Abstract:

the current airfoil design methods are based on one point of design angle of attack, in order to seek the local maximum aerodynamic performance without considering the whole high aerodynamic performance within continuous design angle of attack. Based on airfoil functional integral and complicated profile curvature smooth continuity theory, a novel airfoil design method considering continuous angle of attack is presented. It not only can make the aerodynamic force convergence, but also make the whole aerodynamic performance increased. the aerodynamic comparison of the WQ-B airfoil series which are designed considering continuous angle of attack and the WQ-A airfoil series which are designed without considering continuous angle of attack is analyzed. Meanwhile, the WQ-B airfoil series are used to a real 2 MW wind turbine blade. The results are showed that, compared to the WQ-A airfoil and the actual blade, the WQ-B airfoil series and new blade exhibit better whole performance. This study verifies the feasibility for the novel design method. Moreover, it also indicates that the WQ-B airfoil series have broad generality and substitutability.

Key words: airfoil functional integral, blade performance, surface curvature smooth continuity, continuous angle of attack