关键词: 射流预冷却涡轮发动机;射流预冷却;冷却剂/氧化剂组合;高超声速;发动机特性

Abstract: For studying the engine characteristics of SteamJet with coolants/oxidizers systematically, the mathematical models of the water injection pre-cooling device, the corrected method of physical property and the engine components characteristics computation, and the combustion chamber with oxidizers were set up. Based on the models mentioned above, the computational model of SteamJet with coolants/oxidizers on the basis of the two-spool mix-exhausted turbofan engine with afterburner was built, and the corresponding program was developed. The control law of maximum power of SteamJet was initially designed, and the engine characteristics of SteamJet with different coolants/oxidizers when following flight-trace were computed and analyzed, thus the major influencing factors for the selection of coolants/oxidizers ratio were gained, and the altitude and velocity characteristics of SteamJet with coolants/oxidizers were calculated and analyzed. It was shown from the computational results that the SteamJet with coolants/oxidizers has better combustion stability and thrust characteristics, and can meet the need of hypersonic flight.

Key words: SteamJet; Precompressor cooling; Coolants/Oxidizers; Hypersonic; Engine characteristics