The effects of Reynolds number and pressure gradient on the transitional spot in a laminar boundary layer.
The effects of Reynolds number and pressure gradient on the transitional spot in a laminar boundary layer.
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雷诺数和压力梯度对层流边界层过渡点的影响。
DOI：
10.1007/3-540-10289-2_32
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
I. Wygnanski
中科院分区：
文献类型：
--
作者：
I. Wygnanski
从过渡斑与完全湍流边界层中存在的大相干结构之间的可能关系出发，讨论了过渡斑的流动。简要回顾了已发表的结果，但本文强调了新数据。在对称平面上计算非湍流流体进入光斑的夹带，同时考虑光斑在垂直于边界方向上的生长。讨论了雷诺数对光斑生长的影响，以及有利压力梯度的影响。观察到，斑点由有序的涡流阵列组成，这些涡流在展向上产生条纹结构。
The flow associated with the transitional spot is discussed in view of the possible relationship between the spot and the large coherent structure existing in a fully turbulent boundary layer. A brief review of the published results is given, yet the paper stresses new data. The entrainment of non-turbulent fluid into the spot is calculated on the plane of symmetry, taking into account the growth of the spot in the direction normal to the boundary. The effects of Reynolds number on the growth of the spot is discussed, as well as some effect of favourable pressure gradient. It was observed that the spot consists of an orderly array of eddies which give rise to the streaky structure in the spanwise direction.