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首页> 外文期刊>Ocean Engineering >Flow behavior behind a clockwise-and-counterclockwise rotational oscillating cylinder
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Flow behavior behind a clockwise-and-counterclockwise rotational oscillating cylinder

机译：顺时针和逆时针旋转振荡缸后的流动特性

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摘要

Flow characteristics downstream of a rotational oscillating cylinder at Reynolds number Re = 300 was investigated. The experiments were conducted using a model cylinder in a recirculating open water channel and the flow field was captured by using the Particle Image Velocimetry (PIV) technique. The model cylinder was set to undergo clockwise-and-counterclockwise rotation at selected angular amplitude (angular amplitude a varying from 0 to 360 degrees) and at the lock-on frequency ratio F-r = 1.0 (where Fr = f(n)/f(v), the ratio of the forcing frequency f(n) to the natural vortex shedding frequency f(v)). The effects of rotational movement of the cylinder on the near wake downstream of the cylinder were interpreted in terms of the instantaneous vorticity patterns, as well as the time averaged streamline topology, mean velocity distributions and Reynolds shear stress contours. Based on the observation of the flow patterns and vortex contours, it was deduced that the clockwise-and-counterclockwise rotation produced significant effect on the wake and modified the wake flow structures and vortex shedding patterns. The time-averaged streamline structures appeared to be non-symmetrical about the longitudinal axis of the flow.
机译：研究了雷诺数Re = 300时旋转振荡缸下游的流动特性。实验是在循环开放水道中使用模型缸进行的，并且通过使用粒子图像测速（PIV）技术捕获了流场。将模型圆柱体设置为在选定的角度幅度（角度幅度a从0到360度变化）和锁定频率比Fr = 1.0（其中Fr = f（n）/ f（ v），即强迫频率f（n）与自然涡旋脱落频率f（v）的比值。根据瞬时涡度图，时间平均流线拓扑，平均速度分布和雷诺剪切应力等高线解释了圆柱体旋转运动对圆柱体下游近尾流的影响。根据对流动模式和涡流轮廓的观察，可以推断出顺时针和逆时针旋转对尾流产生了显着影响，并修改了尾流结构和涡流脱落模式。时间平均流线结构似乎是关于流的纵轴不对称的。

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