Abstract
An optimum aerodynamic design method for the new type of difiuser augmented wind turbine (DAWT) called "wind-lens turbine" has been developed. A blade loading distribution and a wind-lens shape is simultaneously optimized by the design method. Aerodynamic performances of the optimal and conventional cases are obtained from experiments and Reynolds averaged Navier-Stokes (RANS) simulations. The output power coefficients of the optimal case obtained from the experimental results are superior to those of the conventional case and the Betz limit. Three-dimensional flow fields of the optimal and conventional cases have been investigated by the experiments and the RANS simulations. The results show that the aerodynamic performance of wind-lens turbine is significantly affected by the interrelationship between the internal and external flow fields around the wind-lens. Therefore, the simultaneous optimization of rotor blade and wind-lens is important for the aerodynamic design of the wind-lens turbine.
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