Abstract: Parameterization methods for airfoil profiles are most basic in optimization theories of wind turbine blades. A parameterization method based on Trajkovski transform and a trailing edge modification method named SOBIECZKY method are investigated. To overcome shortcomings of these methods, a hybrid trailing edge modification method is proposed. A genetic algorithm optimization model is constructed for the airfoil optimization by using these methods, which takes RAE2822 and NACA63215 as the initial airfoils, and also adopts optimal preservation strategy. Airfoil flow field analysis is made by using Xfoil. The results show that the hybrid modification method effectively overcomes shortcomings of Trajkovski transform and SOBIECZKY methods. Combined with the Trajkovski transform method, the hybrid modification method can control the airfoil profiles roundly and effectively, especially the trailing edge shape. The airfoil optimized from the combination shows a favorable aerodynamic performance.

Key words: Airfoil profiles, Genetic algorithm, Parameterization, Trailing edge modification methods