원통형 진동수주 파력발전장치에 의한 파 에너지 흡수

Abstract

In this paper, wave energy absorption of OWC(oscilating water column) device is analyzed. Theanalytic model consists of a partially immersed circular vertical cylinder open at its end and an air turbineconected with the air chamber. The boundary value problem is decomposed into scattering problem related toscatering by an incident wave in the absence of a pressure variation and radiation problem describing the flowdue to an oscillating pressure in the absence of an incident wave. By invoking the continuity of an air flow insidethe chamber, the oscillating presure in a chamber is derived. With oscilating pressure, the mean power absorbedby OWC device and the capture width are obtained. In numerical calculation, the induced volume flux acros theinternal fre surface of the chamber in the scatering and radiation problem and the maximum capture width arecompared with various design parameters such as radius and submergence depth of chamber and waveconditions. The maximum capture width obtained by choosing the optimal value of turbine constant occurs at thefirst resonant mode (Helmholtz mode) among the natural frequencies of a circular cylinder chamber.