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采用氢氧单步化学反应模型,对以当量比为1.0的氢气空气预混气为反应物的旋转爆震发动机(RDE)进行了数值模拟,系统研究了燃烧室轴向长度对RDE性能的影响.通过详细分析燃烧室进出口气体状态参数,揭示了燃烧室轴向长度对发动机影响的内在机理.研究结果表明:燃烧室轴向长度过短时,爆震波的形成不够充分;在发动机推力中,动量推力占主要部分;在计算的燃烧室轴向长度范围内,发动机的比冲为5 410~5 566s,燃烧室轴向长度对发动机比冲的影响较小.
The single-step reaction model of hydrogen and oxygen was used to simulate the rotary detonation engine (RDE) with hydrogen air pre-mixed gas as reactant at the equivalent ratio of 1.0. The influence of axial length of combustion chamber on the performance of RDE was systematically studied The detailed analysis of the gas inlet and outlet parameters in the combustion chamber reveals the inherent mechanism of the influence of the axial length of the combustion chamber on the engine.The results show that the formation of the detonation wave is not sufficient when the axial length of the combustion chamber is too short, , And the momentum thrust is the main part. In the range of the axial length of the combustion chamber, the specific impulse of the engine is 5 410-5 566 s, and the axial length of the combustion chamber has little influence on the specific impulse of the engine.