Experimental and numerical study of shock wave interaction with perforated plates
Experimental and numerical study of shock wave interaction with perforated plates
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DOI：
10.1115/1.1758264
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发表时间：
2004-05-01
影响因子：
2
通讯作者：
Shapiro, E
中科院分区：
文献类型：
--
作者：
Britan, A;Karpov, AV;Shapiro, E
激波经过筛板或穿孔板后的流动最初是高度不稳定和不均匀的。本文从实验和理论/数值上研究了入射激波与几种不同类型的具有相同孔隙度但不同几何形状的屏障相互作用所产生的流型和波型。结果表明，在所调查的所有情况下，屏障下游的水流可分为两个不同的区域。由于紧靠在屏障后面的流动是高度不稳定的，而另一个位于屏障更下游的前部的流动是不均匀的，流动接近于稳定和均匀的状态。透射激波所经历的大部分衰减发生在流动极不稳定的区域。在求解激波穿过障壁后形成的流动时，忽略能量损失（即假设流体为完美流体，因此采用欧拉方程而不是Navier-Stokes方程），会导致非定常流动区的非物理结果。
The flow developed behind shock wave transmitted through a screen or a perforated plat is initially highly unsteady and nonuniform. It contains multiple shock reflections and interactions with vortices shed from the open spaces of the barrier The present paper studies experimentally and theoretically/numerically the flow and wave pattern resulted from the interaction Of an incident shock wave with a few different types of barriers, all having the same porosity but different geometries. It is shown that in all investigated cases the flow downstream of the barrier call be divided into two different zones. Due immediately behind the barrier where the flow is highly unsteady, and nonuniform in the other placed further downstream front the barrier the flow approaches a steady and uniform state. It is also shown that most of the attenuation experienced by the transmitted shock wave occurs in the zone where the flow is highly unsteady. When solving the flow developed behind the shock wave transmitted through the barrier while ignoring energy losses (i.e., assuming the fluid to be a perfect fluid and therefore employing the Euler equation instead of the Navier-Stokes equation) leads to non-physical results in the unsteady flow zone.