MEASUREMENTS OF TURBULENCE IN A ZERO-MEAN-SHEAR MIXED LAYER
MEASUREMENTS OF TURBULENCE IN A ZERO-MEAN-SHEAR MIXED LAYER
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DOI：
10.1017/s0022112079001105
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发表时间：
1979-01-01
影响因子：
3.7
通讯作者：
MCDOUGALL, TJ
中科院分区：
文献类型：
--
作者：
MCDOUGALL, TJ
本文讨论了在无平均流的情况下，混合层中和通过密度界面的湍流的实验室测量。目前的结果证实了Hopfinger & Toly（1976）的结论，即混合层中的紊流不受边界密度界面上流体的缓慢卷吸的显著影响。在一个均匀的流体中，湍流强度被发现是令人惊讶的不均匀，甚至两个网格网格距离远离网格。通过密度界面（在混合层的夹带边界）也进行了速度测量，这里的紊流变化方式与Hunt和Graham（1978）的理论有些相似。这些速度测量与激光多普勒风速计，他们是可能的一种新的实验技术，消除了折射率的变化，通常发生在湍流，密度分层的液体流。
This paper is concerned with laboratory measurements of turbulence in a mixed layer and through a density interface, in the absence of a mean flow. The present results confirm the conclusion of Hopfinger & Toly (1976) that the turbulence in a mixed layer is not significantly affected by the slow entrainment of fluid across the bounding density interface. In a homogeneous fluid the turbulence intensity is found to be surprisingly non-uniform, even two grid mesh distances away from the grid. Velocity measurements have also been taken through a density interface (at the entraining boundary of a mixed layer) and the turbulence here varies in a manner that bears some resemblance to the theory of Hunt & Graham (1978). These velocity measurements were taken with a laser-Doppler anemometer and they were made possible by a novel experimental technique which eliminates the refractive index variations which normally occur in a turbulent, density-stratified liquid flow.