Application of 3-D dynamic stall model in wind turbine aerodynamic performance prediction

A 3-D dynamic stall model based on a low aspect ratio rectangular wing is modified for the rotating wind turbine blade with high aspect ratio. Only one tip vortex is trailed and is appropriately coupled with the blade element theory and 3-D rotational effect model for the calculation of both the wind turbine gross performance and 3-D unsteady aerodynamic airloads in different flow environments. The comparison between the calculated results and the experimental data demonstrates that the wind turbine unsteady aerodynamic performance prediction is improved when the 3-D dynamic stall model is included. For completeness, both the scheme and the calculated results are discussed. It is demanstrated that the 3-D dynamic stall characteristic of the willd turbine blade is simulated better by the propose model than by other models.