Concept and performance of a novel wave energy converter: Variable Aperture Point-Absorber (VAPA)

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dc.contributor.authorZheng, Siming
dc.contributor.authorZhang, Yongliang
dc.contributor.authorIglesias, Gregorio
dc.contributor.funderChina Postdoctoral Science Foundationen
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2020-03-10T09:45:38Z
dc.date.available2020-03-10T09:45:38Z
dc.date.issued2020-01-30
dc.date.updated2020-03-10T09:35:25Z
dc.description.abstractOcean waves are a huge and largely untapped resource of green energy. In order to extract energy from waves, a novel wave energy converter (WEC) consisting of a floating, hollow cylinder capped by a roof with a variable aperture is presented in this paper. The power take-off (PTO) system is composed of a linear generator attached to the seabed, driven by the heave motion of the floating cylinder through a tether line. The air pressure within the cylinder can be modified by adjusting the roof aperture. The hydrodynamic characteristics of this WEC are investigated through an analytical model based on potential flow theory, in which the wave diffraction/radiation problems are coupled with the air pressure fluctuation and PTO system. Analytical expressions are derived for the maximum power absorbed by the WEC under different optimization principles, revolving around the PTO damping, roof aperture damping and non-negative mooring stiffness. We find that the best power absorption is obtained when the aperture is either completely open or entirely closed, depending on the wave conditions. Intermediate values of the aperture are useful to minimize the heave motion and thus ensure survivability under extreme sea states.en
dc.description.sponsorshipChina Postdoctoral Science Foundation (Grant No. 2016M601041; 2017T100085); National Natural Science Foundation of China (51679124; 51479092); European Commission (Intelligent Community Energy (ICE), INTERREG V FCE Contract No. 5025)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationZheng, S., Zhang, Y. and Iglesias, G. (2020) 'Concept and performance of a novel wave energy converter: Variable Aperture Point-Absorber (VAPA)', Renewable Energy, 153, pp. 681-700. doi: 10.1016/j.renene.2020.01.134en
dc.identifier.doi10.1016/j.renene.2020.01.134en
dc.identifier.eissn1879-0682
dc.identifier.endpage700en
dc.identifier.issn0960-1481
dc.identifier.journaltitleRenewable Energyen
dc.identifier.startpage681en
dc.identifier.urihttps://hdl.handle.net/10468/9738
dc.identifier.volume153en
dc.language.isoenen
dc.publisherElsevier Ltd.en
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0960148120301567
dc.rights© 2020, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectWave poweren
dc.subjectWave energy converteren
dc.subjectMarine renewable energyen
dc.subjectOcean energyen
dc.subjectPoint-absorberen
dc.titleConcept and performance of a novel wave energy converter: Variable Aperture Point-Absorber (VAPA)en
dc.typeArticle (peer-reviewed)en
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