质量比对刚性圆柱体涡激振动影响的研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (11) : 248-254.

论文

质量比对刚性圆柱体涡激振动影响的研究

陈正寿1,2，赵宗文1，张国辉1，郑武3，颜盛汉4

作者信息 +

Study about the effect of mass ratio on vortex-induced vibration concerning rigid cylinder

CHEN Zheng-shou1,2, ZHAO Zong-wen1, ZHANG Guo-hui1，ZHENG Wu3，YAN Sheng-han4

Author information +

文章历史 +

摘要

基于CFD方法，开展了质量比对刚性圆柱体涡激振动影响的研究。对低质量比分别为1和2.4和高质量比为7的刚性圆柱体分别进行双自由度涡激振动流固耦合模拟，得到了不同质量比工况下无因次振幅与约化速度之间的相关性，圆柱体的“8”字形运动轨迹以及“差拍”、“相位转换”等现象；初步的研究结果表明，低质量比的模型对应的振动锁振区范围要广于高质量比的模型，产生的横流向最大无因次振幅也较大，涡激振动现象更为显著。另外通过不同质量比对顺、横流向耦合振动影响的分析发现，在质量比为1和2.4时，顺流向振动对横流向振动产生的影响不容忽略，而在质量比为7时，其影响较小。另在涡激振动尾流区，捕捉到了“2S”、“2P”型泻涡发放。

Abstract

Based on CFD method, study about the effect of mass ratio on vortex-induced vibration (VIV) concerning rigid cylinder has been carried out. Numerical simulations of 2-degree freedom fluid-structure interaction relating rigid cylinder with mass ratios of 1, 2.4 and 7 have been performed. The relationship between normalized amplitude and reduced velocity about two mass ratios has been presented, as well as the eight-circle cylindrical trajectory, beat and phase switch phenomena. The preliminary research shows that the ‘lock-in’ region relating mass ratio of 1 and 2.4 widens than that relating mass ratio of 7. At the same time, the cross-flow maximum amplitude is larger than the latter, leading to the occurrence of obviously enhanced VIV. In addition, through analyzing the effect of mass ratio on coupling oscillation due to in-line and cross-flow vibrations, it can be found that the effect of in-line vibration on the final vibration form could not be ignored, when the mass ratio is relatively lower, e.g. 1 and 2.4 in this paper. On the other hand, the influence is very small, in the case of higher mass ratio, e.g. 7 in this paper. Finally, ‘2S’ and ‘2P’ vortex shedding modes have also been found in the wake.

导出引用

陈正寿1,2，赵宗文1，张国辉1，郑武3，颜盛汉4. 质量比对刚性圆柱体涡激振动影响的研究[J]. 振动与冲击, 2017, 36(11): 248-254

CHEN Zheng-shou1,2, ZHAO Zong-wen1, ZHANG Guo-hui1，ZHENG Wu3，YAN Sheng-han4. Study about the effect of mass ratio on vortex-induced vibration concerning rigid cylinder[J]. Journal of Vibration and Shock, 2017, 36(11): 248-254

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