一种可变内收缩比的进气道自起动数值仿真

Self-starting Numerical Simulation Test of Inlet with Variable Internal Contraction Ratio

设计一套变几何机构用于调节喉道面积,从而改变进气道内收缩比。在Ma 4.0的来流条件下,通过数值仿真开展二元进气道在不同内收缩比下的自起动过程研究,获得进气道在不同内收缩比下的流场特征、喉道性能参数和进气道流量系数。研究结果表明,进气道自起动极限内收缩比为1.79,进气道在自起动的过程中,分离包不断减小,溢流激波逐渐向唇口移动,出口流量系数逐渐变大。

A variable geometry mechanism was designed to adjust throat area to change internal contraction ratio of inlet.The self-starting process of two-dimensional inlet with different internal contraction ratio was studied by numerical simulation at Ma 4.0 inflow conditions,by which the flow field characteristies,static surface pressure along inlet flowpath and the mass-flow coefficient were gained.The results show the self-starting contraction ratio maximum is 1.79,during the starting process of inlet,the separation bubble keeps decreasing,the overflow shock gradually moves towards the cowl and the outlet mass-flow coefficient increases steadily.After the inlet is started,the static pressure peak in internal contraction section is greatly reduced compared to the unstarted state.