潮流発電に向けた弾性シートの３次元フラッタリング特性の解析

抄録

The environmental load can be minimized if the energy of the vibration produced by the tidal current can be obtained as electric power. We investigated the three-dimensional fluttering of the sheet with deflection in the width direction. The Reynolds number Re was varied in the range of 1.24 to 2.01×105 in the direction of flow from the fixed end to the free end of the sheet. The direction of the flow velocity was set as the x-axis and the direction of the gravity as the z-axis. As a result, fluttering with a phase difference was observed in the z-axis direction, indicating that the sheet exhibited three-dimensional fluttering. The frequency of fluttering under the same flow velocity condition was the same at the top and bottom of the free edge of the sheet, but the phase difference in each axis in the time displacement between the top and bottom of the free edge tended to decrease with increasing flow velocity. This may be attributed to the tilting of the vortex structure generated in the sheet against the z-axis direction due to the deflection of the sheet against its initial orientation.