A comparison of the structure of the wake behind a circular cylinder in a steady flow with that in a perturbed flow
A comparison of the structure of the wake behind a circular cylinder in a steady flow with that in a perturbed flow
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DOI：
10.1063/1.866170
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发表时间：
1987
影响因子：
4.6
通讯作者：
B. J. Armstrong;F. H. Barnes;I. Grant
中科院分区：
文献类型：
--
作者：
B. J. Armstrong;F. H. Barnes;I. Grant
描述了使用条件平均技术确定的圆柱体后面的湍流尾流的结构。该结构适用于稳定流以及在稳定分量上叠加在线速度扰动的流。选择扰动频率以使涡旋脱落的频率锁定到扰动频率。比较两种尾流的结构，发现锁定后发生了很大的变化，涡流强度增加，横向分离减小。据估计，涡流强度的增加是由于从圆柱体脱落的涡量的增加以及涡流形成过程中幸存的涡量的微小变化造成的。该模型，戴维斯[J.流体机械。 75, 209 (1976)] 发现很好地表示了平均尾流，用于与实验结果进行比较。一般来说，一...
A description is given of the structure of the turbulent wake behind a circular cylinder that was determined using a conditional averaging technique. The structure was found for a steady flow and also for a flow in which an in‐line velocity perturbation was superimposed on the steady component. The perturbation frequency was chosen so that the frequency of vortex shedding locked‐in to the perturbation frequency. The structures of the two wakes are compared and it is found that large changes occur with lock‐in, with the strength of the vortices increasing and their lateral separation decreasing. It is estimated that the increase in the vortex strength results from an increase in the amount of vorticity shed from the cylinder and also a small change in the amount of vorticity surviving the vortex formation process. The model, which Davies [J. Fluid Mech. 75, 209 (1976)] found gave a good representation of the average wake flow, was used to provide comparisons with the experimental results. In general, the a...