关键词: 混合式发动机;液体空气;分离;液氧;液氮

Abstract: This paper investigates a new concept of combined cycle propulsion system for aerospace aircraft, i.e.the performance of SERJ combined cycle engine based LACE(liquid air cycle engine).The perfomance of the engine with liquefied nitrogen and oxygen separated from liquefied air at different flight altitude and Mach numbers is calculated, the conclusions can be obtained as follows.1) The application of LACE will significantly improve the specific impulse performance despite the occurence of thrust decrease.2) It can be seen from the computational results that there exists an optimal engine performance at certain flow rate of liquefied air.

Key words: Combined engine;Liquid air Separation;Liquid oxygen;Liquid nitrogen