Similarity Analysis for Turbulent Boundary Layer with Pressure Gradient: Outer Flow
Similarity Analysis for Turbulent Boundary Layer with Pressure Gradient: Outer Flow
复制标题
具有压力梯度的湍流边界层的相似性分析：外流
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
W. George
中科院分区：
文献类型：
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作者：
L. Castillo;W. George
将George和Castillo对零压力梯度边界层外部的平衡型相似分析推广到包括有压力梯度的边界层。一个新的压力梯度参数的恒常性是表征这些新的平衡湍流边界层所必需的。得到了三个主要结果：首先，大多数压力梯度边界实验似乎是平衡流动（根据新定义），而非平衡流动似乎是例外。其次，压力梯度参数似乎只有三个值：一个为不利压力梯度，一个为有利压力梯度，一个为零压力梯度。第三，相应地，似乎只有三个归一化的速度亏缺剖面，与理论所建议的完全一致
The equilibrium-type similarity analysis of George and Castillo for the outer part of zero pressure gradient boundary layers has been extended to include boundary layers with pressure gradient. The constancy of a single new pressure gradient parameter is all that is necessary to characterize these new equilibrium turbulent boundary layers. Three major results are obtained: First, most pressure gradient boundary experiments appear to be equilibrium flows (by the new definition), and nonequilibrium flows appear to be the exception. Second, there appear to be only three values of the pressure gradient parameter: one for adverse pressure gradients, one for favorable pressure gradients, and one for zero pressure gradients. Third, correspondingly, there appear to be only three normalized velocity deficit profiles, exactly as suggested by the theory