Hydrodynamic Investigation of a Concentric Cylindrical OWC Wave Energy Converter

Energies

Chongwei Zhang¹  Dezhi Ning¹  Yu Zhou¹ 

[1] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

关键词: oscillating water column;    wave energy;    wave diffraction;    eigen-function expansion;    potential flow theory;    air chamber;   

DOI  :  10.3390/en11040985

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown