Calculation And Analysis Of Aerodynamic Loading For Large Wind Turbine Airfoils

In this thesis, the wind turbine airfoil S809’s static and dynamic aerodynamic performance isstudied by CFD. Meanwhile the representative of the NREL PHASE VI horizontal axis wind turbineblade’s performance is also analysed. The research contents of this work include:(1) For the static performance of S809airfoil, we use four turbulence models to simulate theS809airfoil. It is found that the simulation result of the SST k-ω turbulence model is closest to theresult of experiment. Due to the full turbulence simulation, the drag coefficient is larger than theexperiment value, and the lift coefficient is smaller than the experiment value before the separation.But at a high angle of attack, the separation point which is predicted by the S-A model and the k-εmodel is delayed compared to the experimental value. As a result, the lift coefficient is higher than theexperiment value significantly. Then we compare the surface pressure distribution and the flow fieldunder some conditions which are simulated by the SST k-ω turbulence model, and study the airfoil’saerodynamic performance under the condition of static stall.(2)For the dynamic performance of S809airfoil, we obtain the hysteresis curve of lift coefficientand drag coefficient in dynamic stall, and analyse the airfoil’s surface pressure distribution and theflow field under some typical conditions, and also study the S809airfoil’s dynamic stall. It is foundthat the simulation results are consistent with the static simulation results. And we get the hysteresiscurve of airfoil lift coefficient and drag coefficient. But the critical angle of attack is large before theairfoil stall. This is different with the experiment results, which can be disadvantage of the fullyturbulent simulation. It has been observed in the airfoil simulation of the static performance.(3)For the numerical simulation of NREL PHASE VI three dimensional blade in rotating flowfield, we get some basic properties for the blade. Compared with the experiment results, it is foundthat the simulation results of Fluent is acceptable. But it still has some error in quantity. The numericalsimulation’s accuracy of the wind turbine blades will be improved in the future work.