Unsteady aerodynamic analysis of different multi mw horizontal axis offshore wind turbine blade profiles on sst-k-ω model

Abstract

To indicate the best airfoil profile for different sections of a blade, five airfoils; included S8xx, FFA and AH series was studied. Among the most popular wind power blades for this application were selected, in order to find the optimum performance. Nowadays, modern wind turbines are using blades with multi airfoils at different sections. SST-K-ω model with different wind speed at large scale profile applied to simulation of horizontal axis wind turbines (HAWT). The aerodynamic simulation was accomplished using Computational Fluid Dynamic (CFD) method based on the finite volume method. The governing equations apply in this simulation are the Unsteady Reynolds Averaged Navies Stocks (URANS) equations. The aerodynamic coefficients of lift and drag were calculated at different angles of attack and different wind speeds. The results are validated by Eppler code, Xfoil and experimental data of the U.S National Renewable Energy Laboratory (NREL). The results show that S818 profile is the best profile in terms of gaining the highest lift coefficient with the lowest angel of attack at the root of the blades. The results also indicated that the selected model can predicted the exact geometry with a high precision.