Performance of a magnetostrictive flow-induced vibrational power generator using a circular cylinder with either ribs or a fin plate

Abstract

The present paper describes the development of the magnetostrictive flow-induced vibrational power generator using a circular cylinder. Effects of a fin plate behind a cylinder and ribs on the side surface of a cylinder on the vibrational characteristics and the power generation of its generator were investigated by the wind tunnel test. The fin height L_f was changed from 0.25L, 0.5L, 0.75L, to 1L, and the rib height W_r was also changed from 1, 2, 4, 6, to 10 mm. The vibration for circular cylinders with a fin plate of L_f/L = 0.75 and 1 begins from Vr = 7. The vibration ceases at Vr > 14. Although the reduced velocity region for vibration increases more than without a fin plate, the maximum amplitude decreases less than without a fin plate. The onset velocity for a circular cylinder with ribs is Vr = 3.6. Although the reduced velocity region for vibration does not increase more than without ribs, the power generation for a circular cylinder with ribs of W_r ≥ 6 mm increases more than without ribs.