Effects of nose bluntness on entropy-layer stabilities over cones and wedges
Effects of nose bluntness on entropy-layer stabilities over cones and wedges
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DOI：
10.1007/s10409-022-22176-x
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发表时间：
2022-09
影响因子：
3.5
通讯作者：
Bingbing Wan;Jianqiang Chen;Guohua Tu;Xinghao Xiang;Xianxu Yuan;Maochang Duan
中科院分区：
文献类型：
--
作者：
Bingbing Wan;Jianqiang Chen;Guohua Tu;Xinghao Xiang;Xianxu Yuan;Maochang Duan
采用线性稳定性理论和数值模拟相结合的方法，研究了头部钝化对高超声速钝锥和楔形绕流中的熵层稳定性的影响。钝锥的熵层不稳定性比钝锥的强。由于熵层较厚，随着钝化程度的增加，其不稳定模频率减小。较大的钝化有效地扩大了下游不稳定模的区域，为熵层扰动提供了更多的机会来迫使边界层转变的触发。数值模拟表明，熵层模式可以激发边界层的第一模式。
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 entropy-layer 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.