Wind Turbine Aerodynamic Performance Simulation based on Improved Lifting Surface Free Wake Method

In order to simulate aerodynamic performance of wind turbine under high wind speed and different yaw angles accurately. The NREL Phase VI experiment is numerical example. Take stall delay resulted by blades rotation into consideration. Based on lifting surface free wake method, the coupling model of Kirchhoff- Helmholz trailing edge separation prediction model and Du- Selig 3D static stall delay model is introduced. The influence of vortex lattice numbers to calculation accuracy is discussed, with more accurate trailing edge separation position and bound wake induced velocity. The Kirchhoff-DuSelig coupling model is compared with the original Weissinger-L model on simulating high wind speed aerodynamic performance under different yaw angles. The result showed that the improved lifting surface model increases simulation accuracy significantly. And the set of two vortex lattices on the lifting surface gets the best simulation of normal force coefficient and tangent force coefficient. © 2017, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.