Reflection of cylindrical converging shock wave over a plane wedge
Reflection of cylindrical converging shock wave over a plane wedge
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圆柱会聚冲击波在平面楔上的反射
DOI：
10.1063/1.4961069
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发表时间：
2016
影响因子：
4.6
通讯作者：
Lu Xiyun
中科院分区：
文献类型：
--
作者：
Zhang Fu;Si Ting;Zhai Zhigang;Luo Xisheng;Yang Jiming;Lu Xiyun
在将平面激波转化为圆柱激波的激波管中，对圆柱会聚激波在平面楔上的反射进行了实验和数值研究。当会聚激波沿着楔运动时，激波强度和入射角都发生了变化，这就为波的转捩提供了可能。结果表明，在不同的初始入射角下，楔形体上既有规则反射（RR），又有马赫反射（MR）。在适当的初始入射角下，观察到了波从直接马赫反射（DiMR）到逆马赫反射（InMR）再到过渡规则反射（TRR）的转变。剪切层中的不稳定性发展和近壁处强涡的形成是明显的，这不仅归因于两个剪切层的相互作用，而且归因于激波的碰撞和激波的会聚效应。由于激波汇聚后的流动不稳定性，导致了分离临界点的出现。
The cylindrical converging shock reflection over a plane wedge is investigated experimentally and numerically in a specially designed shock tube which converts a planar shock into a cylindrical one. When the converging shock is moving along the wedge, both the shock strength and the incident angle are changing, which provides the possibility for the wave transition. The results show that both regular reflection (RR) and Mach reflection (MR) are found on the wedge with different initial incident angles. The wave transitions from direct Mach reflection (DiMR) to inverse Mach reflection (InMR) and further to transitioned regular reflection (TRR) are observed with appropriate initial incident angles. The instability development in the shear layer and strong vortices formation near the wall are evident, which are ascribed not only to the interaction of two shear layers but also to the shock impact and the shock converging effect. Because of the flow unsteadiness after the converging shock, the detachment crite...