关键词: 脉冲爆震发动机;涡轮;组合;内外涵;性能

Abstract: The pressure ahead of detonation chamber in bypass is utilized to drive a fore turbine combined with pulsed detonation engine. A performance model is established to study the components characteristics and propulsive performance of the engine. The calculation results show that a quasi-stable inlet condition of total temperature and total pressure can be realized in this combined PDE. The increase in the area ratio of side hole to detonation tube section(drive area ratio) leads to the increase in flow flux inpouring the turbine. But the total turbine inlet temperature,total turbine inlet pressure and blow-down ratio of turbine decrease as increasing drive area ratio. Contrast with conventional engine based on constant - pressure combustion, the turbine inlet temperature of combined PDE with drive area ratio 1 is 80K lower than the former under the same pressure ratio and fuel-gas ratio. In another words, increase in drive area ratio may improve the performance of combined PDE. Pressure ratio can be changed by changing in drive area ratio to adapt varied flight Mach number, which induces the enlargement of operating range. 

Key words: Pulse detonation engine; Turbine; Hybrid; Bypass；Performance