A 25 kN gas generator cycle hydrogen peroxide liquid rocket engine

Abstract

The present invention provides a 25,000-newton gas generator-circulated hydrogen peroxide liquid rocket engine, primarily addressing the thrust limitations of existing hydrogen peroxide liquid rocket engines. The present invention employs a method in which hydrogen peroxide in the hydrogen peroxide pipeline is pressurized by a hydrogen peroxide pump, a portion of which passes through a regenerative cooling channel and is ultimately delivered to the thrust chamber for combustion. The remaining portion enters the gas generator, undergoes catalytic decomposition, and drives the turbine. The kerosene in the kerosene pipeline is pressurized by a kerosene pump and directly delivered to the thrust chamber for combustion. The turbine, through its rotor, drives the hydrogen peroxide and kerosene pumps, delivering more hydrogen peroxide and kerosene to the gas generator and thrust chamber, further driving the turbine and increasing thrust, ultimately reaching a balanced operating point and forming a cycle. The thrust of an engine employing the present invention is at least doubled compared to existing technologies.

Description

Technical Field

[0001] The invention belongs to the field of pump-pressure liquid rocket engines, and mainly relates to a gas generator circulating hydrogen peroxide regeneration cooling engine. Background Art

[0002] Liquid rocket engines are a crucial foundation for spacecraft and the primary propulsion system for space travel. With modern aerospace technology increasingly prioritizing environmental protection, personnel health, economy, and convenience, hydrogen peroxide, a non-toxic, pollution-free, high-density specific impulse, and room-temperature storable green propellant, offers significant advantages in transportation and operational costs. Hydrogen peroxide can be used as a regenerative cooling medium to cool the combustion chamber and nozzle. The high-temperature combustion gas generated by its decomposition in the catalytic bed can directly autoignite with the fuel, offering high reliability.

[0003] Current research on hydrogen peroxide liquid rocket engines focuses primarily on relatively simple extrusion-based fuel supply solutions, resulting in thrust of only around 10 kilonewtons. This limited thrust makes hydrogen peroxide liquid rocket engines difficult to meet the needs of future green and economical aerospace technology development. Therefore, it is necessary to develop a hydrogen peroxide engine with a pump-based fuel supply system. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art and improve the thrust of a hydrogen peroxide liquid rocket engine, the present invention provides a 25 kilonewton gas generator cycle hydrogen peroxide liquid rocket engine.

[0005] A 25 kN gas generator cycle hydrogen peroxide liquid rocket engine includes a kerosene pipeline, a hydrogen peroxide pipeline, a gas path, a transmission assembly and a thrust chamber;

[0006] The thrust chamber includes a main combustion chamber 17, a Laval nozzle 20 and a kerosene injection panel 19; the main combustion chamber 17 and the Laval nozzle 20 are coaxially connected in sequence; the kerosene injection panel 19 is provided inside the main combustion chamber 17;

[0007] The transmission assembly includes a gas generator 9 and a turbopump; the turbopump includes a turbine 7, a hydrogen peroxide pump 5, a kerosene pump 6 and a rotor 29; the turbine 7 is connected to the hydrogen peroxide pump 5 and the kerosene pump 6 through the rotor 29;

[0008] The gas generator 9 is a cylinder with closed ends. A hydrogen peroxide interface is provided on the top surface of the gas generator 9. A gas generator head catalytic bed 8 is provided at the top of the cavity of the gas generator 9. The gas generator 9 and the gas generator head catalytic bed 8 are coaxially mounted. The hydrogen peroxide interface is connected to the outlet of the hydrogen peroxide pump 5. A gas connection port is provided on the bottom surface of the gas generator 9. The gas connection port is connected to the inlet of the turbine 7.

[0009] The hydrogen peroxide pipeline is pressurized by the hydrogen peroxide pump 5 and connected to the hydrogen peroxide interface and the top inlet of the main combustion chamber 17 respectively;

[0010] The kerosene pipeline is pressurized by the kerosene pump 6 and connected to the kerosene inlet of the kerosene injection panel 19;

[0011] The catalytic bed 8 at the head of the gas generator is a cylinder; a hydrogen peroxide injection panel 8-1 at the head of the catalytic bed is provided at one end of the catalytic bed 8; a gas injection hole 8-4 at the tail of the catalytic bed is provided at the other end of the catalytic bed 8 at the head of the gas generator; the hydrogen peroxide injection panel 8-1 at the head of the catalytic bed is disc-shaped; a plurality of long strip through holes are provided on the end surface of the hydrogen peroxide injector at the head of the catalytic bed; the long strip through holes are the inlets of the catalytic bed 8 at the head of the gas generator; the gas injection hole 8-4 at the tail of the catalytic bed is disc-shaped; the catalytic bed A plurality of circular through holes are provided on the end face of the tail gas nozzle 8-4; a catalyst medium 8-2 is provided in a cavity composed of the shell of the catalytic bed 8 at the head of the gas generator, the hydrogen peroxide injector panel 8-1 at the head of the catalytic bed and the gas nozzle 8-4 at the tail of the catalytic bed; a catalytic bed tail bracket 8-5 is fixedly provided on the end face of the gas nozzle 8-4 at the tail of the catalytic bed: the catalytic bed tail bracket 8-5 is annular; a plurality of support ears are provided radially on the outer wall surface of the catalytic bed tail bracket 8-5; the support ears are fixedly connected to the inner wall of the catalytic bed 8 at the head of the gas generator.

[0012] Furthermore, the thrust chamber includes a main combustion chamber header catalytic bed 16, which has the same structure as the gas generator header catalytic bed 8. The main combustion chamber 17 includes the main combustion chamber header catalytic bed 16 and a kerosene injection panel 19 coaxially arranged from top to bottom. The addition of the main combustion chamber header catalytic bed to the thrust chamber allows for higher combustion efficiency between the gaseous products decomposed in the catalytic bed and the liquid kerosene.

[0013] Furthermore, the kerosene injection panel 19 is a circular ring; a kerosene inlet 19-4 is provided on the end face of the kerosene injection panel 19; the kerosene inlet 19-4 is a countersunk hole; the kerosene injection panel 19 is provided with injection panel ribs 19-3 radially with the center of the circle as the center; the injection panel ribs 19-3 are long strips; a long strip cavity is provided inside the injection panel ribs 19-3; the kerosene injection panel 19 is provided with an injection ring with the center of the circle as the center; the radius of the injection ring is smaller than the inner ring of the kerosene injection panel 19 radius; an annular cavity is provided within the injection ring; a plurality of kerosene injection holes are provided on the end face of the injection ring; the kerosene injection holes are blind holes; the kerosene injection holes are connected to the annular cavity; a through hole is provided on the side wall of the kerosene inlet 19-4; the through hole is connected to the elongated cavity of the injection panel rib 19-3; an annular channel connecting hole is provided on the inner wall of the elongated cavity; the annular channel connecting hole is connected to the annular cavity of the injection ring; the number of injection rings is greater than two; the injection rings are spaced equally between each other. Increasing the number of injection rings can improve the atomization of the kerosene; the injection rings ensure more uniform kerosene distribution while ensuring the passage of hydrogen peroxide decomposition products, thereby improving combustion efficiency.

[0014] Furthermore, the catalyst medium is a silver-plated nickel mesh or a silver mesh. The silver mesh can achieve higher catalytic efficiency, and the silver-plated nickel mesh can reduce the cost of use.

[0015] Furthermore, the angle between the kerosene injection hole and the normal direction of the kerosene injection panel 19 is 45 degrees. The angle between the kerosene injection hole and the normal direction of the kerosene injection panel 19 improves the mutual impact mixing effect of kerosene and hydrogen peroxide decomposition gas.

[0016] Furthermore, the thrust chamber includes a cooling device comprising a main combustion chamber outer regenerative cooling channel. A main combustion chamber outer regenerative cooling channel 18 is provided on the outer walls of the main combustion chamber 17 and the Laval nozzle 20. The hydrogen peroxide pipeline, after being pressurized by the hydrogen peroxide pump 5, is connected to a hydrogen peroxide interface and a regenerative cooling channel inlet of the main combustion chamber outer regenerative cooling channel, respectively. The first regenerative cooling channel outlet of the main combustion chamber outer regenerative cooling channel is connected to the top inlet of the main combustion chamber 17. The use of the regenerative cooling device improves the engine's cooling capacity and enables reuse of the cooling device.

[0017] Furthermore, the regenerative cooling channel outside the main combustion chamber includes a second regenerative cooling channel outlet; the second regenerative cooling channel outlet and the first regenerative cooling channel outlet converge at the thrust chamber and connect to the top inlet of the main combustion chamber 17. The provision of the first and second regenerative cooling channel outlets improves flow uniformity, resulting in a more even distribution of liquid entering the catalytic bed, thereby improving the efficiency of catalytic decomposition.

[0018] Furthermore, the hydrogen peroxide pipeline is as follows: the hydrogen peroxide storage tank 1 is connected to the inlet of the hydrogen peroxide filling valve 3; the outlet of the hydrogen peroxide filling valve 3 is connected to the inlet of the hydrogen peroxide pump 5; the outlet of the hydrogen peroxide pump 5 is connected to the inlet of the first three-way pipe; one outlet of the first three-way pipe is connected to the inlet of the hydrogen peroxide main path throttling element 10; the other outlet of the first three-way pipe is connected to the inlet of the hydrogen peroxide secondary path throttling element 14; the outlet of the hydrogen peroxide main path throttling element 10 is connected to the inlet of the hydrogen peroxide main valve 11 The outlet of the hydrogen peroxide main valve 11 is connected to the inlet 18-1 of the regeneration cooling channel; the outlet of the hydrogen peroxide secondary throttling element 14 is connected to the inlet of the hydrogen peroxide secondary valve 15; the outlet of the hydrogen peroxide secondary valve 15 is connected to an inlet of the second three-way pipe; the second three-way pipe includes two inlets and one outlet; the outlet of the second three-way pipe is connected to the hydrogen peroxide interface of the gas generator 9; the other inlet of the second three-way pipe is connected to the outlet of the one-way valve 23; the gas connection port of the gas generator 9 is connected to the inlet of the turbine 7.

[0019] Furthermore, the kerosene pipeline is as follows: the kerosene storage tank 2 is connected to the inlet of the kerosene filling valve 4; the outlet of the kerosene filling valve 4 is connected to the inlet of the kerosene pump 6; the outlet of the kerosene pump 6 is connected to the inlet of the kerosene throttling element 12; the outlet of the kerosene throttling element 12 is connected to the inlet of the kerosene main valve 13; and the outlet of the kerosene main valve 13 is connected to the kerosene inlet 19-4 of the kerosene injection panel.

[0020] Furthermore, the gas circuit includes a starting gas circuit, a blow-off gas circuit and a control gas circuit;

[0021] The starting gas circuit includes a gas cylinder 21, a starting gas valve 22 and a one-way valve 23;

[0022] The several starting gas cylinders 21 are connected to the inlet of the starting gas valve 22; the outlet of the starting gas valve 22 is connected to the inlet of the one-way valve 23; the outlet of the one-way valve 23 is connected to the inlet of the catalytic bed 8 at the head of the gas generator;

[0023] The purge gas circuit includes a plurality of purge gas bottles 24, a purge gas pressure reducing valve 25 and a purge gas solenoid valve 26;

[0024] The plurality of purge gas cylinders 24 are all connected to the inlet of the purge gas pressure reducing valve 25; the outlet of the purge gas pressure reducing valve 25 is connected to the inlet of the purge gas solenoid valve 26; a third three-way pipe is provided at the outlet of the purge gas solenoid valve 26; the inlet of the third three-way pipe is connected to the outlet of the purge gas solenoid valve 26; one outlet of the third three-way pipe is connected to the kerosene inlet 19-4 of the kerosene injection panel; the other outlet of the third three-way pipe is connected to the inlet 18-1 of the regeneration cooling channel;

[0025] The control gas circuit includes a control gas cylinder group 27 and a control gas solenoid valve group 28; the control gas solenoid valve group 28 includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, and a sixth solenoid valve;

[0026] The control gas cylinder group 27 includes a main gas cylinder and several gas filling cylinders; the main gas cylinder is connected to each solenoid valve in the control gas solenoid valve group 28; the several gas filling cylinders are connected to the main gas cylinder; when the gas pressure of the main gas cylinder is insufficient, the gas filling cylinder replenishes the gas of the main gas cylinder;

[0027] The first solenoid valve is connected to the control end of the kerosene filling valve 4; the second solenoid valve is connected to the control end of the hydrogen peroxide filling valve 3; the third solenoid valve is connected to the control end of the starting gas valve 22; the fourth solenoid valve is connected to the control end of the hydrogen peroxide auxiliary valve 15; the fifth solenoid valve is connected to the control end of the kerosene main valve 13; and the sixth solenoid valve is connected to the control end of the hydrogen peroxide main valve 11.

[0028] Using gas cylinders for starting and controlling can achieve multiple starts of the engine.

[0029] The beneficial effects of the present invention are:

[0030] (1) The maximum thrust of the hydrogen peroxide engine designed by the present invention reaches 25 kilonewtons, which is at least double the thrust of the existing hydrogen peroxide engine;

[0031] (2) The hydrogen peroxide engine designed by the present invention adopts a coaxial turbine pump layout, which can maintain a higher pressure and a larger flow rate in the thrust chamber and ensure a stable mixing ratio;

[0032] (3) The hydrogen peroxide engine designed by the present invention can achieve self-ignition after catalytic decomposition of hydrogen peroxide, without the need for an additional ignition device, thus simplifying the engine system. In addition, the gaseous product after catalytic decomposition of hydrogen peroxide and kerosene undergo gas-liquid combustion, which has a higher combustion efficiency.

[0033] (4) The engine uses hydrogen peroxide to regenerate the cooling channel, which has strong cooling capacity and can be reused;

[0034] (5) The engine can be started multiple times through the starting gas cylinder; BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 1 is a schematic structural diagram of a 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to the present invention;

[0036] Figure 2 This is a system assembly diagram of a 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to the present invention;

[0037] Figure 3 This is a schematic diagram of the engine thrust chamber structure;

[0038] Figure 4 The integrated diagram and three-dimensional cross-sectional diagram of the thrust chamber; (a) is the three-dimensional integrated structure diagram of the thrust chamber, and (b) is the three-dimensional cross-sectional diagram of the thrust chamber;

[0039] Figure 5 This is a schematic diagram of the structure of the catalytic bed at the head of the gas generator;

[0040] Figure 6 1 is a schematic diagram of the structure of the kerosene injection panel; (a) is a front view of the kerosene injection panel; (b) is a cross-sectional view of the kerosene injection panel;

[0041] Figure 7 Schematic diagram of the regenerative cooling channel structure outside the main combustion chamber; (a) is a cross-sectional view of the cooling channel of the nozzle expansion section; (b) is a cross-sectional view of the cooling channel of the nozzle throat;

[0042] Figure 8 This is the engine starting timing diagram;

[0043] Figure 9 It is the engine dynamic performance change diagram;

[0044] Figure 10 is the engine flow change diagram;

[0045] 1: Hydrogen peroxide tank; 2: Kerosene tank; 3: Hydrogen peroxide filling valve; 4: Kerosene filling valve; 5: Hydrogen peroxide pump; 6: Kerosene pump; 7: Turbine; 8: Catalytic bed at the head of the gas generator; 9: Gas generator; 10: Hydrogen peroxide throttling element; 11: Hydrogen peroxide main valve; 12: Kerosene throttling element; 13: Kerosene main valve; 14: Hydrogen peroxide secondary throttling element; 15: Hydrogen peroxide secondary valve; 16: Catalytic bed at the head of the main combustion chamber 17: Main combustion chamber; 18: Regeneration cooling channel outside the main combustion chamber; 19: Kerosene injection panel; 20: Laval nozzle; 21: Starting gas cylinder; 22: Starting gas valve; 23: One-way valve; 24: Blow-off gas cylinder; 25: Blow-off gas pressure reducing valve; 26: Blow-off gas solenoid valve; 27: Control gas cylinder; 28: Control gas solenoid valve group; 29: Rotor; 30: Frame; 31-1: First transmission pipeline; 32-2: Second transmission pipeline;

[0046] 8-1: Hydrogen peroxide injection panel at the head of the catalytic bed; 8-2: Catalyst medium; 8-3: Catalytic bed shell; 8-4: Gas injection hole at the tail of the catalytic bed; 8-5: Catalytic bed tail bracket;

[0047] 19-1: kerosene nozzle, 19-2: gas guide groove, 19-3: injection panel rib; 19-4: kerosene inlet;

[0048] 18-1: Regenerative cooling channel inlet; 18-2: First regenerative cooling channel outlet; 18-3: Second regenerative cooling channel outlet; 18-4: Regenerative cooling channel outer wall; 18-5: Regenerative cooling channel inner wall; 18-6: Regenerative cooling channel wall ribs; 18-7: Regenerative cooling channel milling groove;

[0049] t -1 Time: open the hydrogen peroxide filling valve 3 and the kerosene filling valve 4; time t0: start the ignition program; time t1: open the starting gas valve 22; time t2: open the hydrogen peroxide main valve 11; time t3: open the kerosene main valve 13; time t4: open the hydrogen peroxide auxiliary valve 15; time t5: close the starting gas valve 22. DETAILED DESCRIPTION

[0050] A 25 kN gas generator cycle hydrogen peroxide liquid rocket engine includes a kerosene pipeline, a hydrogen peroxide pipeline, a gas path, a transmission assembly and a thrust chamber;

[0051] The thrust chamber includes a main combustion chamber head catalytic bed 16, a main combustion chamber 17, a main combustion chamber outer regenerative cooling channel 18, a Laval nozzle 20, and a kerosene injection panel 19; the main combustion chamber 17 and the Laval nozzle 20 are coaxially connected in sequence; the main combustion chamber head catalytic bed 16 and the kerosene injection panel 19 are coaxially arranged in sequence inside the main combustion chamber 17; the main combustion chamber outer regenerative cooling channel 18 is arranged on the outer wall of the main combustion chamber 17 and the Laval nozzle 20;

[0052] The transmission assembly includes a gas generator and a turbopump; the turbopump includes a turbine 7, a hydrogen peroxide pump 5, a kerosene pump 6 and a rotor 29; the turbine 7 is connected to the hydrogen peroxide pump and the kerosene pump through the rotor 29;

[0053] The gas generator 9 is a cylinder with closed ends. A hydrogen peroxide interface is provided on the top surface of the gas generator 9. A gas generator head catalytic bed 8 is provided at the top of the cavity of the gas generator 9. The gas generator 9 and the gas generator head catalytic bed 8 are coaxially mounted. The hydrogen peroxide interface is connected to the outlet of the hydrogen peroxide pump 5. A gas connection port is provided on the bottom surface of the gas generator 9. The gas connection port is connected to the inlet of the turbine 7.

[0054] The hydrogen peroxide pipeline is pressurized by the hydrogen peroxide pump 5 and is respectively connected to the hydrogen peroxide interface and the regenerative cooling channel inlet of the regenerative cooling channel outside the main combustion chamber; the first regenerative cooling channel outlet of the regenerative cooling channel outside the main combustion chamber is connected to the top inlet of the main combustion chamber 17;

[0055] The kerosene pipeline is pressurized by the kerosene pump 6 and connected to the kerosene inlet of the kerosene injection panel 19;

[0056] The hydrogen peroxide regeneration cooling liquid rocket engine has an oxidant of hydrogen peroxide, a fuel of kerosene, a coolant of hydrogen peroxide, and a starting gas, a purge gas, and a control gas of nitrogen or helium;

[0057] During startup, the starting gas first builds pressure in the gas generator and drives the turbine. The rotation of the turbine drives the hydrogen peroxide pump and kerosene pump to increase pressure. After the hydrogen peroxide in the hydrogen peroxide pipeline is pressurized by the hydrogen peroxide pump, a portion passes through the regeneration cooling channel and is eventually sent to the thrust chamber for combustion. The other portion enters the gas generator, undergoes catalytic decomposition and drives the turbine. After the kerosene in the kerosene pipeline is pressurized by the kerosene pump, it is directly sent to the thrust chamber for combustion. The turbine drives the hydrogen peroxide pump and kerosene pump to operate through the rotor, sending more hydrogen peroxide and kerosene into the gas generator and thrust chamber, further driving the turbine and increasing thrust, eventually reaching a balanced operating point, forming a cycle.

[0058] The hydrogen peroxide pipeline is as follows: the hydrogen peroxide storage tank 1 is connected to the inlet of the hydrogen peroxide filling valve 3; the outlet of the hydrogen peroxide filling valve 3 is connected to the inlet of the hydrogen peroxide pump 5; the outlet of the hydrogen peroxide pump 5 is connected to the inlet of the first three-way pipe; one outlet of the first three-way pipe is connected to the inlet of the hydrogen peroxide main path throttling element 10; the other outlet of the first three-way pipe is connected to the inlet of the hydrogen peroxide secondary path throttling element 14; the outlet of the hydrogen peroxide main path throttling element 10 is connected to the inlet of the hydrogen peroxide main valve 11; the outlet of the hydrogen peroxide main valve 11 is connected to the inlet 18-1 of the regeneration cooling channel The outlet of the hydrogen peroxide secondary throttling element 14 is connected to the inlet of the hydrogen peroxide secondary valve 15; the outlet of the hydrogen peroxide secondary valve 15 is connected to an inlet of a second tee; the second tee includes two inlets and one outlet; the outlet of the second tee is connected to the inlet of the catalytic bed 8 at the head of the gas generator; the other inlet of the second tee is connected to the outlet of the one-way valve 23; the outlet of the second tee is connected to the hydrogen peroxide interface of the gas generator 9; the other inlet of the second tee is connected to the outlet of the one-way valve 23; the gas connection port of the gas generator 9 is connected to the inlet of the turbine 7;

[0059] The kerosene pipeline is as follows: the kerosene tank 2 is connected to the inlet of the kerosene filling valve 4; the outlet of the kerosene filling valve 4 is connected to the inlet of the kerosene pump 6; the outlet of the kerosene pump 6 is connected to the inlet of the kerosene throttling element 12; the outlet of the kerosene throttling element 12 is connected to the inlet of the kerosene main valve 13; the outlet of the kerosene main valve 13 is connected to the kerosene inlet 19-4 of the kerosene injection panel; the hydrogen peroxide pump 5, kerosene pump 6 and turbine 7 are connected via the rotor 29;

[0060] When starting operation, the gas in the starting gas cylinder enters the catalytic bed 8 and turbine 7 of the gas generator head in sequence from the outlet of the one-way valve 23. The turbine 7 then drives the hydrogen peroxide pump 5 and kerosene pump 6 to rotate through the rotor. When the rotation reaches a stable state, hydrogen peroxide enters the catalytic bed 8 of the gas generator head from the outlet of the hydrogen peroxide auxiliary valve 15 to decompose, and finally enters the turbine 7. The turbine 7 drives the hydrogen peroxide pump 5 and kerosene pump 6 through the rotor.

[0061] The gas circuit includes a starting gas circuit, a blowing gas circuit and a control gas circuit;

[0062] The starting gas circuit includes a gas cylinder 21, a starting gas valve 22 and a one-way valve 23;

[0063] The several starting gas cylinders 21 are connected to the inlet of the starting gas valve 22; the outlet of the starting gas valve 22 is connected to the inlet of the one-way valve 23; the outlet of the one-way valve 23 is connected to the inlet of the catalytic bed 8 at the head of the gas generator;

[0064] The purge gas circuit includes a plurality of purge gas bottles 24, a purge gas pressure reducing valve 25 and a purge gas solenoid valve 26;

[0065] The plurality of purge gas cylinders 24 are all connected to the inlet of the purge gas pressure reducing valve 25; the outlet of the purge gas pressure reducing valve 25 is connected to the inlet of the purge gas solenoid valve 26; a third three-way pipe is provided at the outlet of the purge gas solenoid valve 26; the inlet of the third three-way pipe is connected to the outlet of the purge gas solenoid valve 26; one outlet of the third three-way pipe is connected to the kerosene inlet 19-4 of the kerosene injection panel; the other outlet of the third three-way pipe is connected to the inlet 18-1 of the regeneration cooling channel;

[0066] The control gas circuit includes a control gas cylinder group 27 and a control gas solenoid valve group 28; the control gas solenoid valve group 28 includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, and a sixth solenoid valve;

[0067] The control gas cylinder group 27 includes a main gas cylinder and several gas filling cylinders; the main gas cylinder is connected to each solenoid valve in the control gas solenoid valve group 28; the several gas filling cylinders are connected to the main gas cylinder; when the gas pressure of the main gas cylinder is insufficient, the gas filling cylinder replenishes the gas of the main gas cylinder;

[0068] The first solenoid valve is connected to the control end of the kerosene filling valve 4; the second solenoid valve is connected to the control end of the hydrogen peroxide filling valve 3; the third solenoid valve is connected to the control end of the starting gas valve 22; the fourth solenoid valve is connected to the control end of the hydrogen peroxide auxiliary valve 15; the fifth solenoid valve is connected to the control end of the kerosene main valve 13; and the sixth solenoid valve is connected to the control end of the hydrogen peroxide main valve 11.

[0069] The gas generator head catalytic bed 8 is a cylinder; one end of the gas generator head catalytic bed 8 is provided with a catalytic bed head hydrogen peroxide injection panel 8-1; the other end of the gas generator head catalytic bed 8 is provided with a catalytic bed tail gas injection hole 8-4;

[0070] The hydrogen peroxide injection panel 8-1 at the head of the catalytic bed is disc-shaped; a plurality of elongated through holes are provided on the end surface of the hydrogen peroxide injector at the head of the catalytic bed; the elongated through holes are the inlets of the catalytic bed 8 at the head of the gas generator; the gas injection hole 8-4 at the tail of the catalytic bed is disc-shaped; a plurality of circular through holes are provided on the end surface of the gas injection hole 8-4 at the tail of the catalytic bed; a catalyst medium 8-2 is provided in a cavity formed by the shell of the catalytic bed 8 at the head of the gas generator, the hydrogen peroxide injector panel 8-1 at the head of the catalytic bed, and the gas injection hole 8-4 at the tail of the catalytic bed; a catalytic bed tail bracket 8-5 is fixedly provided on the end surface of the gas injection hole 8-4 at the tail of the catalytic bed; the catalytic bed tail bracket 8-5 is in the shape of a circular ring; a plurality of lugs are provided on the outer wall surface of the catalytic bed tail bracket 8-5 in the radial direction; the lugs are fixedly connected to the inner wall of the catalytic bed 8 at the head of the gas generator;

[0071] A main combustion chamber head catalytic bed 16 is provided at the inlet of the main combustion chamber 17; the structure of the main combustion chamber head catalytic bed 16 is the same as that of the gas generator head catalytic bed 8; a kerosene injection panel 19 is provided at the outlet of the main combustion chamber head catalytic bed 16; the main combustion chamber outer side regeneration cooling channel 18 includes a regeneration cooling channel inlet 18-1, a first regeneration cooling channel outlet 18-2 and a second regeneration cooling channel outlet 18-3; the first regeneration cooling channel outlet 18-2 is connected to one end of the first transmission pipeline 31-1; the second regeneration cooling channel outlet 18-3 is connected to one end of the second transmission pipeline 31-2; the other ends of the first transmission pipeline 31-1 and the first transmission pipeline 31-2 are connected to the top inlet of the main combustion chamber 17 after being merged in the thrust chamber;

[0072] The kerosene injection panel 19 is a circular ring; a kerosene inlet 19-4 is provided on the end face of the kerosene injection panel 19; the kerosene inlet 19-4 is a countersunk hole; the kerosene injection panel 19 is provided with injection panel ribs 19-3 radially with the center of the circle as the center; the injection panel ribs 19-3 are long strips; a long strip cavity is provided inside the injection panel ribs 19-3; the kerosene injection panel 19 is provided with an injection ring with the center of the circle as the center; the radius of the injection ring is The kerosene injection panel 19 has a radius smaller than the inner ring; an annular cavity is provided inside the injection ring; a kerosene injection hole is provided on the end face of the injection ring; the kerosene injection hole is a blind hole; the kerosene injection hole is connected to the annular cavity; a through hole is provided on the side wall of the kerosene inlet 19-4; the through hole is connected to the elongated cavity of the injection panel rib 19-3; an annular channel connecting hole is provided on the inner wall of the elongated cavity; the annular channel connecting hole is connected to the annular cavity of the injection ring;

[0073] The number of the injection rings is greater than 2; intervals are set between the injection rings; and the intervals between the injection rings are equal.

[0074] The catalyst medium is a silver-plated nickel mesh or a silver mesh.

[0075] The present invention will be further described below with reference to the accompanying drawings and examples.

[0076] The engine's operating sequence includes filling, starting and shutting down.

[0077] Before starting the engine, first fill it, that is, open the hydrogen peroxide filling valve and kerosene filling valve to fill hydrogen peroxide and kerosene into the hydrogen peroxide main valve, kerosene main valve and hydrogen peroxide auxiliary valve respectively.

[0078] The startup process mainly includes 5 steps:

[0079] ①Open the starting gas valve and use nitrogen / helium to drive the turbine to pressurize the supply system;

[0080] ②Open the hydrogen peroxide main valve. After passing through the regeneration cooling channel outside the main combustion chamber, hydrogen peroxide is decomposed by the catalytic bed at the head of the main combustion chamber and enters the main combustion chamber to build pressure.

[0081] ③Open the kerosene main valve, and kerosene will enter the main combustion chamber through the kerosene injection panel and mix with the decomposition products of hydrogen peroxide to burn;

[0082] ④ When the pressure after the hydrogen peroxide pump is greater than the pressure in the combustion chamber of the gas generator, open the hydrogen peroxide auxiliary valve, and the hydrogen peroxide enters the catalytic bed at the head of the gas generator to decompose and produce fuel gas, build up pressure in the gas generator, and discharge it into the turbine to replace the starting nitrogen / helium to do work.

[0083] ⑤ Close the starting air valve and the engine enters a stable working state.

[0084] The shutdown process adopts a gradual degradation shutdown method. First, the kerosene main valve is closed to reduce the engine to a single-component working mode, and then the hydrogen peroxide main valve is closed to completely shut down the engine.

[0085] The simulation results are as follows Figures 8-10 As shown;

[0086] Figure 8 The starting sequence of the engine is set. -1 At time t0, the hydrogen peroxide filling valve 3 and the kerosene filling valve 4 are opened, so that hydrogen peroxide and kerosene are filled into the inlets of the hydrogen peroxide main valve 11, the hydrogen peroxide auxiliary valve 15, and the kerosene main valve 13 respectively; at time t0, the ignition program is issued and the starting gas valve 22 is opened at time t1. At this time, the starting gas passes through the starting gas valve 22, the one-way valve 23, the catalytic bed 8 of the gas generator head, and the gas generator 9 in sequence from the starting gas cylinder 21, and finally enters the turbine 7 and drives it to rotate; the turbine 7 drives the hydrogen peroxide pump 5 and the kerosene pump 6 through the rotor 29 to increase the pressure of the hydrogen peroxide pipeline and the kerosene pipeline respectively; at time t2, the hydrogen peroxide main valve 11 is opened, and hydrogen peroxide passes through the hydrogen peroxide main valve 11, the regeneration cooling channel 18, The catalytic bed 16 at the head of the main combustion chamber finally enters the main combustion chamber 17; at time t3, the kerosene main valve 13 is opened, and the kerosene passes through the kerosene main valve 13 and the kerosene injection panel 19 in sequence and finally enters the main combustion chamber 17; the hydrogen peroxide in the main combustion chamber 17 is mixed with the kerosene and burned, so that the thrust of the engine is gradually increased; at time t4, the hydrogen peroxide auxiliary valve 15 is opened, and due to the action of the one-way valve 23 at one end of the second three-way pipe, the hydrogen peroxide directly enters the catalytic bed 8 at the head of the gas generator and the gas generator 9, and finally enters the turbine 7 and replaces the starting gas to drive the turbine to rotate; at time t5, the starting gas valve 22 is closed. At this time, the hydrogen peroxide pipeline, kerosene pipeline, transmission assembly and thrust chamber can maintain self-circulation and are separated from the gas circuit.

[0087] Figure 9 The changes in the gas generator 9 pressure, the main combustion chamber 17 pressure, the turbine 7 speed, and the engine thrust are displayed. Figure 10The figure shows the flow rates of hydrogen peroxide, kerosene, and starting gas within the main combustion chamber 17 and gas generator 9. At time t1, after the starting gas valve 22 opens, starting gas rapidly fills the gas generator 9 and drives the turbine 7. At time t2, after the hydrogen peroxide main valve 11 opens, hydrogen peroxide enters the main combustion chamber 17 at 0.196 seconds, causing pressure to build in the main combustion chamber and the engine to generate thrust. At time t3, after the kerosene main valve 13 opens, kerosene enters the main combustion chamber 17 at 0.300 seconds, mixing with hydrogen peroxide and burning. The pressure in the main combustion chamber suddenly rises and further increases, increasing the engine thrust. At time t4, after the hydrogen peroxide auxiliary valve 15 opens, hydrogen peroxide enters the gas generator 9 at 0.504 seconds, replacing the starting gas and further building pressure in the gas generator. This further increases the turbine speed, gas generator pressure, main combustion chamber pressure, and engine thrust, ultimately reaching the rated value of 25 kN at the equilibrium point.

Claims

1. A 25 kN gas generator cycle hydrogen peroxide liquid rocket engine, characterized by: It includes kerosene pipelines, hydrogen peroxide pipelines, gas lines, transmission components and thrust chambers; The thrust chamber comprises a main combustion chamber (17), a Laval nozzle (20) and a kerosene injection panel (19); the main combustion chamber (17) and the Laval nozzle (20) are coaxially connected in sequence; the kerosene injection panel (19) is arranged inside the main combustion chamber (17); The transmission assembly includes a gas generator (9) and a turbopump; the turbopump includes a turbine (7), a hydrogen peroxide pump (5), a kerosene pump (6) and a rotor (29); the turbine (7) is connected to the hydrogen peroxide pump (5) and the kerosene pump (6) via the rotor (29); The gas generator (9) is a cylinder with closed ends; a hydrogen peroxide interface is provided on the top surface of the gas generator (9); a gas generator head catalytic bed (8) is provided on the top of the gas generator (9) cavity; the gas generator (9) and the gas generator head catalytic bed (8) are coaxially installed; the hydrogen peroxide interface is connected to the outlet of the hydrogen peroxide pump (5); a gas connection port is provided on the bottom surface of the gas generator (9); the gas connection port is connected to the inlet of the turbine (7); The hydrogen peroxide pipeline is pressurized by a hydrogen peroxide pump (5) and is connected to the hydrogen peroxide interface and the top inlet of the main combustion chamber (17) respectively; The kerosene pipeline is pressurized by a kerosene pump (6) and connected to the kerosene inlet of the kerosene injection panel (19); The catalytic bed (8) at the head of the gas generator is a cylinder; a hydrogen peroxide injection panel (8-1) at the head of the gas generator is provided at one end of the catalytic bed (8); a gas injection hole (8-4) at the tail of the catalytic bed is provided at the other end of the catalytic bed (8); the hydrogen peroxide injection panel (8-1) at the head of the catalytic bed is disc-shaped; a plurality of long strip through holes are provided on the end surface of the hydrogen peroxide injector at the head of the catalytic bed; the long strip through holes are the inlets of the catalytic bed (8) at the head of the gas generator; the gas injection hole (8-4) at the tail of the catalytic bed is disc-shaped; the gas injection hole (8-4) at the tail of the catalytic bed is A plurality of circular through holes are provided on the end surface of the gas injection hole (8-4); a catalyst medium (8-2) is provided in a cavity formed by a shell of the catalytic bed (8) at the head of the gas generator, a hydrogen peroxide injection panel (8-1) at the head of the catalytic bed, and the gas injection hole (8-4) at the tail of the catalytic bed; a catalytic bed tail bracket (8-5) is fixedly provided on the end surface of the gas injection hole (8-4) at the tail of the catalytic bed; the catalytic bed tail bracket (8-5) is in a circular ring shape; a plurality of lugs are provided on the outer wall surface of the catalytic bed tail bracket (8-5) in a radial direction; and the lugs are fixedly connected to the inner wall of the catalytic bed (8) at the head of the gas generator.

2. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 1, characterized in that: The thrust chamber includes a main combustion chamber head catalytic bed (16); the structure of the main combustion chamber head catalytic bed (16) is the same as the structure of the gas generator head catalytic bed (8); the main combustion chamber head catalytic bed (16) and the kerosene injection panel (19) are coaxially arranged in sequence from top to bottom inside the main combustion chamber (17).

3. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 1, characterized in that: The kerosene injection panel (19) is a circular ring; a kerosene inlet (19-4) is provided on the end surface of the kerosene injection panel (19); the kerosene inlet (19-4) is a countersunk hole; the kerosene injection panel (19) is provided with injection panel ribs (19-3) along the radial direction with the center of the circle as the center; the injection panel ribs (19-3) are long strips; a long strip cavity is provided inside the injection panel ribs (19-3); the kerosene injection panel (19) is provided with an injection ring with the center of the circle as the center; the radius of the injection ring is smaller than the radius of the kerosene injection panel (19). The invention relates to a method for manufacturing a kerosene injection ring having an inner ring radius; an annular cavity is arranged inside the injection ring; a plurality of kerosene injection holes (19-1) are arranged on the end face of the injection ring; the kerosene injection holes are blind holes; the kerosene injection holes are connected to the annular cavity; a through hole is arranged on the side wall of the kerosene inlet (19-4); the through hole is connected to the elongated cavity of the injection panel rib (19-3); an annular channel connecting hole is arranged on the inner wall of the elongated cavity; the annular channel connecting hole is connected to the annular cavity of the injection ring; the number of the injection rings is greater than 2; intervals are arranged between the injection rings and the intervals between the injection rings are equal.

4. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 3, characterized in that: The angle between the kerosene injection hole and the normal direction of the kerosene injection panel (19) is 45 degrees.

5. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 1, characterized in that: The catalyst medium is a silver-plated nickel mesh or a silver mesh.

6. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 1, characterized in that: The thrust chamber includes a cooling device; the cooling device is a main combustion chamber outer regeneration cooling channel; the main combustion chamber outer regeneration cooling channel (18) is provided on the outer wall surface of the main combustion chamber (17) and the Laval nozzle (20); the hydrogen peroxide pipeline is pressurized by a hydrogen peroxide pump (5) and is respectively connected to the hydrogen peroxide interface and the regeneration cooling channel inlet of the main combustion chamber outer regeneration cooling channel; the first regeneration cooling channel outlet of the main combustion chamber outer regeneration cooling channel is connected to the top inlet of the main combustion chamber (17).

7. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 6, characterized in that: The regenerative cooling channel outside the main combustion chamber includes a second regenerative cooling channel outlet; the second regenerative cooling channel outlet and the first regenerative cooling channel outlet are connected to the top inlet of the main combustion chamber (17) after being merged in the thrust chamber.

8. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 3, characterized in that: The kerosene pipeline is as follows: the kerosene tank (2) is connected to the inlet of the kerosene filling valve (4); the outlet of the kerosene filling valve (4) is connected to the inlet of the kerosene pump (6); the outlet of the kerosene pump (6) is connected to the inlet of the kerosene throttling element (12); the outlet of the kerosene throttling element (12) is connected to the inlet of the kerosene main valve (13); and the outlet of the kerosene main valve (13) is connected to the kerosene inlet (19-4) of the kerosene injection panel.

9. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 1, characterized in that: The hydrogen peroxide pipeline is as follows: the hydrogen peroxide storage tank (1) is connected to the inlet of the hydrogen peroxide filling valve (3); the outlet of the hydrogen peroxide filling valve (3) is connected to the inlet of the hydrogen peroxide pump (5); the outlet of the hydrogen peroxide pump (5) is connected to the inlet of the first three-way pipe; one outlet of the first three-way pipe is connected to the inlet of the hydrogen peroxide main path throttling element (10); the other outlet of the first three-way pipe is connected to the inlet of the hydrogen peroxide secondary path throttling element (14); the outlet of the hydrogen peroxide main path throttling element (10) is connected to the inlet of the hydrogen peroxide main valve (11); The outlet of the hydrogen peroxide main valve (11) is connected to the inlet (18-1) of the regeneration cooling channel; the outlet of the hydrogen peroxide secondary throttling element (14) is connected to the inlet of the hydrogen peroxide secondary valve (15); the outlet of the hydrogen peroxide secondary valve (15) is connected to an inlet of a second three-way pipe; the second three-way pipe includes two inlets and one outlet; the outlet of the second three-way pipe is connected to the hydrogen peroxide interface of the gas generator (9); the other inlet of the second three-way pipe is connected to the outlet of the one-way valve (23); and the gas connection port of the gas generator (9) is connected to the inlet of the turbine (7).

10. The 25 kN gas generator cycle hydrogen peroxide liquid rocket engine according to claim 7, characterized in that: The gas circuit includes a starting gas circuit, a blowing gas circuit and a control gas circuit; The starting gas circuit includes a gas cylinder (21), a starting gas valve (22) and a one-way valve (23); the starting gas cylinders (21) are all connected to the inlet of the starting gas valve (22); the outlet of the starting gas valve (22) is connected to the inlet of the one-way valve (23); the outlet of the one-way valve (23) is connected to the inlet of the catalytic bed (8) at the head of the gas generator; The purge gas circuit includes a plurality of purge gas bottles (24), a purge gas pressure reducing valve (25) and a purge gas solenoid valve (26); the plurality of purge gas bottles (24) are all connected to the inlet of the purge gas pressure reducing valve (25); the outlet of the purge gas pressure reducing valve (25) is connected to the inlet of the purge gas solenoid valve (26); a third three-way pipe is provided at the outlet of the purge gas solenoid valve (26); the inlet of the third three-way pipe is connected to the outlet of the purge gas solenoid valve (26); one outlet of the third three-way pipe is connected to the kerosene inlet (19-4) of the kerosene injection panel; and the other outlet of the third three-way pipe is connected to the inlet (18-1) of the regeneration cooling channel; The control gas circuit includes a control gas cylinder group (27) and a control gas solenoid valve group (28); the control gas solenoid valve group (28) includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, and a sixth solenoid valve; the control gas cylinder group (27) includes a main gas cylinder and a plurality of gas charging cylinders; the main gas cylinder is respectively connected to each solenoid valve in the control gas solenoid valve group (28); the plurality of gas charging cylinders are respectively connected to the main gas cylinder; when the gas pressure in the main gas cylinder is insufficient, the gas charging cylinder replenishes the gas in the main gas cylinder; the first solenoid valve is connected to the control end of the kerosene filling valve (4); the second solenoid valve is connected to the control end of the hydrogen peroxide filling valve (3); the third solenoid valve is connected to the control end of the starting gas valve (22); the fourth solenoid valve is connected to the control end of the hydrogen peroxide auxiliary valve (15); the fifth solenoid valve is connected to the control end of the kerosene main valve (13); and the sixth solenoid valve is connected to the control end of the hydrogen peroxide main valve (11).

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