A study of compressible turbulent reattaching free shear layers
A study of compressible turbulent reattaching free shear layers
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DOI：
10.2514/3.9254
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发表时间：
1985-07
期刊：
影响因子：
2.5
通讯作者：
M. Samimy;H. Petrie;A. Addy
中科院分区：
文献类型：
--
作者：
M. Samimy;H. Petrie;A. Addy
本文对马赫数为2.46、雷诺数为5.01 × 107/m、带有湍流边界层的流动在25.4mm高的后台阶上的几何分离所形成的二维、可压缩、湍流再附自由剪切层进行了实验研究。风洞测试段经过专门设计，以在台阶处获得恒压分离。流场的详细调查是利用纹影系统，静压水龙头，和一个双分量符合激光多普勒测速仪。与不可压缩的再附着自由剪切层相反，在再附着区域内观察到湍流水平、剪切应力和湍流三重产物的显著增加。大的湍流结构和增强的混合观察到的再发展区。
An experimental investigation was conducted to study the two-dimensional, compressible, turbulent reattaching free shear layer formed by the geometrical separation of a Mach 2.46 flow with a turbulent boundary layer and a Reynolds number of 5.01 X 107/m from a 25.4 mm high backward-facing step. The wind tunnel test section was specifically designed to obtain a constant pressure separation at the step. A detailed survey of the flowfield was made utilizing a Schlieren system, static pressure taps, and a two-component coincident laser Doppler velocimeter. In contrast to incompressibl e reattaching free shear layers, significant increases in the turbulence level, shear stress, and turbulent triple products were observed within the reattachment region. Large turbulence structure and enhanced mixing were observed in the redeveloping region.