軸対称物体のすきま流れ振動 : 第1報, 軸対称物体に及ぼす流体力の解析

概要

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An analytical investigation is presented on leakage-flow-induced vibrations of an axisymmetric body. In the case of a narrow annular passage between a tapered outer cylinder and a tapered axisymmetric body, the fluid-dynamic forces exerted on the body were calculated by Galerkin's method. From the calculated results, the following conclusions were obtained. The dynamic instability of the systems is due to phaselag of the fluid-dynamic force for the harmonic vibration of the body. The fluid-dynamic damping is obtained in two parts: one is independent of the frequency and the other is a function of the frequency, and the negative damping is caused by the fluid-dynamic damping which is a function of the frequency. When the frequency is very large, the fluid-dynamic mass agrees with the added mass within the rest fluid.
一般社団法人日本機械学会の論文
1991-04-25