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引用次数: 63
摘要
剪切层生长的基本物理机制已经在计算中显示在非常高的压缩性下发生变化。采用双隔膜激波隧道驱动的高超声速混合层设施,可达到排污式设施无法达到的可压缩性水平。采用纹影和丙酮平面激光诱导荧光成像方案,对mc = 0.86和1.7处的混合层进行了流式、平面和端视图的检测。对这些图像的分析可以得到归一化的剪切层生长速率、剪切层快速侧的浓度信息,以及大尺度结构的行为以及相关的声辐射的可视化。归一化的增长率数据报告,mc = 0.80-2.25,从平均纹影图像导出。本文选自第二届国际湍流和剪切流动现象研讨会论文集(KTH-Stockholm, 2001年6月27-29日),作者E Lindborg, A Johansson, J Eaton, J Humphrey, N Kasagi, M Leschzine…
EVOLUTION AND GROWTH OF LARGE SCALE STRUCTURES IN HIGH COMPRESSIBILITY MIXING LAYERS
The basic physical mechanisms for shear layer growth have been shown in computations to change at very high compressibilities. A double diaphragm, shock tunnel driven hypersonic mixing layer facility is used to reach compressibility levels not possible in blowdown-type facilities. Mixing layers at M c = 0.86 and 1.7 are examined in streamwise, plan, and end views using Schlieren and acetone planar laser-induced fluorescence imaging schemes. Analysis of these images yields normalized shear layer growth rates, concentration information on the fast side of the shear layer, and visualization of the behaviour of large-scale structures along with the associated acoustic radiation. Normalized growth rate data are reported for M c = 0.80–2.25 as derived from averaged Schlieren images. This article was chosen from selected Proceedings of the Second International Symposium on Turbulence and Shear Flow Phenomena (KTH-Stockholm, 27-29 June 2001) ed E Lindborg, A Johansson, J Eaton, J Humphrey, N Kasagi, M Leschzine...