Sink flow turbulent boundary layers
Sink flow turbulent boundary layers
复制标题
汇流湍流边界层
DOI：
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发表时间：
1969
影响因子：
3.7
通讯作者：
W. Jones
中科院分区：
文献类型：
--
作者：
B. Launder;W. Jones
汇流湍流边界层的研究与层压化问题有特殊的关系。其原因在于，在这些流动中，主要决定湍流边界层何时开始向层流恢复的加速度参数在站与站之间是恒定的。本文利用普朗特混合长度公式将湍流剪应力与平均速度梯度联系起来，给出了这类边界层的理论解。在墙体附近采用Van Driest混合长度推荐值，并选择Van Driest函数A+，使表面摩擦系数不超过某一最大值。结果表明，随着加速度参数的增大，湍流解向层流解的转变是合理的。
The study of sink flow turbulent boundary layers is of particular relevance to the problem of laminarization. The reason lies in the fact that the acceleration parameter which principally determines when a turbulent boundary layer will begin to revert towards laminar is, in these flows, constant from station to station. The paper presents theoretical solutions to this class of boundary layer by making use of the Prandtl mixing-length formula to relate the turbulent shear stress to the mean velocity gradient. Near the wall the Van Driest recommendation for mixing length is adopted and the Van Driest function, A+, is chosen such that the skin friction coefficient does not exceed a certain maximum value. The predicted solutions, which are in good agreement with available experimental data, display a plausible shift from the turbulent towards the laminar solution as the acceleration parameter is increased.