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dc.contributor.authorWalker, Stuart
dc.contributor.authorCappietti, Lorenzo
dc.date.accessioned2019-01-04T15:12:41Z
dc.date.available2019-01-04T15:12:41Z
dc.date.issued2017-04-07
dc.identifier.citationWalker, S., and Cappietti, L. (2017) ‘Experimental studies of turbulent intensity around a tidal turbine support structure’, Energies, 10 (4) DOI: 10.3390/en10040497en
dc.identifier.issn1996-1073
dc.identifier.doi10.3390/en10040497
dc.identifier.urihttp://hdl.handle.net/10545/623257
dc.description.abstractTidal stream energy is a low-carbon energy source. Tidal stream turbines operate in a turbulent environment, and the effect of the structure between the turbine and seabed on this environment is not fully understood. An experimental study using 1:72 scale models based on a commercial turbine design was carried out to study the support structure influence on turbulent intensity around the turbine blades. The study was conducted using the wave-current tank at the Laboratory of Maritime Engineering (LABIMA), University of Florence. A realistic flow environment (ambient turbulent intensity = 11%) was established. Turbulent intensity was measured upstream and downstream of a turbine mounted on two different support structures (one resembling a commercial design, the other the same with an additional vertical element), in order to quantify any variation in turbulence and performance between the support structures. Turbine drive power was used to calculate power generation. Acoustic Doppler velocimetry (ADV) was used to record and calculate upstream and downstream turbulent intensity. In otherwise identical conditions, performance variation of only 4% was observed between two support structures. Turbulent intensity at 1, 3 and 5 blade diameters, both upstream and downstream, showed variation up to 21% between the two cases. The additional turbulent structures generated by the additional element of the second support structure appears to cause this effect, and the upstream propagation of turbulent intensity is believed to be permitted by surface waves. This result is significant for the prediction of turbine array performance.
dc.description.sponsorshipAccess to the Laboratory of Maritime Engineering (LABIMA, University of Florence) was funded by the MARINET FP7 EU Project (Marine Renewables Infrastructure Network for emerging Energy Technologies)en
dc.language.isoenen
dc.publisherMDPIen
dc.relation.urlhttp://www.mdpi.com/1996-1073/10/4/497en
dc.rightsArchived with thanks to Energiesen
dc.subjectMarine energyen
dc.subjectTidal turbineen
dc.subjectTurbulenceen
dc.subjectSupport structureen
dc.subjectTidal energyen
dc.titleExperimental studies of turbulent intensity around a tidal turbine support structureen
dc.typeArticleen
dc.contributor.departmentUniversity of Sheffielden
dc.contributor.departmentUniversità degli Studi di Firenzeen
dc.identifier.journalEnergiesen
dc.relation.embeddedTidal stream energy is a low-carbon energy source. Tidal stream turbines operate in a turbulent environment, and the effect of the structure between the turbine and seabed on this environment is not fully understood. An experimental study using 1:72 scale models based on a commercial turbine design was carried out to study the support structure influence on turbulent intensity around the turbine blades. The study was conducted using the wave-current tank at the Laboratory of Maritime Engineering (LABIMA), University of Florence. A realistic flow environment (ambient turbulent intensity = 11%) was established. Turbulent intensity was measured upstream and downstream of a turbine mounted on two different support structures (one resembling a commercial design, the other the same with an additional vertical element), in order to quantify any variation in turbulence and performance between the support structures. Turbine drive power was used to calculate power generation. Acoustic Doppler velocimetry (ADV) was used to record and calculate upstream and downstream turbulent intensity. In otherwise identical conditions, performance variation of only 4% was observed between two support structures. Turbulent intensity at 1, 3 and 5 blade diameters, both upstream and downstream, showed variation up to 21% between the two cases. The additional turbulent structures generated by the additional element of the second support structure appears to cause this effect, and the upstream propagation of turbulent intensity is believed to be permitted by surface waves. This result is significant for the prediction of turbine array performance.en
dc.dateAccepted2017-04-05
refterms.dateFOA2019-02-28T18:01:53Z
html.description.abstractTidal stream energy is a low-carbon energy source. Tidal stream turbines operate in a turbulent environment, and the effect of the structure between the turbine and seabed on this environment is not fully understood. An experimental study using 1:72 scale models based on a commercial turbine design was carried out to study the support structure influence on turbulent intensity around the turbine blades. The study was conducted using the wave-current tank at the Laboratory of Maritime Engineering (LABIMA), University of Florence. A realistic flow environment (ambient turbulent intensity = 11%) was established. Turbulent intensity was measured upstream and downstream of a turbine mounted on two different support structures (one resembling a commercial design, the other the same with an additional vertical element), in order to quantify any variation in turbulence and performance between the support structures. Turbine drive power was used to calculate power generation. Acoustic Doppler velocimetry (ADV) was used to record and calculate upstream and downstream turbulent intensity. In otherwise identical conditions, performance variation of only 4% was observed between two support structures. Turbulent intensity at 1, 3 and 5 blade diameters, both upstream and downstream, showed variation up to 21% between the two cases. The additional turbulent structures generated by the additional element of the second support structure appears to cause this effect, and the upstream propagation of turbulent intensity is believed to be permitted by surface waves. This result is significant for the prediction of turbine array performance.


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