Injector, rocket engine and rocket ignition method

Abstract

The present invention provides an injector, a rocket engine and a rocket ignition method, which relate to the technical field of rocket engines. The injector provided by the present invention comprises: a cover body, a base, a catalytic device and an injector head; the cover body is connected to the base, and a first liquid accumulation chamber and a catalytic chamber are formed between the cover body and the base, the first liquid accumulation chamber is separated from the catalytic chamber, and the catalytic device is installed in the catalytic chamber; the injector head is connected to the base, and a second liquid accumulation chamber is formed between the injector head and the base, and the first liquid accumulation chamber is fluidically connected to the second liquid accumulation chamber; the base is provided with an injection hole, and the catalytic chamber is fluidically connected to the injection hole; an injection gap is formed between the injector head and the base, and the second liquid accumulation chamber is fluidically connected to the injection gap. The injector, rocket engine and rocket ignition method provided by the present invention have both liquid injection and catalytic bed injection functions, and not only have the excellent performance of reducing the pressure drop during the injection process, but also have the technical advantage of being able to ignite multiple times.

Description

Technical Field

[0001] The present invention relates to the technical field of rocket engines, and in particular to an injector, a rocket engine and a rocket ignition method. Background Art

[0002] The injection speed of traditional liquid injectors is fast, and the residence time in the combustion chamber is short, which is not conducive to combustion. More importantly, liquid injectors cannot achieve multiple ignitions. This is because the liquid oxidant will not ignite when it comes into direct contact with the solid fuel. It needs to be ignited with the help of an igniter, so multiple ignitions cannot be achieved. Traditional gas injection requires the oxidant to pass through a catalytic bed, which is a porous medium. The process of the oxidant fluid passing through the catalytic bed will produce a huge pressure drop. This pressure drop will cause a large pressure loss in the delivery system. Summary of the invention

[0003] The object of the present invention is to provide an injector, a rocket engine and a rocket ignition method, which have both liquid injection and catalytic bed injection functions, have the excellent performance of reducing the pressure drop during the injection process, and also have the technical advantage of multiple ignitions.

[0004] In a first aspect, the present invention provides an injector, comprising: a cover, a base, a catalytic device and an injector head;

[0005] The cover is connected to the base, and a first liquid accumulation chamber and a catalytic chamber are formed between the cover and the base, the first liquid accumulation chamber is separated from the catalytic chamber, and the catalytic device is installed in the catalytic chamber;

[0006] The injection head is connected to the base, and a second liquid accumulation chamber is formed between the injection head and the base, and the first liquid accumulation chamber is in fluid communication with the second liquid accumulation chamber;

[0007] The base is provided with an injection hole, and the catalytic chamber is in fluid communication with the injection hole;

[0008] An injection gap is formed between the injection head and the base, and the second liquid accumulation chamber is in fluid communication with the injection gap.

[0009] In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the jet direction of the injection slit intersects with the jet direction of the injection hole.

[0010] In combination with the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the cover body is provided with a first ring plate and a second ring plate, and the second ring plate surrounds the first ring plate;

[0011] The base is provided with a boss portion, and the first ring plate is butted against the boss portion to enclose and form the first liquid accumulation cavity;

[0012] A first annular cavity is formed between the second ring plate and the boss portion, a notch is provided on the first ring plate, and the first liquid accumulation cavity is connected with the first annular cavity through the notch;

[0013] The base is provided with an inclined hole, and the first annular cavity is communicated with the second liquid accumulation cavity through the inclined hole.

[0014] In combination with the second possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the base is provided with a third ring plate, the third ring plate surrounds the second ring plate, and a second annular cavity is formed between the third ring plate and the second ring plate;

[0015] The third ring plate is used to separate the catalytic chamber and the second annular chamber. A swirl hole is provided on the third ring plate. The catalytic chamber is connected to the second annular chamber through the swirl hole. The second annular chamber is connected to the injection hole.

[0016] In combination with the third possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein, from one end connected to the catalytic chamber to one end connected to the second annular chamber, the swirl hole is inclined along the circumferential direction of the second annular chamber.

[0017] In combination with the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein the injection hole is inclined along the circumferential direction of the injection head.

[0018] In combination with the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the end surface of the base facing the catalytic chamber is provided with ribs.

[0019] In combination with the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein an elastic member is connected between the base and the injection head, and the elastic member has a tendency to make the injection head tend to fit the base so as to shrink the injection gap.

[0020] In a second aspect, the rocket engine provided by the present invention includes the injector recorded in the first aspect.

[0021] In a third aspect, the rocket ignition method provided by the present invention uses the above-mentioned injector and comprises the following steps:

[0022] The oxidant is introduced into the catalytic chamber, and the high-temperature gas ejected from the injection hole is contacted with the fuel and reacts to form ignition combustion;

[0023] The flow rate of the oxidant introduced into the catalytic chamber is reduced, and the oxidant is introduced into the first liquid accumulation chamber.

[0024] The embodiments of the present invention bring about the following beneficial effects: the cover body is connected to the base, and a first liquid accumulation chamber and a catalytic chamber are formed between the cover body and the base, the first liquid accumulation chamber is separated from the catalytic chamber, the catalytic device is installed in the catalytic chamber, the injection head is connected to the base, and a second liquid accumulation chamber is formed between the injection head and the base, the first liquid accumulation chamber is fluidically connected to the second liquid accumulation chamber, the base is provided with an injection hole, the catalytic chamber is fluidically connected to the injection hole, an injection gap is formed between the injection head and the base, the second liquid accumulation chamber is fluidically connected to the injection gap, it has both liquid injection and catalytic bed injection functions, has the excellent performance of reducing the pressure drop during the injection process, and also has the technical advantage of being able to ignite multiple times.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A cross-sectional view of an injector provided by an embodiment of the present invention;

[0028] Figure 2 A cross-sectional view of a base of an injector provided in accordance with an embodiment of the present invention.

[0029] Icons: 001-cover; 011-first ring plate; 111-notch; 012-second ring plate; 101-first inlet; 002-base; 021-boss; 022-rib; 023-third ring plate; 231-swirl hole; 201-injection hole; 202-oblique hole; 203-second inlet; 204-bottom notch; 003-catalytic device; 004-injection head; 401-injection gap; 0 05-elastic part; 501-tension spring; 502-welding rod; 006-first sealing ring; 007-second sealing ring; 008-third sealing ring; 009-limiting part; 091-guide column; 092-first connecting part; 093-second connecting part; 010-partition; 100-first liquid accumulation chamber; 200-catalytic chamber; 300-second liquid accumulation chamber; 400-first annular chamber; 500-second annular chamber. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the base units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected 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.

[0033] like Figure 1 As shown, the injector provided by the embodiment of the present invention includes: a cover body 001, a base 002, a catalytic device 003 and an injection head 004; the cover body 001 is connected to the base 002, and a first liquid accumulation chamber 100 and a catalytic chamber 200 are formed between the cover body 001 and the base 002, the first liquid accumulation chamber 100 is separated from the catalytic chamber 200, and the catalytic device 003 is installed in the catalytic chamber 200; the injection head 004 is connected to the base 002, and a second liquid accumulation chamber 300 is formed between the injection head 004 and the base 002, and the first liquid accumulation chamber 100 is fluidically connected to the second liquid accumulation chamber 300; the base 002 is provided with an injection hole 201, and the catalytic chamber 200 is fluidically connected to the injection hole 201; an injection gap 401 is formed between the injection head 004 and the base 002, and the second liquid accumulation chamber 300 is fluidically connected to the injection gap 401.

[0034] Specifically, the injection flow of the main liquid oxidant accounts for about 80-90% of the total injection flow. The main process of liquid flow is: the liquid enters the first liquid accumulation chamber 100 through the first inlet 101 on the cover body 001, and the liquid flows from the first liquid accumulation chamber 100 into the second liquid accumulation chamber 300. Finally, the liquid in the second liquid accumulation chamber 300 is ejected through the injection gap 401. The liquid is accumulated in the second liquid accumulation chamber 300, so that the injection gap 401 can be filled with liquid, thereby ensuring the injection atomization effect. The secondary gas injection process is: one path is drawn from the oxidant in the delivery system as a secondary path, and the secondary oxidant flow accounts for 10% to 20% of the total flow. First, the secondary liquid enters the catalytic chamber 200 through the second inlet 203, and the liquid entering the catalytic chamber 200 passes through the catalytic device 003 evenly, and the oxidant is catalytically decomposed into high-temperature gas. Subsequently, the high-temperature fuel gas can flow and be discharged through the injection hole 201.

[0035] like Figure 1 and Figure 2 As shown, in the embodiment of the present invention, the jet direction of the injection slit 401 intersects with the jet direction of the injection hole 201 .

[0036] Specifically, the injection gap 401 extends in a ring shape, and the plurality of injection holes 201 are evenly distributed outside the injection gap 401. In an optional embodiment, the jet direction of the injection hole 201 is inclined and close to the injection gap 401, so that the jet direction of the injection gap 401 intersects with the jet direction of the injection hole 201. In the present embodiment, a bottom slot 204 is provided on the side of the base 002 facing away from the cover body 001, and the injection head 004 is installed in the bottom slot 204. The end face of the bottom slot 204 opposite to the injection head 004 is provided with a conical surface, and the radial dimension of the conical surface increases from the end close to the cover body 001 to the end facing away from the cover body 001. An annular injection gap 401 is formed between the inner wall of the bottom slot 204 and the injection head 004. The atomized liquid sprayed through the injection gap 401 can be guided along the conical surface, so that the jet direction of the injection gap 401 and the jet direction of the injection hole 201 are intersected, thereby generating a mutual impact effect, better crushing the droplets, reducing the droplet diameter, and improving the injection effect.

[0037] like Figure 1 and Figure 2As shown, the cover body 001 is provided with a first ring plate 011 and a second ring plate 012, and the second ring plate 012 surrounds the first ring plate 011; the base 002 is provided with a boss portion 021, and the first ring plate 011 is connected to the boss portion 021 to enclose and form a first liquid accumulation chamber 100; a first annular chamber 400 is formed between the second ring plate 012 and the boss portion 021, and a notch 111 is provided on the first ring plate 011, and the first liquid accumulation chamber 100 is connected to the first annular chamber 400 through the notch 111; the base 002 is provided with an inclined hole 202, and the first annular chamber 400 is connected to the second liquid accumulation chamber 300 through the inclined hole 202.

[0038] Specifically, the notches 111 can be evenly spaced and distributed in multiple numbers around the first liquid accumulation chamber 100. In this embodiment, the notches 111 can be configured as 16, and the opening shape of the notches 111 can be configured as a square. The number of notches 111 can also be increased or decreased as needed, or the opening shape and caliber size of the notches 111 can be changed. Multiple inclined holes 202 can be arranged at intervals along the circumferential direction of the first annular chamber 400. The number of inclined holes 202 can be configured as 36, and the number of inclined holes 202 can be increased or decreased according to performance requirements. In addition, a first sealing ring 006 is installed between the cover body 001 and the base 002. The first sealing ring 006 is located on the outside of the catalytic chamber 200. The first sealing ring 006 ensures that the catalytic chamber 200 is isolated and sealed from the outside. A third sealing ring 008 is installed between the injection head 004 and the side wall of the bottom notch 204. The third sealing ring 008 ensures that the second liquid accumulation chamber 300 is isolated from the gas above the injection head 004. A second sealing ring 007 is installed between the boss portion 021 and the second ring plate 012. The second sealing ring 007 can prevent the liquid in the first annular cavity 400 and the high-temperature gas in the second annular cavity 500 from mixing inside the injector, that is, the second sealing ring 007 is isolated between the first annular cavity 400 and the second annular cavity 500.

[0039] Furthermore, from one end connected to the first annular cavity 400 to one end connected to the second liquid accumulation cavity 300, the inclined hole 202 is inclined in a direction away from the first liquid accumulation cavity 100, and during the process of liquid flowing from the first annular cavity 400 into the second liquid accumulation cavity 300, the liquid pressure drop is small.

[0040] In an optional embodiment, the inclined hole 202 may be inclined along the circumferential direction of the first liquid accumulation chamber 100 , thereby causing the liquid to flow along the circumferential direction in the second liquid accumulation chamber 300 .

[0041] Furthermore, the base 002 is provided with a third ring plate 023, and the third ring plate 023 surrounds the second ring plate 012, and a second annular cavity 500 is formed between the third ring plate 023 and the second ring plate 012; the third ring plate 023 separates the catalytic cavity 200 and the second annular cavity 500, and a swirl hole 231 is provided on the third ring plate 023, and the catalytic cavity 200 is connected with the second annular cavity 500 through the swirl hole 231, and the second annular cavity 500 is connected with the injection hole 201.

[0042] Specifically, the gas in the catalytic chamber 200 can enter the second annular chamber 500 through the multiple swirl holes 231. The multiple swirl holes 231 are evenly spaced along the circumference of the second annular chamber 500, thereby ensuring uniform air intake in the second annular chamber 500.

[0043] From one end connected to the catalytic chamber 200 to one end connected to the second annular chamber 500, the swirl holes 231 are inclined along the circumferential direction of the second annular chamber 500, thereby allowing the high-temperature gas entering the second annular chamber 500 to flow along the circumferential direction. In this embodiment, the first spiral injection is from the high-temperature gas decomposed by the catalytic bed to enter the second annular chamber 500 through a plurality of evenly distributed swirl holes 231, thereby extending the residence time of the high-temperature gas in the second annular chamber 500, and then the high-temperature gas transfers heat to the liquid in the first annular chamber 400 through the second ring plate 012, thereby achieving heating of the oxidant fluid in the first annular chamber 400.

[0044] Furthermore, the injection hole 201 is inclined along the circumferential direction of the injection head 004, thereby forming a second spiral injection. The second spiral injection is a tangential impact of the gas discharged from the injection hole 201 on the liquid oxidant sprayed from the injection gap 401, thereby better pulverizing the droplets and improving the atomization effect.

[0045] Furthermore, the end surface of the base 002 facing the catalytic chamber 200 is provided with ribs 022. In the engine, the side of the base 002 facing away from the cover 001 is provided with a combustion chamber, and the temperature in the combustion chamber is as high as 2000-3000K. The heat of the combustion chamber can be transferred to the oxidant in the catalytic chamber 200 through the base 002. In addition, a plurality of ribs 022 can be provided, and a fin-like structure is formed by a plurality of ribs 022 arranged at intervals, thereby increasing the heating area of ​​the oxidant in the catalytic chamber 200. The ribs 022 can be configured with a triangular cross section, and a tip of the triangle protrudes toward the inside of the catalytic chamber 200, thereby improving the heat transfer efficiency.

[0046] Furthermore, an elastic member 005 is connected between the base 002 and the injection head 004 , and the elastic member 005 has a tendency to make the injection head 004 tend to fit the base 002 so as to shrink the injection gap 401 . Among them, the elastic member 005 includes: a welding rod 502 and a tension spring 501, one end of the tension spring 501 is connected to the welding rod 502, and the other end of the tension spring 501 is connected to the injection head 004, and the welding rod 502 is connected to the base 002. A plurality of welding rods 502 are arranged at intervals along the circumferential direction of the tension spring 501. During installation, the plurality of welding rods 502 are respectively inserted into the holes on the base 002, and the welding rod 502 is pulled by a force measuring device, so that the welding rod 502 is displaced, thereby driving the tension spring 501 to stretch, and the displacement is fixed by the tension reading of the force measuring device, and the welding rod 502 at this position is fixed, and then the welding rod 502 is fixed to the base 002. In this way, the elastic member 005 can be installed more accurately, thereby ensuring the initial stretching length and initial tension of the elastic member 005. Under the elastic force of the elastic member 005, the conical surfaces opposite to the injection head 004 and the base 002 fit together, so that the injection gap 401 tends to close, and the injected liquid pushes the injection head 004, so that the injection gap 401 is formed between the injection head 004 and the base 002, thereby ensuring a constant pressure drop of the liquid injection.

[0047] A partition 010 is installed on the end face of the injection head 004 facing away from the base 002. The partition 010 can block the limit piece 009 on the injection head 004. In addition, the partition 010 is provided with a through hole, one end of which is used to communicate with the combustion chamber, and the other end of the through hole is connected to the gap area between the injection head 004 and the base 002, so as to balance the air pressure at both ends of the injection head 004, thereby allowing the injection head 004 to move smoothly along the guide column 091 relative to the base 002. The limiting member 009 includes: a guide column 091, a first connecting member 092 and a second connecting member 093, wherein the first connecting member 092 and the second connecting member 093 are respectively mounted on the guide column 091, the first connecting member 092 abuts against the base 002, the guide column 091 passes through the injection head 004 to guide the injection head 004, and the second connecting member 093 is located on the side of the injection head 004 away from the base 002, and the second connecting member 093 can limit the movement limit position of the injection head 004 away from the base 002. Among them, the first connecting member 092 and the second connecting member 093 can both be bolts or limiting clamps.

[0048] The rocket engine provided in the embodiment of the present invention includes the injector provided in the above-mentioned embodiment. In the embodiment of the present invention, the rocket engine has the technical effect of the injector, so it will not be repeated here.

[0049] like Figure 1 and Figure 2 As shown, the rocket ignition method provided in the embodiment of the present invention uses the injector provided in the above embodiment and includes the following steps:

[0050] The oxidant is introduced into the catalytic chamber 200, and the high-temperature gas ejected from the injection hole 201 is contacted with the fuel and reacts to form ignition combustion;

[0051] The flow rate of the oxidant introduced into the catalytic chamber 200 is reduced, and the oxidant is introduced into the first liquid accumulation chamber 100 .

[0052] Specifically, the ignition control process of this embodiment is as follows:

[0053] S01: Preparation before ignition. Fill the tank, ensure that the pipeline is filled and determine the status of each valve.

[0054] S02: Secondary operation. The secondary oxidant enters the catalytic chamber 200 through the second inlet 203 at a relatively large flow rate, passes through the catalytic bed, and generates high-temperature oxygen and water vapor. The high-temperature gas passes through the swirl hole 231, the second annular cavity 500 and the injection hole 201 in sequence and enters the combustion chamber. The high-temperature gas contacts the engine fuel, undergoes a chemical reaction, and ignites and burns.

[0055] S03: Main path operation. By monitoring the engine combustion chamber pressure and real-time thrust, after confirming that the engine ignition is working, reduce the secondary path oxidant flow rate to 10% of the total flow rate. The main path oxidant enters the first liquid accumulation chamber 100 through the first inlet 101. The main path oxidant passes through the notch 111, the first annular cavity 400, and the inclined hole 202 in sequence to enter the second liquid accumulation chamber 300. After the oxidant fills the second liquid accumulation chamber 300, it is intended to be sprayed into the combustion chamber through the circumferentially extending injection gap 401. The liquid oxidant to be sprayed into the combustion chamber encounters the high-temperature gas sprayed tangentially at the outlet position, and the two collide with each other, the liquid is broken, and stronger atomization occurs, and the atomized droplets enter the combustion chamber.

[0056] S04: The engine is shut down. First, the secondary oxidant is turned off, and then the main oxidant is turned off. This is because if the main oxidant is turned off first and then the secondary oxidant is turned off, it will bring risks. If the main oxidant is turned off first, the high-temperature gas of the secondary oxidant will continue to heat the main oxidant remaining in the gap of the main road. At this time, the main oxidant does not flow and cannot take away more heat. A large amount of high-temperature gas continues to heat the accumulated hydrogen peroxide, which will cause the hydrogen peroxide to decompose, thereby introducing risks.

[0057] S05: Engine purge. High-pressure nitrogen passes through the main and secondary routes at the same time. The purge gas will take away the residual hydrogen peroxide in the pipeline to prevent the accumulated hydrogen peroxide from decomposing in large quantities.

[0058] When igniting again, the above step S02 can be directly performed.

[0059] The injector, rocket engine and rocket ignition method have the following technical advantages:

[0060] 1. It can be ignited multiple times, combining the advantages of liquid injection and catalytic bed injection in solid-liquid engines. It has the excellent performance of low pressure drop during injection and retains the advantages of multiple ignitions.

[0061] 2. Low pressure drop and small energy loss in the transportation system. The main flow in the pipeline does not pass through the catalyst bed, so the pressure drop is small. Only part of the oxidation flow passes through the catalyst, so the pressure drop is large. Compared with the traditional solution where all oxidant flows pass through the catalyst bed, this solution has a low pressure drop and small energy loss in the transportation system.

[0062] 3. Good atomization effect. By converting the liquid oxidant into high-temperature gas through the catalytic bed, the hydrogen peroxide in the first annular cavity 400 can be heated on the one hand, and on the other hand, the gas injected from the injection hole 201 and the liquid injected from the injection gap 401 can be impacted with each other, thus achieving coaxial gas-liquid injection, and the atomization effect is better than that of single liquid injection.

[0063] 4. During the test, the injection pressure drop is fixed, the injection effect is stable, the injection pressure drop is independent of the combustion chamber pressure, and can resist combustion chamber pressure fluctuations.

[0064] 5. Before the tension spring 501 is fixed, multiple injectors can be processed before the test by setting the force measuring device and the initial stretching amount. By changing the initial stretching amount of the tension spring 501, the injection pressure drop can be actively set to obtain the injection effect under different pressure drops.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injector, characterized in that: include: A cover (001), a base (002), a catalytic device (003) and an injection head (004); The cover (001) is connected to the base (002), and a first liquid accumulation chamber (100) and a catalytic chamber (200) are formed between the cover (001) and the base (002), the first liquid accumulation chamber (100) is separated from the catalytic chamber (200), and the catalytic device (003) is installed in the catalytic chamber (200); The injection head (004) is connected to the base (002), and a second liquid accumulation chamber (300) is formed between the injection head (004) and the base (002), and the first liquid accumulation chamber (100) is fluidically connected to the second liquid accumulation chamber (300); The base (002) is provided with an injection hole (201), and the catalytic chamber (200) is in fluid communication with the injection hole (201); An injection gap (401) is formed between the injection head (004) and the base (002), and the second liquid accumulation chamber (300) is in fluid communication with the injection gap (401); The cover body (001) is provided with a first ring plate (011) and a second ring plate (012), and the second ring plate (012) surrounds the first ring plate (011); The base (002) is provided with a boss portion (021), and the first ring plate (011) is butted against the boss portion (021) to enclose and form the first liquid accumulation chamber (100); A first annular cavity (400) is formed between the second annular plate (012) and the boss portion (021); a notch (111) is provided on the first annular plate (011); and the first liquid accumulation cavity (100) is connected to the first annular cavity (400) through the notch (111); The base (002) is provided with an inclined hole (202), and the first annular cavity (400) and the second liquid accumulation cavity (300) are connected through the inclined hole (202).

2. The injector according to claim 1, characterized in that The jet direction of the injection slit (401) intersects with the jet direction of the injection hole (201).

3. The injector according to claim 1, characterized in that The base (002) is provided with a third ring plate (023), the third ring plate (023) surrounds the second ring plate (012), and a second annular cavity (500) is formed between the third ring plate (023) and the second ring plate (012); The third ring plate (023) separates the catalytic chamber (200) and the second annular chamber (500), and a swirl hole (231) is provided on the third ring plate (023); the catalytic chamber (200) and the second annular chamber (500) are connected via the swirl hole (231), and the second annular chamber (500) is connected to the injection hole (201).

4. The injector according to claim 3, characterized in that From one end connected to the catalytic chamber (200) to one end connected to the second annular chamber (500), the swirl hole (231) is inclined along the circumferential direction of the second annular chamber (500).

5. The injector according to claim 1, characterized in that The injection hole (201) is inclined along the circumferential direction of the injection head (004).

6. The injector according to claim 1, characterized in that The end surface of the base (002) facing the catalytic chamber (200) is provided with ribs (022).

7. The injector according to claim 1, characterized in that An elastic member (005) is connected between the base (002) and the injection head (004), and the elastic member (005) has a tendency to make the injection head (004) tend to fit the base (002) so as to shrink the injection gap (401).

8. A rocket engine, characterized in that: The rocket engine comprises the injector according to any one of claims 1-7.

9. A rocket ignition method, characterized in that: The rocket ignition method uses the injector according to any one of claims 1 to 7, and comprises the following steps: The oxidant is introduced into the catalytic chamber (200), and the gas ejected from the injection hole (201) is allowed to contact and react with the fuel to form ignition combustion; The flow rate of the oxidant introduced into the catalytic chamber (200) is reduced, and the oxidant is introduced into the first liquid accumulation chamber (100).

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