipe inlet (8) is provided on one side of the pintle injector (1) and passes through the head sleeve (7) to connect to an external oxygen supply device; the torch-type igniter (5) is fixed to the top of the thrust chamber (3) and the ignition end thereof extends into the interior of the thrust chamber (3); The first methane liquid collecting chamber (2) surrounds the lower end of the thrust chamber (3) and is provided with a methane main pipeline inlet (9); the inner wall of the first methane liquid collecting chamber (2) is provided with a methane first liquid collecting chamber entry regeneration cooling flow channel hole (201) connected to the regeneration cooling jacket (6); The second methane liquid collecting chamber (4) surrounds the top of the thrust chamber (3) for a circle, and a second methane liquid collecting channel (401) communicating with the regeneration cooling jacket (6) is provided inside the second methane liquid collecting chamber (4); The regenerative cooling jacket (6) is arranged inside the side wall of the thrust chamber (3) and extends radially along the thrust chamber (3) to communicate with the first methane liquid collecting chamber and the second methane liquid collecting chamber.

5. An engine thrust chamber according to claim 4, characterized in that: The torch-type igniter (5) comprises an igniter combustion chamber (501), a spark plug (502), an oxygen inlet (503), a methane inlet (504), a methane liquid collecting chamber (505) and an igniter flame channel (506); The spark plug (502) is fixed on the upper part of the igniter combustion chamber (501) and the ignition end extends into the interior thereof; the gas oxygen inlet (503) is arranged at the top of the igniter combustion chamber (501); the methane inlet (504) is arranged on the side wall of the igniter combustion chamber (501) and extends downward to communicate with the methane liquid collecting chamber (505); the methane liquid collecting chamber (505) is arranged around the lower end of the igniter combustion chamber (501); the inner wall of the methane liquid collecting chamber (505) is provided with a methane near-wall centrifugal injection hole (507) that is connected to the igniter combustion chamber (501); and the igniter flame tongue channel (506) is arranged at the lower end of the igniter combustion chamber (501) and is connected to the thrust chamber (3).

6. An engine thrust chamber according to claim 5, characterized in that: A pintle outer cylinder (105) extending downward is provided at the top center of the thrust chamber (3), and the pintle outer cylinder (105) wraps around the pintle inner cylinder (101); the inner wall at the bottom of the second methane liquid collecting chamber (4) extends toward the top center of the thrust chamber (3) and the end is bent downward to surround the pintle outer cylinder (105), and a methane axial injection annular gap (106) is formed between the pintle outer cylinder (105) and the inner wall at the bottom of the second methane liquid collecting chamber (4).

7. An engine thrust chamber according to claim 6, characterized in that: The end of the needle plug head regeneration cooling channel rib (1012) extends to the outside of the needle plug inner tube (101), and a clamping groove (107) is formed between two adjacent needle plug head regeneration cooling channel ribs (1012) located outside. The lower end of the needle plug outer tube (105) is provided with a clamping tooth (108), and the clamping tooth (108) is inserted into the clamping groove (107) to connect and fix the needle plug inner tube (101) and the needle plug outer tube (105).

8. An engine thrust chamber according to claim 7, characterized in that: The thrust chamber (3) comprises an expansion section (301), a convergent section (302) and a cylindrical section (303) which are smoothly connected from bottom to top, the expansion section (301) is wide at the bottom and narrow at the top, the convergent section (302) is wide at the top and narrow at the bottom and its lower end is connected to the expansion section (301), a throat is formed at the connection between the two, and the lower end of the cylindrical end is connected to the top of the convergent section (302).

9. An engine thrust chamber according to claim 8, characterized in that: The regenerative cooling jacket (6) comprises a plurality of guide ribs (601) extending from bottom to top along the thrust chamber (3), and guide channels (602) are formed between adjacent guide ribs (601).

10. An engine thrust chamber according to claim 9, characterized in that: The methane second liquid collecting chamber (4) is provided with a methane second liquid collecting chamber rib (402) smoothly connected to the top of the guide rib (601), and the methane second liquid collecting channel (401) is located between two adjacent methane second liquid collecting chamber ribs (402).

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