Abstract
In order to construct a micro power generation system using a piezo-electric element, power generation was tried using excitation oscillation of the bluff cylinder by the vortex shedding from the bluff cylinder. The bluff cylinder consists of a board spring section in which the piezo-electric element was attached, and a body section. The bluff cylinder was inserted into the water flow, the shape and the submersion depth of the bluff cylinder, and the flow velocity were varied, and the power generation characteristic was investigated. As a result, it was found that it can generate electricity by vortex excitation. It was found that the length and the submersion depth of the body section influence power generation. It was shown that the power generation characteristic changes with cross-sectional shape of the bluff cylinder. The most suitable state was the case where the submersion depth was set to 140 mm with a circular cylinder with a span length of 250 mm. It is important to choose the power generation object which suited the use purpose.
Highlights
Considering an energy problem in recent years, it is interesting to exploit effectively the hydraulic power energy of the small scale and medium scale which is not yet used
Even when it changes into the piezo-electric buzzer, the power generation characteristic does not change, but since a case with a submersion depth of 140 mm of the body has wide peak width, it is thought that it is most suitable for the use
The following conclusions were obtained as a result of performing the characteristic test of the bluff cylinder pendulum aiming at generating electricity by vortex excitation
Summary
Considering an energy problem in recent years, it is interesting to exploit effectively the hydraulic power energy of the small scale and medium scale which is not yet used. Of low drop micro hydropower generation are performed actively. Those trends were reported by Turbomachinery Society of Japan [1, 2]. Development of new power generation technique or some method is needed In response to such background, the power generation method using the self oscillation (vortex excitation) by the vortex shedding from the bluff cylinder placed into the flow is proposed by Bemitsas et al [3], Uno & Kawashima [4], Koide et al [5] and Hiejima et al [6]. Some tests were performed by the power generation bluff cylinder which was inserted into the water flow. In such tests, the shape and the submersion depth of the submersion section, and the flow velocity were varied, and the power generation characteristic was investigated
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