1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Nation Engineering Laboratory for High-Speed Railway Construction, Central South University, Changsha 410075, China
Abstract:The vortex-induced vibration (VIV) of a low mass circular cylinder near a flat plate was experimentally studied in wind tunnel. S/D, the gap-to-diameter ratio, was 0-2.5, and m*, the mass ratio of cylinder, was 43.6. The results show that, when S/D = 0, the cylinder remains stationary all the time, with increasing U*, and the vortex shedding is completely suppressed. when 0 < S/D < 0.6, the cylinder hits the wall periodically, and the upward amplitude is slightly larger than the downward one, and its wake form is single. when S/D ≥ 0.6, the cylinder vibration will not touch the wall. Different branches of the response amplitude appear for S/D ≥ 0.8, and the wake form of the cylinder becomes more abundant. When S/D reaches 2.5, the influence of the plate on the cylinder can be approximately ignored. The pressure distribution on the plate surface is affected by the cylinder amplitude and the gap. When the cylinder vibrates greatly, the fluctuating pressure on the surface of the plate increases significantly, and the fluctuating frequency is always consistent with the vibration frequency of the cylinder.
Key words: vortex-induced vibration; low mass ratio; gap ratio S/D; response branch; pressure coefficient.
陈聪1,王汉封1,2,邓国浩1,姚小敏1. 近平板圆柱涡激振动风洞实验研究[J]. 振动与冲击, 2022, 41(16): 65-72.
CHEN Cong1,WANG Hanfeng1,2,DENG Guohao1,YAO Xiaomin1. Experiments on vortex-induced vibration of a circular cylinder near a flat plate in a wind tunnel. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(16): 65-72.
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