Effects of Incoming Wind Condition and Wind Turbine Aerodynamics on the Hub Vortex Instability

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dc.contributor.ORCID0000-0002-0990-8133 (Iungo, GV)en_US
dc.contributor.authorAshton, Ryanen_US
dc.contributor.authorViola, F.en_US
dc.contributor.authorGallaire, F.en_US
dc.contributor.authorIungo, Giacomo V.en_US
dc.contributor.otherSorensen J.N.en_US
dc.contributor.otherIvanell S.en_US
dc.contributor.otherBarney A.en_US
dc.contributor.utdAuthorAshton, Ryan
dc.contributor.utdAuthorIungo, Giacomo V.
dc.date.accessioned2016-07-07T21:24:43Z
dc.date.available2016-07-07T21:24:43Z
dc.date.created2015-06
dc.description.abstractDynamics and instabilities occurring in the near-wake of wind turbines have a crucial role for the wake downstream evolution, and for the onset of far-wake instabilities. Furthermore, wake dynamics significantly affect the intra-wind farm wake flow, wake interactions and potential power losses. Therefore, the physical understanding and predictability of wind turbine wake instabilities become a nodal point for prediction of wind power harvesting and optimization of wind farm layout. This study is focused on the prediction of the hub vortex instability encountered within wind turbine wakes under different operational conditions of the wind turbine. Linear stability analysis of the wake flow is performed by means of a novel approach that enables to take effects of turbulence on wake instabilities into account. Stability analysis is performed by using as base flow the time-averaged wake velocity field at a specific downstream location. The latter is modeled through Carton-McWilliams velocity profiles by mimicking the presence of the hub vortex and helicoidal tip vortices, and matching the wind turbine thrust coefficient predicted through the actuator disc model. The results show that hub vortex instability is promoted by increasing the turbine thrust coefficient. Indeed, a larger aerodynamic load produces an enhanced wake velocity deficit and axial shear, which are considered the main sources for the wake instability. Nonetheless, wake swirl also promotes hub vortex instability, and it can also affect the azimuthal wavenumber of the most unstable mode.en_US
dc.identifier.bibliographicCitationAshton, R., F. Viola, F. Gallaire, and G. V. Iungo. 2015. "Effects of incoming wind condition and wind turbine aerodynamics on the hub vortex instability." Journal of Physics: Conference Series (4th Wake Conference) 625(1), doi:10.1088/1742-6596/625/1/012033.en_US
dc.identifier.issn1742-6588en_US
dc.identifier.issue1en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4922
dc.identifier.volume625en_US
dc.language.isoenen_US
dc.publisherInstitute of Physics Publishingen_US
dc.relation.urihttp://dx.doi.org/10.1088/1742-6596/625/1/012033en_US
dc.rightsCC BY 3.0 (Attribution)en_US
dc.rights©2015 The Authorsen_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.source.journalJournal of Physics: Conference Series (4th Wake Conference, 2015)en_US
dc.subjectActuatorsen_US
dc.subjectAerodynamicsen_US
dc.subjectElectric utilitiesen_US
dc.subjectSystem interconnection, Electric poweren_US
dc.subjectEnergy harvestingen_US
dc.subjectShear flowen_US
dc.subjectStabilityen_US
dc.subjectSpeeden_US
dc.subjectWind poweren_US
dc.subjectWind turbinesen_US
dc.subjectStabilit--Analysisen_US
dc.subjectWake instabilitiesen_US
dc.subjectWind turbine aerodynamicsen_US
dc.subjectWind turbine wakesen_US
dc.subjectWakes (Aerodynamics)en_US
dc.titleEffects of Incoming Wind Condition and Wind Turbine Aerodynamics on the Hub Vortex Instabilityen_US
dc.type.genrearticleen_US

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Iungo, Giacomo V.
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