关键词: 变几何形状喷气发运机;高超音速冲压喷气发动机;冲压推进;航天飞机主发动机;燃料;氢燃料

Abstract: The probability of using ramjet at high Mach number flight for the aerospace-plane was discussed and the ramjet characteristics using liquid hydrogen, methane and propane as fuel was calculated and analyzed in detail. The diamond-shaped ramjet operating zone, the engine characteristics and the matching relation among basic cross-sections etc were presented in the paper.The results show that the ramjet performance meets the demand of aerospace-plane on propulsion system in the range of Ma = 2-6 and H = 0-40km and not only liquid hydrogen, but also methane and propane may be used as fuel for the ramjet under certain conditions.

Key words: Variable geometry jet engine;Hypersonic ramjet;Jet propulsion;Space shuttle main engine;Fuel;Hydrogen fuel