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The effect of lip extrusion on performance of a breakwater integrated bent duct OWC WEC

Howe, D ORCID: 0000-0001-7941-1803, Nader, J-R ORCID: 0000-0002-5689-7342, Orphin, J and MacFarlane, G ORCID: 0000-0002-0518-430X 2017 , 'The effect of lip extrusion on performance of a breakwater integrated bent duct OWC WEC', in Proceedings of the 12th European Wave and Tidal Energy Conference , European Wave and Tidal Energy Conference 2017, Ireland, 1098.1-1098.9 .

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Abstract

Oscillating Water Column (OWC) Wave Energy Converters(WECs) are one of the most studied, developed and tested devicesassociated with Ocean Renewable Energy (ORE) today.Variations in concept design and hydrodynamic characteristicshave been researched extensively, however the main issueassociated with ORE is the high Levelised Cost of Energy (LCOE).One of the most promising applications devised to potentiallydecrease the LCOE is maritime structure integration by sharingthe costs associated with construction, and lowering the costs ofmaintenance. This paper investigates physical modelexperimentation into the effect that lip extrusion of a breakwaterintegrated bent duct type OWC has on the performance. Theimportance of the investigation has implications regarding tuningof the device for site-specific breakwater integration andconstructability. It is documented that a bent duct OWC observeschange in its natural resonance frequency through variation inlength of the swept path of the geometrical cross-section.Subsequently, lip extrusion could present a way of tuning thedevice to suit a site-specific sea state, and is a design considerationthat will affect both optimal power absorption andconstructability. It was found that the longer the lip extrusion thelower the performance and that the no lip extrusion case resultedin the maximum non-dimensional capture width of 2.2 comparedto the maximum lip extrusion considered in this papercorresponding to 1.4. This is a positive result for constructionconsideration as less materials are required, however, using lipextrusion to tune OWC resonance might come at the cost ofperformance.

Item Type: Conference Publication
Authors/Creators:Howe, D and Nader, J-R and Orphin, J and MacFarlane, G
Keywords: oscillating water column, wave energy converter, breakwater, hydrodynamic experimentation, performance
Journal or Publication Title: Proceedings of the 12th European Wave and Tidal Energy Conference
Publisher: European Wave and Tidal Energy Conference 2017
ISSN: 2309-1983
Copyright Information:

Copyright 2017 European Wave and Tidal Energy Conference

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