采用离散相模型对带并联凹腔结构的煤油超燃燃烧室进行数值模拟,分析了正对并联凹腔和交错并联凹腔对支板直接喷入煤油的燃烧室燃烧性能的影响。结果表明,并联凹腔会使煤油进一步向展向扩展,混合效率得到明显提高;正对并联凹腔能极大提升煤油的穿透深度,拓宽煤油的亚声速燃烧范围,而对燃烧条件下总压损失系数影响不大;交错并联布置的凹腔可进一步增加煤油的混合效果,热力喉道的位置后移,亚声速燃烧范围扩大,燃烧效率提高。

Numerical simulation with discrete phase model was made on supersonic combustor with a parallel cavity structure. The effect of the cavity paralleled in different ways on kerosene mixture characteristics was analyzed. The results show that the mixture efficiency of kerosene increasing obviously with parallel cavity. The ordinary parallel cavity extends equivalent ratio range, enlarging the scope of subsonic combustion. Compared with ordinary parallel cavity, the cavity dislocated in parallel contributes to the mixture of fuel and air with higher mixture efficiency, putting the thermal throat backward the combustor, further enlarging subsonic combustion zone, increasing combustion efficiency.