Research And Application Of Dynamical Stall Model In Wind Turbine

The development of wind energy in the world energy is flourishing. It is a kind of clean and renewable energy. There is considerable wind energy resource in China and the development of wind energy satisfies with the development strategy. Although there are exciting new development, particularly CFD and theory of aerodynamics, the aerodynamic performance prediction is still one of the challenges.The performance prediction is necessary to determine the capability of the rotor and the cost of the wind turbine. However the aerodynamics of wind turbine is extremely complicated, due to the unsteady of wind and three dimensional effects of wind turbine.Main contents of this thesis are described as the following:1 The Leishman-Beddoes(L-B) dynamic stall model has been combined with Du-Selig static stall model to modify the flow separation point. It has been considered three dimensional and rotating effects. Then the model is used to predict the aerodynamic characteristics of the S809 aerofoil under different reduced frequency k and different average angle of attack. The results are compared with the experiment data.2 The L-B model has been used in calculating the NREL phase VI wind turbine to improve the results under yawed flow condition. The results are compared with the experiment data.3 The double multiple streamtube model has been used to calculate the performance of a company's products. There are some modifications to this model to improve its convergence.4 The double multiple streamtube model has been used to predict the aerodynamic characteristics of Sandia National Laboratories 17 meter Diameter Darrieus wind turbine. The results are compared with the experiment data. The L-B model has been used to improve the results during high wind velocity because the angle of attack is different in different azimuth angle.