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Open AccessArticle

Hydrodynamic Investigation of a Concentric Cylindrical OWC Wave Energy Converter

by 1,2, 1,2 and 1,2,*
1
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2
Offshore Renewable Energy Research Center, Dalian University of Technology, Dalian 116024, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(4), 985; https://doi.org/10.3390/en11040985
Received: 22 March 2018 / Revised: 13 April 2018 / Accepted: 16 April 2018 / Published: 18 April 2018
(This article belongs to the Special Issue Wave Energy Potential, Behavior and Extraction)
A fixed, concentric, cylindrical oscillating water column (OWC) wave energy converter (WEC) is proposed for shallow offshore sites. Compared with the existing shoreline OWC device, this wave energy device is not restricted by the wave directions and coastline geography conditions. Analytical solutions are derived based on the linear potential-flow theory and eigen-function expansion technique to investigate hydrodynamic properties of the device. Three typical free-surface oscillation modes in the chamber are discussed, of which the piston-type mode makes the main contribution to the energy conversion. The effects of the geometrical parameters on the hydrodynamic properties are further investigated. The resonance frequency of the chamber, the power extraction efficiency, and the effective frequency bandwidth of the device is discussed, amongst other topics. It is found that the proposed OWC-WEC device with a lower draft and wider chamber breadth has better power extraction ability. View Full-Text
Keywords: oscillating water column; wave energy; wave diffraction; eigen-function expansion; potential flow theory; air chamber oscillating water column; wave energy; wave diffraction; eigen-function expansion; potential flow theory; air chamber
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Zhou, Y.; Zhang, C.; Ning, D. Hydrodynamic Investigation of a Concentric Cylindrical OWC Wave Energy Converter. Energies 2018, 11, 985.

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