Vortex-induced vibration response of a circular cylinder surrounded with small rods
Vortex-induced vibration response of a circular cylinder surrounded with small rods
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DOI：
10.1007/s42241-021-0045-5
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发表时间：
2021-06
影响因子：
2.5
通讯作者：
Liangbin Xu;S. Liang;Zhongming Hu;Zheng-li Liu;Jiasong Wang
中科院分区：
文献类型：
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作者：
Liangbin Xu;S. Liang;Zhongming Hu;Zheng-li Liu;Jiasong Wang
本文在风洞中研究了不同控制杆对圆柱绕流涡激振动（VIV）的影响。杆的数量设定为3和6，直径比sd/D（其中是小杆的直径，D是圆柱体直径）假定为0.10、0.16和0.20。间距比s（s = G/D，其中G是主缸表面和控制棒表面之间的差距距离）分别选择为0.2、0.4和0.6。基于主圆柱的雷诺数在Re = 4000 - 42000范围内。结果表明，控制棒的合理布置可以有效地抑制涡激振动。而杆与主缸之间的差距对涡激振动幅值响应的影响更大。当活塞杆与主缸的间距比为0.2时，涡激振动的最佳抑制率可达96.7%。然而，杆并不总是抑制涡激振动，并且在其他间距比（s = 0.4，0.6）下，响应可能更严重。并观察到典型的旋涡脱落频率锁定现象。当间距比为0.2时，尾流速度频谱中除了固有频率分量外，还存在St频率分量。
In this paper, cross-flow vortex-induced vibration (VIV) responses of a circular cylinder surrounded with different control rods have been investigated in a wind tunnel. The number of rodsnis set equal to 3 and 6, and the ratios of diametersd/D(wheredis the diameter of small rods,Dis the cylinder diameter) are assumed to 0.10, 0.16 and 0.20. The spacing ratios ofs(s=G/D, whereGis the gap distance between the main cylinder surface and the control rod surface) are selected as 0.2, 0.4 and 0.6 respectively. The Reynolds number based on the main cylinder is in the region ofRe= 4 000–42 000. Results show that the VIV can be significant suppressed if placing the control rods in appropriate arrangement. And the gap between the rod and the main cylinder plays a more important role in the VIV amplitude response. When the spacing ratio between the rod and main cylinder is 0.2, VIV can be best suppressed by 96.7%. However, rods do not always suppress VIV and the responses can be more severe in other spacing ratios (s= 0.4, 0.6). And typical vortex shedding frequency lock-in phenomenon can be observed. When the spacing ratio is 0.2, other than the natural frequency component,Stfrequency is also presented in the frequency spectrum of wake velocity.