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Maximising the hydrodynamic performance of offshore oscillating water column wave energy converters
journal contribution
posted on 2023-05-21, 05:02 authored by Eric GubeschEric Gubesch, Nagi AbdussamieNagi Abdussamie, Irene PenesisIrene Penesis, Christopher ChinChristopher ChinThis paper provides a thorough examination and discussion of a design process developed to improve the hydrodynamic performance of an asymmetrical offshore Oscillating Water Column (OWC) Wave Energy Converter (WEC). The resulting WEC geometry was based on a column-stabilised semi-submersible platform where an asymmetrical OWC chamber was integrated into the moonpool of the platform, resembling both, a purpose built WEC, or an existing offshore structure retrofitted for wave energy conversion. The performance of a 1:36 scale model of the OWC WEC was designed using a validated computational fluid dynamics (CFD) method and experimentally tested to evaluate the effect of the external support structure on the hydrodynamic performance of the device. Detailed analysis included physical and numerical decay tests to quantify the natural period of the OWC moonpool, wave and OWC-structure interactions, turbine damping coefficients and hydrodynamic capture width ratios. The obtained results revealed that the addition of the external support structure improved the OWC Capture Width Ratio (CWR) from 0.849 at kd ∼ 2.53 to 1.541 at kd ∼ 2.99 (81.5% increase). It was also observed that the external support structure shifted the peak performance towards higher frequency waves.
Funding
Institute of Marine Engineering, Science & Technology
History
Publication title
Applied EnergyVolume
308Article number
118304Number
118304Pagination
1-18ISSN
0306-2619Department/School
Australian Maritime CollegePublisher
Elsevier Sci LtdPlace of publication
The Boulevard, Langford Lane, Kidlington, Oxford, England, Oxon, Ox5 1GbRights statement
© 2021 Elsevier Ltd.Repository Status
- Restricted