Performance of liftdrag combined wind turbine rotor
Zhao Zhenzhou1,2, Zheng Yuan1,2, Song Chenguang1, Zhao Zhenning3
(1.College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098,China; 2.National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing, Jiangsu 210098, China; 3.North China Electric Power Research Institute Co.Ltd., Beijing 100045, China)
In order to get partial performance of liftdrag combined wind turbine,such a turbine rotor with 900 mm height and 900 mm diameter was simulated using the SST k-ω turbulence model.Effects of the diameter and height ratios on the performance of the lift and drag type rotors were analyzed,and the power coefficients were compared between the combined rotor and the pure lifttype one.The results showed that the drag rotor increases the torque of the combined rotor but decreases the torque of the lift rotor at 0° rotation angle downstream.When the diameter ratio is 0.3 and the height ratio is 0.5,the combined rotor gets a maximum power coefficient of 0.32.In lower speed the performance of combined rotor is obviously better than that of pure lift rotor,while in high speed the former is same as or even worse than the latter.In order to verify the precise of model data,a plastic wind rotor with same scales as the simulation model was tested in a wind tunnel and the torque and speed were measured by a torque dectetor.The results showed the predicted efficiency is higher than the experimental data by 2% only.The error is so small that the SST k-ω model can be used to analyze the flow field of a combined wind turbine.
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