Characteristic length scales for vortex detachment on plunging profiles with varying leading-edge geometry
Characteristic length scales for vortex detachment on plunging profiles with varying leading-edge geometry
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DOI：
10.1007/s00348-013-1660-x
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发表时间：
2014-01-01
影响因子：
2.4
通讯作者：
Tropea, Cameron
中科院分区：
文献类型：
--
作者：
Rival, David E.;Kriegseis, Jochen;Tropea, Cameron
在自由表面水洞中进行了前缘涡（LEV）的生长和从倾伏剖面上脱离的实验。在雷诺数Re = 10，000、折合频率k = 0.25和Strouhal数St = 0.16时，对三种不同的前缘几何形状进行了直接力和速度场测量。示出的前缘形状的影响剪切层供给LEV，从而在一定程度上的LEV和相关的流拓扑结构的发展。这种效应又影响后（LEV）驻点在后缘处的到达时间，一旦突破，就构成LEV的脱离。据发现，尽管微小的相位变化LEV分离通过前缘形状，后缘的位置（弦长）应选择作为特征长度尺度的涡流分离过程。
Experiments on leading-edge vortex (LEV) growth and detachment from a plunging profile have been conducted in a free-surface water tunnel. Direct-force and velocity-field measurements have been performed at a Reynolds number of Re = 10,000, a reduced frequency of k = 0.25, and a Strouhal number of St = 0.16, for three varying leading-edge geometries. The leading-edge shape is shown to influence the shear layer feeding the LEV, and thus to some extent the development of the LEV and associated flow topology. This effect in turn influences the arrival time of the rear (LEV) stagnation point at the trailing edge, which, once breached, constitutes a detachment of the LEV. It is found that despite minor phase changes in LEV detachment through leading-edge shape, the position of the trailing edge (chord length) should be chosen as the characteristic length scale for the vortex separation process.