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Energies 2017, 10(5), 712; doi:10.3390/en10050712

Hydrodynamic Investigation of an Oscillating Buoy Wave Energy Converter Integrated into a Pile-Restrained Floating Breakwater

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
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Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 27 March 2017 / Revised: 9 May 2017 / Accepted: 10 May 2017 / Published: 18 May 2017
(This article belongs to the Section Energy Sources)

Abstract

An analytical model is developed based on linear potential flow theory and matching eigenfunction expansion technique to investigate the hydrodynamics of a two-dimensional floating structure. This structure is an integration system consisting of a breakwater and an oscillating buoy wave energy converter (WEC). It is constrained to heave motion, and linear power take-off (PTO) damping is used to calculate the absorbed power. The proposed model is verified against the published results. The proposed integrated structure is compared with the fixed structure and free heave-motion structure, respectively. The hydrodynamic properties of the integrated structure with the optimal PTO damping i.e., the transmission coefficient, reflection coefficient, capture width ratio (CWR), and heave response amplitude operator (RAO), are investigated. The effect of the PTO damping on the performance of the integrated system is also evaluated. Results indicate that with the proper adjustment of the PTO damping, the proposed integrated system can produce power efficiently. Meanwhile, the function of coastal protection can be compared with that of the fixed structure. View Full-Text
Keywords: analytical study; linear potential flow theory; floating breakwater; wave energy extraction analytical study; linear potential flow theory; floating breakwater; wave energy extraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhao, X.; Ning, D.; Zhang, C.; Kang, H. Hydrodynamic Investigation of an Oscillating Buoy Wave Energy Converter Integrated into a Pile-Restrained Floating Breakwater. Energies 2017, 10, 712.

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