2018 矩形柱の cross-flow 振動に対する迎え角変動の影響

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  • Effect of attack angle fluctuation superimposed on the cross-flow oscillation of a rectangular cylinder in uniform flow

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It is known that a large cross-flow oscillation called the galloping is generated for a rectangular cylinder in uniform flow, in addition to the Karman vortex excitation. However, for practial machines and structures it is rather rare that the motion is the pure cross-flow oscillation, since other oscillation modes such as attack-angle fluctuation or in-line oscillation can be superimposed depending on the supporting structure. In this study, the cross-flow oscillation of a rectangular cylinder supported by a plate-spring system is investigated using a wind tunnel for the purpose of clarifying the effect of attack angle fluctuation on the excitation. The oscillation behaviors of the rectangular cylinder are greatly different depending on the supporting structures, i.e., the pure cross-flow oscillation, the cross-flow oscillation with an in-phase attack angle oscillation and that with an anti-phase attack angle oscillation. The cause of these different oscillation behaviors is the fluctuation of lift due to the attack angle fluctuation superimposed on the cross-flow oscillation.

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