摘要
本文利用稳定性理论和数值模拟方法研究头部钝度对高超声速钝锥与钝楔的熵层稳定性的影响.结果表明钝楔的熵层不稳定性相比钝锥更强.随着钝度增加,熵层厚度逐渐变厚,熵层模态的不稳定性频率逐渐减小,但其不稳定区间不断向下游拓宽,表明熵层中的扰动将有更多机会影响边界层的转捩过程.数值模拟实现了熵层模态激发边界层第一模态的过程.
The effects of nose bluntness on the entropy-layer stabilities in hypersonic flows over blunt cones and wedges are investigated by using linear stability theory and numerical simulation.The entropy-layer instabilities of blunt wedges are stronger than those of blunt cones.The unstable mode frequency of the entropy layer decreases with increasing bluntness due to a thicker entropy layer.Larger bluntness is effective at widening the region of the unstable mode downstream,creating more opportunities for entropylayer disturbances to force the triggering of boundary layer transition.Numerical simulations show that the entropy-layer mode can excite the first mode of the boundary layer.
作者
万兵兵
陈坚强
涂国华
向星皓
袁先旭
段茂昌
Bingbing Wan;Jianqiang Chen;Guohua Tu;Xinghao Xiang;Xianxu Yuan;Maochang Duan(State Key Laboratory of Aerodynamics,Mianyang 621000,China)
基金
supported by the National Natural Science Foundation of China(Grant Nos.12002353 and 92052301)
the National Numerical Windtunnel Project,and the innovation foundation from the State Key Laboratory of Aerodynamics(Grant No.JBKYC190107)。
