New dynamic-inflow engineering models based on linear and nonlinear actuator disc vortex models
article
Two new engineering models are presented for the aerodynamic induction of a wind turbine underdynamicthrust.ThemodelsaredevelopedusingthedifferentialformofDuhamelintegrals of indicial responses of actuator disc type vortex models. The time constants of the indicial functions are obtained by the indicial responses of a linearand a nonlinearactuatordisc model. The new dynamic-inflow engineering models are verified against the results of a Computational Fluid Dynamics (CFD) model and compared against the dynamic-inflow engineering models of Pitt-Peters, Øye, and Energy Research Center of the Netherlands (ECN), for several load cases. Comparisons of all models show that two time constants are necessary to predict the dynamic induction. The amplitude and phase delay of the velocity distribution shows a strong radial dependency. Verifying the models against results from the CFD model shows that the model based on the linearactuatordisc vortex modelpredicts a similarperformance as the Øye model. The model based on the nonlinear actuator disc vortex model predicts the dynamic induction betterthantheothermodelsconcerningbothphasedelayandamplitude,especiallyathighload
TNO Identifier
868626
ISSN
10954244
Source
Wind Energy, pp. 1-18.
Publisher
John Wiley and Sons Ltd
Pages
1-18
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