关键词: 液体推进剂火箭发动机;高压补燃火箭发动机;液氧-液氢发动机;可靠性

Abstract: The characteristics of modern large liquid rocket engine are summarized and analyzed in this paper.The results show that it is essential to use the high-energy non-toxic fuel (such as liquid oxygen and kerosene or liquid oxygen and liquid hydrogen) as propellant in the large liquid rocket engine.The specific impulse of engine can be increased obviously and the geometery and mass of engine can be decreased by adopting the high-pressure staged combustion feed system. The residual propellant in rocket tanks can be decreased by applying a propellant utilization system, and the payload of launch vehicle will increase. The pressure in rocket tanks and the pressure on the inlet of main pumps can be increased by using boost pumps, so as to ensure that the main pumps can work reliably without cavitation erosion.The high reliability, long life expectance and reusability are especially important for astronautical products.

Key words: Liquid propellant rocket engine;High pressure staged combusting rocket engine;LOX-hydrogen engine;Reliability