基于模型试验和数值模拟的柔性串列圆柱体涡激振动研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (6) : 64-73.

论文

宋虹，黄维平，付雪鹏

作者信息 +

Vortex induced vibration of flexible tandem cylinders based on model tests and numerical simulations

SONG Hong，HUANG Weiping，FU Xuepeng

Author information +

文章历史 +

摘要

采用物理模型试验和CFD数值模拟方法研究了大长径比、低质量比的柔性串列圆柱体涡激振动现象。通过分析串列圆柱振幅、振动频率、受力特性和流场结构等特性，着重研究流速和圆柱间距对下游圆柱涡激振动特性影响。研究发现，上、下游圆柱涡激振动幅值差别较大，并且当流速大于某个值后，两者主导频率也不相同，由此提出分离约化速度Ur。流速和间距都会影响上游尾流对下游圆柱的作用，其中流速会影响上游尾涡强度及其发展程度，间距会影响上游尾涡发展空间及其与下游圆柱的接触位置。

Abstract

The vortex-induced vibration of flexible tandom cylinders with large aspect ratio and low mass ratio was studied by model tests and CFD numerical simulations.By analyzing the characteristics of the tandem cylinders such as amplitude, vibration frequency, force characteristics and flow field structure, the effects of flow velocity and distance between tandem cylinders on the vortex-induced vibration characteristics of downstream cylinder were investigated.It is found that the amplitudes of vortex-induced vibration of the upstream and downstream cylinders, are rather different and the dominant frequencies are also different when the velocity is greater than a certain value.Thus the concept of separate reduced velocity Ur was proposed.Both the velocity and spacing affect the effect of upstream wake on downstream cylinder.The velocity affects the strength and development of the upstream wake, and the spacing affects the development space of the upstream wake and the contact position between upstream wake and downstream cylinder.

导出引用

宋虹，黄维平，付雪鹏. 基于模型试验和数值模拟的柔性串列圆柱体涡激振动研究[J]. 振动与冲击, 2020, 39(6): 64-73

SONG Hong，HUANG Weiping，FU Xuepeng. Vortex induced vibration of flexible tandem cylinders based on model tests and numerical simulations[J]. Journal of Vibration and Shock, 2020, 39(6): 64-73

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