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Energies 2016, 9(7), 540; doi:10.3390/en9070540

An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

1
Ocean College, Zhejiang University, Hangzhou 310058, China
2
Department of Ocean and Resources Engineering, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, USA
*
Author to whom correspondence should be addressed.
Academic Editor: John Ringwood
Received: 12 April 2016 / Revised: 20 June 2016 / Accepted: 9 July 2016 / Published: 13 July 2016
View Full-Text   |   Download PDF [1987 KB, uploaded 13 July 2016]   |  

Abstract

Integrating wave energy converters with breakwaters is a promising concept for wave energy utilization. On the basis of fulfilling the wave protection demands, pile-supported Oscillating Water Column (OWC)-type breakwaters can also meet the local needs of electricity far from the lands. In the present study, the wave energy extraction and vortex-induced energy loss of pile-supported OWC-type breakwaters were analyzed based on a two-point measurement method. The importance of energy extraction and vortex-induced energy loss on the wave energy dissipation of pile-supported OWC-type breakwaters were experimentally investigated. It was found that the trends of energy extraction and vortex-induced energy loss were generally correlated. The effects of the pneumatic damping induced by top opening affected the vortex-induced energy loss more than the energy extraction. Results showed that a larger pneumatic damping was preferable for the purpose of increasing energy extraction, whereas for a smaller pneumatic damping the vortex-induced energy loss was more important to the energy dissipation. With increasing draft, the energy extraction decreased, but the vortex-induced energy loss complementally contributed to the total energy dissipation and made the energy dissipation at the same level as that for a shallower draft. View Full-Text
Keywords: wave energy extraction; oscillating water column; pile-supported breakwater; wave energy dissipation; vortex-induced energy loss; orifice characteristics; pneumatic damping; experimental study wave energy extraction; oscillating water column; pile-supported breakwater; wave energy dissipation; vortex-induced energy loss; orifice characteristics; pneumatic damping; experimental study
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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

He, F.; Li, M.; Huang, Z. An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss. Energies 2016, 9, 540.

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