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为研究两级脉冲爆震发动机的性能,以Brayton循环和理想爆震循环为基础,建立和分析了两级脉冲爆震发动机的理想热力循环,利用CEA软件计算了富油燃烧产物及其组分随当量比的变化。计算分析表明,两级脉冲爆震发动机理想循环的热效率和单位推力介于Brayton循环和理想爆震循环之间,且随第一级放热比增大而减小;为得到最多的氢气和一氧化碳,第一级富油燃烧当量比应在2.6～2.8;由于燃烧反应不能完全进行和离解反应的存在,使得第一级富油燃烧的放热量减少,循环热效率增加。
In order to study the performance of two-stage pulse detonation engine, based on Brayton cycle and ideal detonation cycle, the ideal thermodynamic cycle of two-stage pulse detonation engine was established and analyzed. The CEA software was used to calculate the rich combustion products and their components With the equivalence ratio changes. The calculation and analysis show that the thermal efficiency and unit thrust of the two-stage pulse detonation engine are between the Brayton cycle and the ideal detonation cycle and decrease with the increase of the first-stage heat release ratio. In order to get the most hydrogen and carbon monoxide , The first stage rich combustion equivalence ratio should be 2.6 ~ 2.8; because the combustion reaction can not be fully carried out and the dissociation reaction exists, making the first stage rich combustion less heat, cycle thermal efficiency increases.