Abstract:Wind turbines in humid and cold regions often suffer blades icing problems resulting in the loss of power generation. In the paper, the CFD methods combining with ice equivalent roughness model are carried out on NREL S809 airfoils and a 300kW wind turbine rotor to investigate the influence of ice roughness on aerodynamic performance of wind turbine blades. The conclusions are as follows. For slight ice not to change the airfoil shape, the 2D profile aerodynamic performance decreases with the increase of ice surface width and ice roughness height, especially more remarkably in higher AOAs (angle of attack). For rime or glaze ice, glaze ice causes greater damage, however, the rime-iced profile is influenced by ice roughness more significantly. In terms of 3D rotor with iced blades, the aerodynamic performance declines more dramatically at higher wind speed. In addition, both the output torque and axial thrust of the rotor decrease with the increase of ice roughness, and the downtrends are becoming more apparent with the increase of the wind speed. The results will provide a valuable reference for both wind farm operation and generator system evaluation in icing districts.
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