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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
ROTATIONAL EFFECTS ON THE SPANWISE PERIODIC FLOW OVER A WIND TURBINE AIRFOIL
Submission Author:
Daniel Sampaio Souza , SP
Co-Authors:
Daniel Sampaio Souza, Elmer Gennaro
Presenter: Daniel Sampaio Souza
doi://10.26678/ABCM.ENCIT2020.CIT20-0291
Abstract
The effect of rotation on the steady flow field around a wind turbine airfoil is studied using computational fluid dynamics. Periodicity is imposed in the spanwise direction in order to disregard the influence of the three-dimensional geometric features of the full blade. The Reynolds-averaged Navier-Stokes equations are solved with the open source platform OpenFOAM. Simulations for two rather high angles of attack confirm the separation delay predicted by theoretical boundary-layer investigations. A lift increase of more than 60% is observed for an angle of attack of 16º and the predicted effect of rotation on the drag depends on the angle of attack considered. Interestingly, the model predicts a reduction of the recirculation region’s volume, although no significant spanwise gradient of the flow field is observed. In summary, the model seems to be a viable tool to investigate the underlying physics of the rotational augmentation phenomenon.
Keywords
Aerodynamics, wind energy, HAWT, Rotational augmentation, Finite volume method
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