Review : vortex shedding lock-on and flow control in bluff body wakes
Review : vortex shedding lock-on and flow control in bluff body wakes
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DOI：
10.1115/1.2926511
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发表时间：
1991-12
影响因子：
2
通讯作者：
O. Griffin;M. Hall
中科院分区：
文献类型：
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作者：
O. Griffin;M. Hall
最近的实验结果表明，当海崖体被放置在入射平均流中，其上叠加有周期分量时，也可以观察到旋涡脱落共振或锁定现象。这种形式的旋涡脱落和锁定表现出流动扰动和旋涡之间特别强的共振，并提供了几种有希望的方法之一，用于改进和控制海崖体近尾流中的基本公式和稳定性机制。给出了最近的直接数值模拟的旋涡锁定在周期性流动的例子。这与实验结果吻合得很好。还讨论了由于垂直于入射平均流和与入射平均流成直线的物体振荡、物体的旋转振荡以及声音对锁定的影响而引起的涡锁定。在这些和其他最近的和有关的结果的基础上，在主动和被动尾流控制的总体背景下讨论了锁定现象。特别强调对圆柱尾流的主动控制。
The results of recent experiments demonstrate that the phenomenon of vortex shedding resonance or lock-on is observed also when a bluff body is placed in an incident mean flow with a periodic component superimposed upon it. This form of vortex shedding and lock-on exhibits a particularly strong resonance between the flow perturbations and the vortices, and provides one of several promising means for modification and control of the basic formulation and stability mechanisms in the near-wake of a bluff body. Examples are given of recent direct numerical simulations of the vortex lock-on in the periodic flow. These agree well with the results of experiments. A discussion also is given of vortex lock-on due to body oscillations both normal to and in-line with the incident mean flow, rotational oscillations of the body, and of the effect of sound on lock-on. The lock-on phenomenon is discussed in the overall context of active and passive wake control, on the basis of these and other recent and related results, with particular emphasis placed on active control of the circular cylinder wake.