流力振動発電用柱状物体の周囲流れに関する実験的研究

抄録

Magnetostrictive vibrational power generator, which are expected to be applied to flow-induced vibration power generation, can obtain higher power generation as the frequency increases. Since low-speed galloping oscillates at a reduced velocity lower than the reduced resonance velocity, the frequency increases and is suitable for magnetostrictive vibrational power generation. However, the relationship between the fluid force generated in the vibrating object and the surrounding flow during low-speed galloping is still unclear. Therefore, we conducted a free vibration experiment using a rectangular cylinder and a plate spring in a wind tunnel, and investigated the relationship between the fluid force generated in a rectangular cylinder with a side ratio of 0.2 and the surrounding flow during low-speed galloping. Multisite simultaneous measurement using hot-wire anemometers was used to measure the circulation around a rectangular cylinder, and the relationship with the surrounding flow was investigated. As a result, it was found that the fluid force has a phase lead of about 60° with respect to the vibration displacement. In addition, it was found that the induced velocity due to circulation can be captured using hot-wire anemometers.