Abstract
In order to develop a vibrational power generator using the magnetostrictive material and the flow- induced vibration of a cantilevered rectangular prism, the experiments were performed in a wind tunnel. We focus on the low-speed galloping vibration for rectangular prisms with side ratio of D/H = 0.2, 0.3, 0.4, 0.5 (where D is the depth of the prism in the flow direction and H is the height of the prism) and the high-speed galloping vibration for a rectangular prism with side ratio of D/H = 1.0. The effect of a gap G between a prism and a splitter plate on the transverse vibration characteristic of prisms and the performance of vibrational power generator were investigated. In the case of a rectangular prism with D/H = 0.2, 0.3, 0.4, 0.5 without a splitter plate, the onset reduced velocity of vibration is lower than that of a rectangular prism with D/H = 1.0 because the low-speed galloping occurs. In the case of a rectangular prism with a splitter plate, the power of a rectangular prism with D/H = 0.2 with a splitter plate of a gap ratio G/H = 0.2 was highest. However, the amplitude increases as wind speed increases because the high-speed galloping occurs. The high-speed galloping leads to damage to the power generator. On the other hand, the rectangular prism with a splitter plate of G/H = 1.2 is better for the power generation than that with the other gap ratio.
