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Experimental Study of Turbulence Influence on Wind Turbine Performance

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dc.contributorNew Mexico State Universityen
dc.contributorVirginia Tech. Aerospace and Ocean Engineering Departmenten
dc.contributor.authorTalavera, Miguelen
dc.contributor.authorShu, Fangjunen
dc.date.accessioned2015-07-28T18:27:14Zen
dc.date.available2015-07-28T18:27:14Zen
dc.date.issued2015-06en
dc.description.abstractRegarding the issue about unmatched Reynolds number for downscaled wind turbine tests in wind tunnels, a study of the performance characteristics of a model wind turbine operating in the wake of another turbine of the same model under laminar and turbulent inflow was performed. The distance between the two turbines was set at 5, 10, and 15 turbine diameters. In the laminar inflow case, due to the low recovery rate in the wake of the front turbine, the efficiency of the rare turbine has been greatly reduced even when the distance was 15 diameters. To address this issue, turbulent inflow was created using an active grid system installed between the contraction and test-section of the wind tunnel; the maximum turbulence intensity can reach 20%. Velocity fields upstream and in the wake of the turbine were measured using a 2D-PIV system; 1000 pairs of images were acquired for each location to achieve statistical convergence. It was found that by using turbulent inflow the efficiency of both the upstream and the downstream turbine was highly improved. Also, it was found that the efficiency of both turbines is highly related to the turbulence intensity in the inflow. At a constant tip speed ratio for the upstream turbine of 10.3, and a distance of 5 diameters between them, the efficiency for the downstream turbine was 4.1 times higher than in laminar case; for 10 and 15 diameters with the same conditions it was 2.71, and 2.48 times higher respectively. The maximum efficiencies reached for the downstream turbine were 38.5%, 34.5%, and 24.6% for 15, 10, and 5 diameters of distance between respectively. Therefore, despite the low Reynolds number, a high efficiency close to the field was reached using turbulent flow created by an active grid system.en
dc.description.notesSession 0A - Atmosphere/Turbine/Wake Interactionsen
dc.description.notesTrack classification : Research and Development, and Technology ; Atmosphere/Turbine/Wake Interactions ; Graduate Student Symposiumen
dc.description.notesIncludes paper and PowerPoint slidesen
dc.format.extent2 pagesen
dc.format.mimetypeapplication/vnd.ms-powerpointen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationTalavera, M., & Shu, F. (2015, June). Experimental study of turbulence influence on wind turbine performance. Paper presented at the North American Wind Energy Academy 2015 Symposium, Blacksburg, VA.en
dc.identifier.urihttp://hdl.handle.net/10919/54695en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.relation.ispartofNorth American Wind Energy Academy 2015 Symposiumen
dc.rightsIn Copyrighten
dc.rights.holderTalavera, Miguelen
dc.rights.holderShu, Fangjunen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleExperimental Study of Turbulence Influence on Wind Turbine Performanceen
dc.title.alternativeExperimental Study of Turbulence Influence on Wind Turbine Performance and Wake Recoveryen
dc.typePresentationen
dc.type.dcmitypeTexten

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