Extrusion cycle（pressure-fed cycle）YesLiquid rocket engineA form of power cycle.The propellant is squeezed by high-pressure gas and enters the combustion chamber.
Extrusion cycle（pressure-fed cycle）YesLiquid rocket engineA form of power cycle.The propellant is squeezed by high-pressure gas and enters the combustion chamber.
The advantage of extrusion cycle is to avoid the complicated structureturbine, pumps and delivery pipes.Because the use of extrusion cycle can greatly reduce the cost and complexity of the engine.The disadvantage is that the pressure generated is not high enough, soEngine efficiencyNot high.
The first liquid rocket in history was launched by an American rocket scientistRobert H. Goddard It was launched in 1926.German rocket expertsVon BraunThe research team ofthe Second World WarDeveloped duringV-2 rocketIt has greatly promoted the development of large liquid rocket engines.After World War II, the United States, the Soviet Union/Russia and many other countries developed a large number of liquid rocket engines.As one of the most mature rocket propulsion systems, liquid rocket engine has high performance and many unique advantages, and is widely used inCarrier rocket, spacecraft andMissile。Liquid rocket engines were also briefly used asaircraftPropulsion power.[1]
Gas generator cycle
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Gas generatorCycle（Gas-generator cycle）Also calledOpen cycle, YesBinary liquid propellant rocketOne of the power cycles of an engine.A small part of the propellant is burned in the gas generator to generate gas to drive the turbine pump of the engine.
Compared with similarStaged combustion cycle，Gas generatorCirculation has many advantages.The turbine of the gas cycle does not have to deal with the back pressure when it discharges exhaust gas into the combustion chamber, so the working efficiency of the turbine is higher, and the pressure supplied to the fuel is also greater, thus increasing the engine'sSpecific impulse。Another advantage is that the turbine life of the gas cycle is longer and more reliable.someReusable launch vehicleThis power cycle has great advantages.
The main disadvantage of this cycle is the loss of efficiency.Because a part of the fuel is used to drive the turbine, and the exhaust gas is discharged directly, it is not like a graded combustion cycle in terms of net efficiency.[1]
