ABSTRACT:

This paper presents the unique wave power station, where a pair of the floats supporting the platform is lined up at the interval of one wave length in the ocean swell/wave and the counter-rotating type hydroelectric unit with the vertical shaft is submerged at the center position of the platform. The station can get sufficiently higher energy than the traditional OWC types. That is, the flow velocity through the runners is two times faster than the oscillating ocean swell, and the platform works fruitfully in acceptable response to the swell oscillation regardless of the weight and the wave length. Besides, the motion of the platform can be predicted numerically and simply by the equation of oscillation.

INTRODUCTION

For the next leap in the exploitations of the renewable/sustainable energies, we are under obligations not only to cope with the warming global environment but also to conserve natural ecosystem and to coexist with nature. As for the fluid energy resources in the world, we can newly exploit the hydro-resources of about 2 TW on the land, the wind-resources of about 72 TW and the ocean-resources more than 2x103 TW. That is, the ocean-resources should occupy the attention of the sustainable power generation, and it is more required to prepare several kinds of the power unit suitable for the individual ocean circumstance. At the traditional wave power stations, the ocean swell, which is called in place of the wave to distinguish precisely between the ocean wave and the technical term "wave" as for the physically vibrating/oscillating phenomena, is changed to the oscillating air flow in the caisson or the buoy (OWC), and the air flow rotates the turbines such as Wells types, impulse types (Dorrell and Hsieh, 2008; Korean Fluid Machinery Association, 2007).

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