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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.A: Fluid-Structure Interaction >SYMMETRIC VORTEX SHEDDING FROM A CIRCULAR CYLINDER UNDER PERIODIC FLOW FORCING
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SYMMETRIC VORTEX SHEDDING FROM A CIRCULAR CYLINDER UNDER PERIODIC FLOW FORCING

机译：周期性流动作用下圆柱体的对称涡旋脱落

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摘要

This paper describes an experimental study of the near wake of a circular cylinder subjected to streamwise flow forcing. The wake field is examined by PTV and LDV for excitation frequencies in which symmetric shedding is likely. The results show that symmetric formation of vortex pairs occurs close to the cylinder synchronized with the oscillatory component of the flow. The symmetric mode rapidly breaks down and gives rise to an antisymmetric arrangement of single vortices further downstream. The number of cycles for which the symmetrical vortices persist in the near wake is a probabilistic function of the excitation frequency and forcing amplitude. Details of the related wake kinematics and frequencies are shown and the findings are discussed in relation to symmetric vortex formation occurring in self-excited streamwise oscillations.
机译：本文描述了受流向强迫作用的圆柱体近尾流的实验研究。 PTV和LDV针对可能出现对称脱落的激励频率检查了唤醒场。结果表明，涡流对的对称形成在圆柱体附近发生，与流动的振荡成分同步。对称模式迅速崩溃，并在下游产生单个涡旋的反对称排列。对称涡旋在近尾流中持续的周期数是激励频率和强迫振幅的概率函数。显示了有关尾流运动学和频率的详细信息，并讨论了与自激流向振荡中出现的对称涡流形成有关的发现。

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