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J. Ocean Eng. Technol. > Volume 25(1); 2011 > Article
J. Ocean Eng. Technol. 2011;25(1):8-13.    
DOI: https://doi.org/10.5574/KSOE.2011.25.1.008   

Estimation of Wave Energy Extraction Efficiency for a Compact Array System of Small Buoys
Choi Yoon-Rak
School of Naval Architecture and Ocean Engineering University of Ulsan
밀집 배열 부이시스템의 파랑에너지 추출 효율 추정
최윤락
울산대학교 조선해양공학부
© 2011 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Wave energy extraction, Compact array system of buoys, Higher order boundary element method, Hydrodynamic interaction of multi-body system
핵심용어: 파랑에너지 추출, 밀집 배열 부이시스템, 고차경계요소법, 다물체시스템의 유체역학적 상호작용
Abstract
A compact array system of small buoys is used for wave energy extraction. To evaluate the performance of this system, hydrodynamic analysis is carried out in regular waves using the higher order boundary element method. The motion response of each buoy is calculated considering hydrodynamic interactions caused by other buoys. The effect of energy extraction device is modeled as a linear damping load. The efficiencies of energy conversion are compared using the various sizes and arrangements of the array system and the damping coefficients for energy extraction. The increase in size or the packing ratio of the system gives better efficiency. However, the wave condition and the cost for the system should be considered to optimize performance from the perspective of engineering and economics. The proposed nondimensionalized damping coefficient for energy extraction is 0.1~0.5.


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