The Numerical method was utilized to simulate the working performance of the PDRE .Specific impulse of the PDRE with different nozzles (convergent, divergent, convergent-divergent) was studied.It was found that PDRE with convergent nozzle could obtain the highest specific impulse , which was 17.20% higher than the cases without any nozzle.Ambient pressure was reduced to simulate the operation of the PDRE under vacuum condition . The results and their analysis show preliminarily that the low ambient pressure is beneficial for improving the work -ing performance of PDRE, and 0.5atm is considered to be the optimum ambient pressure .% 采用数值模拟和实验的方法研究不同喷管形式（收敛型，扩张型和收敛扩张型）和环境压力对火箭式脉冲爆震发动机（PDRE）比冲的影响。数值模拟中采用有限速率化学反应模型，通过二阶迎风格式差分逼近二维欧拉方程，数值计算结果表明收敛型喷管对比冲的增益最大（17.20％），环境压力为0.5 atm 时比冲最大。不同喷管形式的实验中利用推力传感器测量得到比冲，结果同样表明收敛喷管的比冲增益最大（18.67％），且数值模拟和实验的结果基本吻合。分别采用理想性能模型和热力循环模型研究环境压力对 PDRE 比冲的影响。结果表明，在环境压力小于1 atm 时，两种模型的分析和数值模拟均呈现不同的结果，因此低压环境下发动机的比冲影响规律有待进一步实验验证。
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