空气节流对超燃冲压发动机燃烧室起动点火影响的数值研究

利用空气节流在流场中产生激波串,有效地辅助燃料实现起动点火.非定常Navier-Stokes方程数值模拟研究了空气节流对超燃冲压发动机燃烧室起动点火的影响,分析了起动点火时间段(0~1.0ms)内空气节流 对流场参数的影响.数值模拟结果表明:在燃烧室入口马赫数为2.0、静温为548.8K、静压为101555.9 Pa,乙烯燃料当量比为0.5,先锋氢辅助点火的条件下,距离发动机入口845mm处,节流流量为入口空气流量的30%,有效地实现了发动机的起动点火,无空气节流情况下的发动机点火效果不佳,火焰最终熄灭. 

Numerical study on air throttling influence of ignition transient on the scramjet combustor

A proper shock train generated by air throttling could facilitate ignition.The effects of air throttling on ignition transient were studied by solving unsteady Navier-Stokes equations, and the mechanism of air throttling for ignition was also analyzed during the ignition transient (0— 1.0ms ).Computational fluid dynamics results show that:under the inflow air conditions of Mach number 2.0,static temperature 548.8K,static pressure 101555.9Pa and the equivalence ratio 0.5,the pilot H₂ is used for ignition,the location of air throttling is 845mm from the combustor entrance,and the flux of air throttling is 30% mass flux of inflow air. Ignition is achieved by air throttling, and flame goes out without air throttling at last.