Impacts of grid turbulence on the side projection of planar shock waves
Impacts of grid turbulence on the side projection of planar shock waves
复制标题
网格湍流对平面激波侧投影的影响
DOI：
10.1007/s00193-021-01000-2
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发表时间：
2021
期刊：
影响因子：
2.2
通讯作者：
and A. Sasoh
中科院分区：
文献类型：
--
作者：
G.Fukushima;S. Ogawa;J. Wei;Y. Nakamura;and A. Sasoh
在本研究中，利用反驱动激波管研究了侧面投影平面激波在网格湍流中的传播特性。在激波-湍流相互作用的可视化位置，激波马赫数的范围是，湍流马赫数的代表值是。激波与网格湍流的相互作用长度约为湍流整体长度尺度的1~2倍。对于涉及最强湍流的相互作用，最弱的平面激波发生了很大的变形，在投影的阴影图和纹影图像上无法检测到。冲击波投影图像中的密度在灰度上的变化是多维减弱和扩展的。冲击波的这种不可检测的轮廓可能表明冲击波局部失去了不连续的性质变化轮廓。冲击波并没有在投影图像中显示出不可检测的轮廓。在这些情况下，冲击波的投影厚度随着相互作用长度的增加而增加。随着湍流马赫数的增大、激波马赫数的减小，投影厚度的增加幅度变大。
In this study, the characteristics of side-projected planar shock waves propagating through grid turbulence were investigated using a counter-driver shock tube. At the location of visualization of the shock–turbulence interactions, the range of the shock Mach numbers wasand the representative values of the turbulent Mach numberswere. The interaction length between the shock wave and grid turbulence was in the range approximately fromtotimes the integral length scale of the turbulence. For the interaction involving the strongest turbulence with, the weakest planar shock wave withwas largely deformed and could not be detected on the projected shadowgraph and schlieren images. The density changes on the grayscale in the projected images of the shock waves weakened and expanded multidimensionally. This undetectable profile of the shock wave could indicate that the shock wave locally lost discontinuous property change profile. The shock waves withdid not show the undetectable profile in the projected image. In these cases, the projected thickness of the shock wave increased with an increase in the interaction length. The increase in the projected thickness became larger as the turbulent Mach number increased, and the shock Mach number decreased.