Effects of Oscillation Parameters of a Wind Turbine Airfoil with Slip Velocities on Aerodynamic Loads

A wind turbine airfoil was analysed, using computational fluid dynamics (CFD) to study the oscillating effects and slip boundary conditions. The slip boundary condition is due to applying superhydrophobic surface. Fluids on these surfaces are repelled. The superhydrophobic surface can delay the icing on blades. The surfaces is assumed at the leading edge; the icing can occur on this region. The chosen oscillation parameters was enough for modelling dynamic stall. The dynamic stall cause a severe loading on the blade. This phenomenon is depicted by two vortices: leading edge vortex and trailing edge vortex. Three reduced frequencies are considered:  in a range of  slip lengths. In this regard, the Transition-SST model is applied for SD7037 airfoil with. The results showed that applying a superhydrophobic surface with low values of the slip length cannot be appropriate during the oscillating motion; but at the slip lengths larger than 100 microns, the aerodynamic coefficients are significantly changed. At the highest reduced frequency, the lift and drag coefficients are reduced about 12% and 40%, respectively. Increasing the slip length postponed the vortex formation and stall angle.