The effect of initial conditions on the development of a free shear layer
The effect of initial conditions on the development of a free shear layer
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初始条件对自由剪切层发展的影响
DOI：
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发表时间：
1966
影响因子：
3.7
通讯作者：
P. Bradshaw
中科院分区：
文献类型：
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作者：
P. Bradshaw
分离点和完全发展的湍流混合层的最后接近点之间的距离被发现是初始边界层的动量亏损厚度的一千倍的数量级，无论后者是层流还是湍流。在混合层的虚拟原点上也有相应的大位移，从而产生虚假的雷诺数效应，这给模型喷流或钝基物体的试验造成相当大的困难，这可能是在马赫数对自由剪切层发展的影响上产生分歧的原因。这些影响进行了解释。
The distance between the separation point and the final approach to a fully developed turbulent mixing layer is found to be of the order of a thousand times the momentum-deficit thickness of the initial boundary layer, whether the latter be laminar or turbulent. There are correspondingly large shifts in the virtual origin of the mixing layer, resulting in spurious Reynolds-number effects which cause considerable difficulties in tests of model jets or blunt-based bodies, and which are probably responsible for the disagreements over the influence of Mach number on the development of free shear layers. These effects are explained.