回転振動する矩形柱の流力振動応答特性と制御 : 第1報,流力振動応答特性と発現機構(流体工学,流体機械)

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The response characteristics and suppression of flow-induced vibration of rectangular prisms with various width-to-height ratios were experimentally investigated. The present study focused on rotary oscillation, which is one of flow-induced vibrations generated in a rectangular prism. In this paper, the response characteristics on elastically supported prisms were first examined in detail by free-vibration test. Next, flow-induced vibrations obtained by the free-vibration test were reproduced by forced-vibration test, and then the generation mechanism of flow-induced vibrations was examined on the basis of the visualized flow patterns, fluctuating pressure distributions of the surface of prism and characteristics of flow-induced vibrations by the flow control. The main findings were that (i) there are three types of flow-induced vibrations, i. e., vortex excitation, low-speed torsion flutter and high-speed torsion flutter, (ii) flow-induced vibrations can be classified into six patterns depending on the width-to-height ratio, (iii) flow-induced vibrations occur due to change in fluctuating pressure on the surface of the prism based on the difference of the behavior of the shear layer separating from the leading edge, the impinging leading-edge vortex, and the wake vortices, and (iv) generation of low-speed torsion flutter and vortex excitation is completely suppressed by adopting large values of the reduced mass-damping factor, however, high-speed torsion flutter occurs regardless of the reduced mass-damping factor.
一般社団法人日本機械学会の論文
2003-06-25

回転振動する矩形柱の流力振動応答特性と制御 : 第1報,流力振動応答特性と発現機構(流体工学,流体機械)

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