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Wave Energy Absorption by a Circular Cylinder Oscillating Water Column Device  

조일형 (제주대학교 해양과학대학)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.14, no.1, 2002 , pp. 8-18 More about this Journal
Abstract
In this paper, wave energy absorption of OWC(oscillating water column) device is analyzed. The analytic model consists of a partially immersed circular vertical cylinder open at its end and an air turbine connected with the air chamber. The boundary value problem is decomposed into scattering problem related to scattering by an incident wave in the absence of a pressure variation and radiation problem describing the flow due to an oscillating pressure in the absence of an incident wave. By invoking the continuity of an air flow inside the chamber, the oscillating pressure in a chamber is derived. With oscillating pressure, the mean power absorbed by OWC device and the capture width are obtained. In numerical calculation, the induced volume flux across the internal free surface of the chamber in the scattering and radiation problem and the maximum capture width are compared with various design parameters such as radius and submergence depth of chamber and wave conditions. The maximum capture width obtained by choosing the optimal value of turbine constant occurs at the first resonant mode (Helmholtz mode) among the natural frequencies of a circular cylinder chamber.
Keywords
oscillating water column; wave energy device; eigenfunction expansion method; resonant;
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