回転振動する矩形断面柱に作用する流体力特性 : 前線はく離渦形角柱の場合

概要

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Measurements are made of the time-averaged and fluctuating fluid forces, the vortex-shedding frequency and the behavior of the impinging leading-edge vortices of a rectangular cylinder forced into rotary oscillation. The rectangular cylinder having the width-to-height ratio B/H of 3 (H : height of cylinder, B : width of cylinder) in which vortices are formed at the leading edge is adopted. The cylinder is forced into rotary oscillation with angular displacements up to α=±5゜and the nondimensional frequency f^*H/U_0 (f^* : frequency of oscillating cylinder, U_0 : free-stream velocity)is varied from 0.01 to 0.27, in which the lock-in region is included. It is found that the fluid forces acting on the oscillating rectangular cylinder are strongly dependent on the impinging leading-edge vortices rather than the wake vortices. Also, it is recognized that the fluctuating fluid forces are mainly generated by the phase shift of surface pressure on the basis of the movement of the impinging leading-edge vortices along the side surface.
1996-07-25