Aerodynamic Analysis of the Darrieus Wind Turbines Including Dynamic-Stall Effects

Comparisons have been made between aerodynamic performance predictions using two dynamic-stall methods and experimental data for a 17-m Sandia wind turbine. These dynamic-stall models are the incidence delay methods originating from Boeing-Vertol and from the Massachusetts Institute of Technology, which are based on numerical correlations of the dynamic-stall delay with pitch rate parameter. The MIT model calculations show that aerodynamic coefficients are underestimated in comparison with those of the Gormont model, even if the shape of the curves is quite the same. The MIT model provides a good prediction of the dynamic-stall regime. This is characterized by a plateau oscillating near the experimental data of the rotor power vs wind speed at the equator