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Shock Bifurcation Phenomenon in the Reflected Shock/Boundary Layer Interaction

机译:反射冲击/边界层相互作用中的冲击分岔现象

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This primary objective of this paper is to study the unsteady characteristics in the reflected shock wave/boundary layer interaction in an end-wall shock tube by a numerical simulation. It is discovered that the shock bifurcation mainly consists of a leading bifurcated shock, a recirculation region and a tail shock. Especially the shape of the entire recirculation zone seems like a crooked earthworm and the vortices in the rear of recirculation region continuously drop off from the walls when the shock bifurcation moves forwards. By analyzing the flow turbulent properties in the bifurcation, the turbulent intensity in the stream-wise direction is dominant in both value and direction, and the distribution of Reynolds shear stress becomes obviously asymmetric, which indicates an underlying instability of the shock bifurcation.
机译:本文的这种主要目的是通过数值模拟研究端壁冲击管中反射冲击波/边界层相互作用的非稳态特性。发现震动分叉主要由主要的分叉冲击,再循环区域和尾部冲击组成。特别是整个再循环区域的形状似乎是弯曲的蚯蚓和再循环区域后部的涡流,当冲击分叉向前移动时,再循环区域的后部连续下降。通过分析分叉中的流动湍流性能,在值和方向上,流方向的湍流强度在两个值和方向上显着,并且雷诺剪切应力的分布变得明显不对称,这表明了冲击分叉的底层不稳定性。

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