Experimental study on the flow-induced vibration of two tandem stepped cylinders in uniform flow

被引：0
|
作者：
Ji C. [1 ]
Zhang Y. [1 ]
Yin T. [1 ]
Zhao Y. [1 ]
Yuan D. [2 ]
Xu D. [1 ]
机构：
[1] State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin
[2] School of Mechanical Engineering, Tianjin University, Tianjin
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 14期
关键词：
flow-induced vibration; spacing ratio; stepped cylinder; tandem cylinders;
D O I：
10.13465/j.cnki.jvs.2023.14.033
中图分类号：
学科分类号：
摘要：
The flow-induced vibration of two tandem stepped cylinders in uniform flow was investigated experimentally in the range of Reynolds number from 570 to 5 000, with the coverage ratio of the stepped cylinders being R =50% and the spacing ratio being D/d = 1.5. In the experiments, the upstream cylinder was fixed and the downstream cylinder vibrated freely in the cross-flow direction. Four spacing ratios of s/D* =2, 4, 8 and 16 were investigated and the corresponding in-phase and out-of-phase arrangements of the upstream and downstream cylinders were considered. The results show that the spacing ratio has a significant effect on the interaction between the tandem stepped cylinders, and a change in spacing ratio alters the gap flow pattern between the cylinders which leads to the different vibration characteristics of the downstream cylinder. For the out-of-phase arrangement of the tandem cylinders, the downstream cylinder undergoes wake-induced vibration when the spacing ratio is small and the reduced velocity is high. That is, the amplitude increases significantly with the increasing of the reduced velocity. However, when the spacing ratio s/D* ≥8, the influence of the geometry shape phase is negligible. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：278 / 286
页数：8
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