円柱群の流力弾性不安定振動の励振機構

概要

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In order to clarify the self-exciting mechanism of flow-induced vibration in tube arrays, the flow pattern around the middle tube of three row model arrays and the unsteady fluid force acting on it have been investigated experimentally. Through observation of the flow pattern, it became clear that the exciting force is induced by the phase lag between wake switching or jet switching and the tube displacement. Additionally, as a result of measuring both the unsteady fluid force acting on the middle tube of the model array and its phase lead from the tube displacement, an important conclusion is derived, where two critical flow velocity lines, which are in an in-phase mode vibration and an out-of-phase one, intersect at the damping parameter 10. Therefore, the critical lines are in two regions which are on both sides of the damping parameter 10. This line agrees well with the reported one.
一般社団法人日本機械学会の論文
1985-11-25