被动湍流控制对三个串联气缸流动诱导振荡的干扰效应

Huaijun Li, M. Bernitsas, Hai Sun
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引用次数: 0

摘要

串联圆柱体的流动诱导振荡(FIO)特性会因圆柱体之间的干扰而发生变化。识别正干扰和负干扰对于设计涉及弹性支撑上气缸的海洋结构至关重要。对单个气缸、两个串联气缸和三个串联气缸进行了实验,以研究将一个相同的振荡气缸置于上游、下游以及上下游时产生的干扰。关键参数(阻尼、刚度)和雷诺数(Re)在试验中变化。确定并分析了这些情况下的涡流诱发振动(VIV)和奔腾现象。当在基本振荡器附近放置干扰气缸时,气缸振荡的起始流入速度会降低,并实现背靠背的 VIV 和奔腾。下游圆筒产生的干扰增强了基本振荡器的 FIO。在 VIV 区域,一个干扰下游圆筒比两个干扰下游圆筒更有效。在奔腾区,当刚度和阻尼比较低时,两个干涉圆柱体的增强效果更好。当刚度较高时,干扰上游气缸往往会抑制基本振荡器的 FIO。在 VIV 区域,一个上游圆筒的抑制作用比两个上游圆筒的抑制作用更强,而在奔腾区域则相反。如果在基本振荡器的下游和上游都放置两个干扰圆柱体,则在刚度较低时,其 FIO 会增强,而在刚度较高时,则会受到抑制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interference effects on flow-induced oscillation of three tandem cylinders with passive turbulence control
The characteristics of flow-induced oscillation (FIO) of cylinders in tandem change due to interference between cylinders. Identifying positive and negative interferences is vital for designing marine structures involving cylinders on elastic supports. Experiments on a single cylinder, two tandem-cylinder and three tandem-cylinder cases were conducted to study the interference due to placing an identical oscillating cylinder upstream, downstream, and both upstream and downstream. Critical parameters (damping, stiffness) and Reynolds number (Re) are varied in the tests. Both vortex-induced vibration (VIV) and galloping in these cases are identified and analyzed. The onset inflow velocity of oscillation for the cylinder is reduced and back-to-back VIV and galloping is achieved, when placing interference cylinder/s in the vicinity of the basic oscillator. The interference due to the downstream cylinder enhances FIO of the basic oscillator. In the VIV region, one interference downstream cylinder is more effective than two interference downstream cylinders. In the galloping region, the enhancement improves for two interference cylinders for lower stiffness and damping ratios. The interference upstream cylinder tends to suppress FIO of the basic oscillator for higher stiffness. The suppression due to one upstream cylinder is more vigorous than that due to two upstream cylinders in the VIV region and the opposite is true in the galloping region. When two interference cylinders are placed both downstream and upstream of the basic oscillator, its FIO is enhanced for the lower stiffness whilst it is suppressed for the higher stiffness.
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