亚声飞行Ma数变化对脉冲爆震发动机性能影响

采用经验数据和数值计算相结合的方法研究亚声飞行Ma数变化对带气动阀的脉冲爆震发动机(Pulsedetonation engine,简称PDE)的性能影响。分别计算了飞行Ma数在0.52,0.71,0.82和0.93时对PDE工作频率、推力和油耗的影响。计算表明当飞行Ma数从0.82增加到0.93时,频率上升11.1%,推力上升25.0%,油耗下降6.2%;而Ma数从0.82减小到0.52时,频率下降31.0%,推力下降43.6%,油耗增加14.8%。因此飞行Ma数变化对预估飞行器在亚声阶段的加速性能有较大的参考价值。

Thermodynamic Performance of Pulse Detonation Engine with Changing Ma Number at Subsonic Flight

The performance of pulse detonation engine(PDE) is studied by using the method of combining experimental data and numerical computation. The influence of the working frequency,thrust and Specific fuel consumption(SFC) of PDE is calculated,as the Ma=0.52,0.71,0.82 and 0.93.The computation shows that the frequency increases by 11.1%;the thrust increases by 25.0%;and SFC falls by 6.2%,when the Ma number varies from 0.82 to 0.93.But the frequency drops by 31.0%;the thrust falls by 43.6%;and SFC increases by 14.8%,when the Ma number varies from 0.82 to 0.52.Thus,the changing Mach number is valuable for estimating the aircraft performance of speed-up at subsonic flight.