脉冲爆震发动机热力循环性能分析

分析了混合气体中燃烧产生的爆震波的传播机理,建立了爆震波传播过程中参数的基本关系。在不同进气增压比条件下,对爆震波的特性参数进行了计算,得出了爆震波前后气流参数的变化关系;并计算了爆震燃烧循环过程的热效率和爆震燃烧不可逆过程中熵增随爆震波前马赫数的变化规律。最后将爆震燃烧循环与布莱顿循环、甘福利循环进行比较,结果表明：爆震燃烧循环具有更高的有效循环功和循环热效率。

The Analysis of Pulse Detonation Engine Thermodynamic Cycle Performance

The propagation mechanism of detonation wave procreant in mixed gas is analyzed. The basic relation between the parameters of the detonation wave in propagation process is established. At the different pressure ratios, the detonation wave characteristic parameters are calculated, the backwards and forwards mach numbers of the detonation wave are obtained. The calculation method of thermal efficiency and entropy production with detonating combustion is deduced. At the different pressure ratios, the variety rule of thermal efficiency and entropy production are calculated. Finally, the detonation cycle is compared with Brayton cycle and Humphrey cycle, the results show that the detonation cycle is higher than the Brayton cycle and the Humphrey cycle in cycle thermal efficiency.