Numerical study on the limit of power extraction by a dense cross-stream array of wind turbines

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dc.contributor.authorTartari, Filiberto
dc.contributor.authorNishino, Takafumi
dc.date.accessioned2017-08-29T13:57:28Z
dc.date.available2017-08-29T13:57:28Z
dc.date.issued2017-06-27
dc.description.abstractA numerical study is presented on the upper limit of power extraction by a dense cross-stream array of wind turbines, using 3D Reynolds-averaged Navier–Stokes simulations of flow over porous discs. The main objectives are: (i) to investigate the effect of ‘local blockage’ due to neighbouring turbines on the limit of power extraction; and (ii) to clarify how this effect compares with the effect of ‘local flow acceleration’ obtained by staggering the array in the streamwise direction. Some unconventional array configurations with vertical turbine arrangements, following the so-called ‘multi-rotor’ concept, are also investigated. Results show that the limit of power extraction by a non-staggered array increases moderately with the number of turbines arrayed (about 5% increase in the power coefficient compared to the Betz limit when 9 turbines are arrayed side-by-side). This power increase due to the local blockage can be enhanced further, but only slightly for the case of 9 turbines, by arranging turbines vertically as well as horizontally. Staggering the array in the streamwise direction may increase the power of downstream turbines due to the effect of local flow acceleration but reduce the power of upstream turbines as the local blockage effect diminishes, resulting in a total power reduction.en_UK
dc.identifier.citationTartari F, Nishino T, Numerical study on the limit of power extraction by a dense cross-stream array of wind turbines, European Journal of Mechanics B - Fluids, Vol. 65, September-October 2017, pp. 350-358en_UK
dc.identifier.issn0997-7546
dc.identifier.urihttp://dx.doi.org/10.1016/j.euromechflu.2017.06.003
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12400
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectBlockage effecten_UK
dc.subjectEfficiencyen_UK
dc.subjectMulti-rotoren_UK
dc.subjectStaggered arrayen_UK
dc.subjectWind farmen_UK
dc.titleNumerical study on the limit of power extraction by a dense cross-stream array of wind turbinesen_UK
dc.typeArticleen_UK

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