Experimental study on the lock-in of an oscillating circular cylinder confined in a plane channel
Experimental study on the lock-in of an oscillating circular cylinder confined in a plane channel
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平面通道内振荡圆柱体锁定实验研究
DOI：
10.1016/j.expthermflusci.2021.110348
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发表时间：
2021-01
影响因子：
3.2
通讯作者：
Zhang Jian
中科院分区：
文献类型：
--
作者：
Zhang Peng;Li Zhiping;Pan Tianyu;Du Lin;Li Qiushi;Zhang Jian
本文介绍了在中等雷诺数Re = 2000的均匀流场中，圆柱受迫横向振荡时，壁面边界对脱落涡锁定特性的影响的实验研究结果。设计了一种高度可调的流动通道，以研究边界效应。分别通过改变阻塞比和振荡幅度来研究系统的锁定行为。当阻塞比超过某一临界值时，边界效应被观察到，静止圆柱的Strouhal数非线性地增加。随着阻塞比的增大，闭锁区的上下限均向激励频率的下限移动，闭锁区的范围先减小后增大。边界改变了振幅对锁定行为的影响。当没有边界效应时，随着振荡幅度的增加，观察到锁定区域的V形边界，并且锁定区域的范围单调增加。相比之下，在边界的影响下，锁定区的范围首先随着振荡幅度的增加而增加，然后随着振荡幅度的增加而减小。在受迫振动系统中，当阻塞比和振动幅值在一定范围内变化时，在锁定区的下限附近首先观察到滞环，滞环的大小受阻塞比和振动幅值的影响。
The results of an experimental study concerning wall boundary effects on the lock-in behavior of the shedding vortex of a circular cylinder, which is forced to oscillate transversely in a uniform flow at moderate Reynolds numberRe = 2000, are presented in this paper. A height-adjustable flow channel is designed to study the boundary effect. Two sets of experiments are organized to study the lock-in behavior by changing the blockage ratio and oscillation amplitude separately. When the blockage ratio exceeds a critical value, the boundary effects are observed and the Strouhal number of the stationary cylinder increases non-linearly. As the blockage ratio increases, both the lower and upper limits of the lock-in region move to the lower value of excitation frequency, and the extent of the lock-in region decreases first and then increases. The boundary changes the effects of oscillation amplitude on lock-in behavior. When free from the boundary effect, as the oscillation amplitude increases, a V-shaped boundary of the lock-in region is observed, and the extent of the lock-in region increases monotonically. In comparison, under the influence of the boundary, the extent of the lock-in region first increases with the increase of the oscillation amplitude, and then decreases with the increase of the oscillation amplitude. Hysteresis loops are first observed near the lower limits of the lock-in region for some ranges of blockage ratio and oscillation amplitude in a forced-vibration system, and the extent of the hysteresis loop is affected by the two parameters.
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