Power extraction in regular and random waves from an OWC in hybrid wind-wave energy systems

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dc.contributor.authorMichele, S.
dc.contributor.authorRenzi, E.
dc.contributor.authorPerez-Collazo, C.
dc.contributor.authorGreaves, D.
dc.contributor.authorIglesias, Gregorio
dc.contributor.funderRoyal Societyen
dc.contributor.funderConsiglio Nazionale delle Ricercheen
dc.date.accessioned2019-10-09T14:24:20Z
dc.date.available2019-10-09T14:24:20Z
dc.date.issued2019-10-03
dc.date.updated2019-10-09T13:58:56Z
dc.description.abstractA mathematical model is developed to analyse the hydrodynamics of a novel oscillating water column (OWC) in a hybrid wind-wave energy system. The OWC has a coaxial cylindrical structure in which the internal cylinder represents the mono-pile of an offshore wind turbine while the external cylinder has a skirt whose scope is to guide the wave energy flux inside the chamber. This layout is not casual, but consistent with the current approach to harnessing wave energy through hybrid systems. The device shape is rather complex and the boundary value problem is solved by applying the matching-method of eigenfunctions. Within the framework of a linearised theory, we model the turbine damping effects by assuming the airflow to be proportional to the air chamber pressure. Consequently, the velocity potential can be decomposed into radiation and diffraction problems. We study the effects of both skirt and internal radius dimensions on the power extraction efficiency for monochromatic and random waves. We show that the skirt has strong effects on the global behaviour, while the internal cylinder affects the values of the sloshing eigenfrequencies. Finally, we validate the analytical model with laboratory data and show a good agreement between analytical and experimental results.en
dc.description.sponsorshipRoyal Society — CNR International Fellowship (Grant NF170771)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid106519en
dc.identifier.citationMichele, S., Renzi, E., Perez-Collazo, C., Greaves, D. and Iglesias, G. (2019) 'Power extraction in regular and random waves from an OWC in hybrid wind-wave energy systems', Ocean Engineering, 191, 106519 (13 pp). doi: 10.1016/j.oceaneng.2019.106519en
dc.identifier.doi10.1016/j.oceaneng.2019.106519en
dc.identifier.endpage13en
dc.identifier.issn0029-8018
dc.identifier.journaltitleOcean Engineeringen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/8736
dc.identifier.volume191en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0029801819306572
dc.rights© 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 licence.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectWave energyen
dc.subjectOscillating water columnen
dc.subjectWave–structure interactionsen
dc.titlePower extraction in regular and random waves from an OWC in hybrid wind-wave energy systemsen
dc.typeArticle (peer-reviewed)en
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