Experimental evidence for non-linear growth in compressible mixing layer
Experimental evidence for non-linear growth in compressible mixing layer
复制标题
可压缩混合层非线性增长的实验证据
DOI：
10.1007/s11433-014-5432-2
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发表时间：
2014-03
期刊：
影响因子：
--
通讯作者：
Zhen-Su She
中科院分区：
文献类型：
--
作者：
Jun Chen;Xiao-Tian Shi;Ning Hu;Zhen-Su She
利用平面激光米氏散射（PLMS）技术对乙醇液滴在可压缩混合层中的流动进行了实验研究。在对流马赫数Mc = 0.11和0.47的两种流动条件下收集了大量的数字图像。在混合区的相干涡，辫子和喷发进行了观察，解释为多尺度，在高雷诺数的三维结构的证据。混合层沿流向沿着呈现两个阶段，即初始混合阶段和充分发展阶段。利用混合层的相似性，提出了一种新的测量CML厚度增长率的方法--灰度系综平均法（GLEAM）。CML的非线性增长的新证据的报告，提供了一个解释以前的观察的增长率的散射。
An experimental study of compressible mixing layers (CMLs) was conducted using planar laser Mie scattering (PLMS) visualizations from condensed ethanol droplets in the flow. Large ensembles of digital images were collected for two flow conditions at convective Mach numbersMc= 0.11 and 0.47. The coherent vortices, braids and eruptions in the mixing zone were observed, interpreted as evidence of multi-scale, three-dimensional structures at a high Reynolds number. The mixing layers with a large visualized range present two stages along the streamwise direction, corresponding to the initial mixing and the well-developed stage. A new method, the gray level ensemble average method (GLEAM), by virtue of the similarity of the mixing layer, was applied to measure the growth rate of the CML thickness. New evidence for a nonlinear growth of CML is reported, providing an interpretation of previous observations of the scattering of the growth rate.
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