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At present, the geometric and aerodynamic characteristics for wind turbine airfoils with the medium thickness are studied to pursue maximum aerodynamic performance, while the interaction between blade stiffness and aerodynamic performance is neglected. Combining the airfoil functional integration theory and the mathematical model of the blade cross-section stiffness matrix, an integrated design method of aerodynamic performance and structural stiffness characteristics for the medium thickness airfoils is presented. It can increase both aerodynamic performance and the blade cross-sectional stiffness characteristics. A parametric optimal mathematical model of wind turbine airfoil profiles with medium thickness and blade crosssectional laminated parameters are established to maximum the aerodynamic performance and blade cross-sectional stiffness. The aerodynamic and structural comparison of WQ-B300 airfoil which is designed considering the change of the blade cross-sectional ply parameters and WQ-A300 airfoil which is designed without considering the change of the blade cross-sectional ply parameters is analyzed. Meanwhile, the aerodynamic performance comparison of WQ-B300 airfoil and DU97W-300 airfoil is studied. The results show that: compared with WQ-A300 airfoil, though the aerodynamic performance of WQ-B300 airfoil is slightly reduced, its blade cross-sectional stiffness properties are significantly improved which the flapwise and edgewise stiffness are increased by 6.2% and 8.4%, respectively. This study verifies the feasibility for the novel design method. Moreover, it also provides a good design idea for the wind turbine airfoils and blade structural properties with medium or large thickness.

Integrated Design of Aerodynamic Performance and Structural Characteristics for Medium Thickness Wind Turbine Airfoil