The numerical simulation of separated flow at large attack angles for a wind turbine airfoil

In order to accurately predict the aerodynamic performance of the separated flows of a wind turbine airfoil at large attack angles and provide a reliable numerical simulation method for the design and safe operation of the wind turbine,aiming at a certain type of wind turbine airfoil,an aerodynamic performance was numerically simulated by using LES model,RNG k-e model and Standard k-e model based on unsteady incompressible Navier-Stokes equations respectively,and the aerodynamic parameters at various attack angles ranging from 35 °to 90 ° was calculated when the Reynolds number is 2×106.By comparing the calculation results of the different turbulence models with wind tunnel test data and analyzing the flow field,it is shown that LES model can accurately simulate the separation of the airfoil surface flows,and its calculated results,which are better than RNG k-e model's and Standard k-e model's,agree well with the experimental data.