流力弾性振動状態の円柱群に作用する非定常流体力

抄録

In this paper we describe the flow around two-dimensional circular cylinder bundles supported by wires. The experiment was carried out in an N.P.L. blow-down-type wind-tunnel with a working section of 500mm×500mm×2000mm, and with the Reynolds number of 9.4×10³. The displacement, time-mean pressure distributions, and fluctuating pressure distributions of the oscillating circular cylinder were measured. The excitation mechanism of fluid-elastic vibration was investigated with the existing research. Consequently it was found that (i) while the displacement amplitude in X direction becomes larger than in Y direction, the occurrence of the fluid-elastic vibration is due to the jet switch for single row, and (ii) the displacement amplitude in Y direction is predominant as compared with that in X direction for three rows, and the fluid-elastic vibration occurs in the wake switch phenomenon.