3814 直列2円柱の流力振動に関する研究(J15-1 流体関連の騒音と振動(1)-円柱と渦-,J15 流体関連の騒音と振動,2005年度年次大会)

概要

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Flow-induced vibration of tandem circular cylinders has been experimentally studied by free-oscillation tests in a wind tunnel. The upstream cylinder model with the reduced mass-damping parameter Cn=4.59, 7.14 was supported by eight coil springs to be moved in the cross-flow direction, and the downstream cylinder model was fixed. The gap between the upstream and downstream cylinders was changed from s/D=0.25 to 3.0. We measured the responses of the model in cross-flow oscillation and the vortex-shedding frequency. For the gap ratios of s/D≦1.0, the oscillation is induced by the vortex induced vibration from the critical reduced velocity Vr_<cr>, and in range of high velocity, the oscillation continues by flow-induced vibration. The upstream circular cylinder with the gap ratios of s/D≧2 vibrates by vortex induced vibration, similar to that of the single circular cylinder.
社団法人日本機械学会の論文
2005-09-18