Numerical Study of Air Flow Induced by Shock Impact on an Array of Perforated Plates.
Numerical Study of Air Flow Induced by Shock Impact on an Array of Perforated Plates.
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穿孔板阵列冲击引起气流的数值研究
DOI：
10.3390/e23081051
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发表时间：
2021-08-16
期刊：
影响因子：
--
通讯作者：
Shi H
中科院分区：
文献类型：
--
作者：
Zhang L;Feng Z;Sun M;Jin H;Shi H
研究了平面入射激波在多孔板阵列中的传播特性和衰减特性。采用基于密度的耦合显式算法，结合三阶MUSCL格式和Roe平均通量差分分裂方法，数值求解了描述空气流动的Navier-Stokes方程和可实现的k-ε湍流模型方程。有效地捕捉和分析了动力波和环涡系统的演变。入射激波马赫数，穿孔板的孔隙率，和板数上的冲击波的传播和衰减的影响进行了研究，通过使用压力和熵为基础的衰减率。结果表明，引导激波的反射、衍射、透射、干涉行为以及尾随二次激波的叠加作用是导致引导激波强度经历衰减、局部增强、衰减、增强、衰减等复杂过程的主要原因。反射激波与透射激波的相互作用导致了环形涡和射流的产生，从而导致了激波的变形和局部强化。近定常射流的形成是由于多孔板之间的内部动力波系统产生了一个振荡腔。涡量扩散、涡核的合并和分裂耗散了波能。此外，随着冲击马赫数的增加，领先的透射冲击波衰减得更显着，而来自阵列第一板的反射冲击波衰减得不太显着。孔隙率的增加减弱了对超前冲击波的抑制作用，但增加了反射冲击波的衰减率。阵列中的第一穿孔板在冲击波的衰减中起主要作用。
This study is focused on the propagation behavior and attenuation characteristics of a planar incident shock wave when propagating through an array of perforated plates. Based on a density-based coupled explicit algorithm, combined with a third-order MUSCL scheme and the Roe averaged flux difference splitting method, the Navier–Stokes equations and the realizable k-ε turbulence model equations describing the air flow are numerically solved. The evolution of the dynamic wave and ring vortex systems is effectively captured and analyzed. The influence of incident shock Mach number, perforated-plate porosity, and plate number on the propagation and attenuation of the shock wave was studied by using pressure- and entropy-based attenuation rates. The results indicate that the reflection, diffraction, transmission, and interference behaviors of the leading shock wave and the superimposed effects due to the trailing secondary shock wave are the main reasons that cause the intensity of the leading shock wave to experience a complex process consisting of attenuation, local enhancement, attenuation, enhancement, and attenuation. The reflected shock interactions with transmitted shock induced ring vortices and jets lead to the deformation and local intensification of the shock wave. The formation of nearly steady jets following the array of perforated plates is attributed to the generation of an oscillation chamber for the inside dynamic wave system between two perforated plates. The vorticity diffusion, merging and splitting of vortex cores dissipate the wave energy. Furthermore, the leading transmitted shock wave attenuates more significantly whereas the reflected shock wave from the first plate of the array attenuates less significantly as the shock Mach number increases. The increase in the porosity weakens the suppression effects on the leading shock wave while increases the attenuation rate of the reflected shock wave. The first perforated plate in the array plays a major role in the attenuation of the shock wave.
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影响因子：
2
作者：
Britan, A;Karpov, AV;Shapiro, E
通讯作者：
Shapiro, E
影响因子：
2.2
作者：
Britan, A.;Igra, O.;Shapiro, H.
通讯作者：
Shapiro, H.
影响因子：
7.2
作者：
Bivol, G. Yu;Golovastov, S., V
通讯作者：
Golovastov, S., V
影响因子：
4.6
作者：
Kontis, K.;An, R.;Kounadis, D.
通讯作者：
Kounadis, D.
DOI：
10.1016/j.ijmultiphaseflow.2016.07.019
发表时间：
2017-03-01
影响因子：
3.8
作者：
Lv, Hua;Wang, Zhongqi;Li, Jianping
通讯作者：
Li, Jianping