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)
Abstract：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.
［1］孙云峰.小型垂直轴风力发电机组的设计与实验［D］.呼和浩特:内蒙古农业大学能源与动力工程学院,2008. ［2］Fujisawa N,Shibuya S.Observations of dynamic stall on darrieus wind turbine blades［J］.Journal of Wind Engineering and Industrial Aerodynamics,2001,89(2):201-214. ［3］Fujisawa N,Takeuchi M.Flow visualization and PIV measurement of flow field around a darrieus rotor in dynamic stall［J］.Journal of Visualization,1999,1(4):379-386. ［4］Yang Wei,Quan Yong,Jin Xinyang,et al.Influences of equilibrium atmosphere boundary layer and turbulence parameter on wind loads of lowrise buildings［J］.Journal of Wind Engineering and Industrial Aerodynamics,2008,96(10／11):2080-2092. ［5］李 岩,田川公太朗.基于烟线法的直线翼垂直轴风力机静态流场可视化试验［J］.可再生能源,2009,37(3):32-35.Li Yan,Kotaro Tagawa.A visual experiment by smoke wire way on the static flow field of a straightbladed vertical axis wind turbine［J］.Renewable Energy Resources,2009,37(3):32-35.(in Chinese) ［6］赵振宙,郑 源,周大庆,等.基于数值模拟Savonius风力机性能优化研究［J］.太阳能学报,2010,31(7):907-911.Zhao Zhenzhou,Zheng Yuan,Zhou Daqing,et al.Optimization of the performance of Savonius wind turbine based on numerical study［J］.Acta Energiae Solaris Sinica,2010,31(7):907-911.(in Chinese) ［7］朱英辉,刘志璋.升、阻力混合型垂直轴风力机结构与性能的分析［J］.华东电力,2008,36(7):99-101.Zhu Yinghui,Liu Zhizhang.Structure and performance analysis for hybrid vertical axis wind turbines with lift and resistance leaves［J］.East China Electric Power,2008,36(7):99-101.(in Chinese) ［8］何宗敬.DarrieusSavonius组合风轮几何尺寸确定方法的探讨［J］.太阳能学报,1993,14(4):325-329.He Zongjing.On geometric sizes of DarrieusSavonius combined wind turbine［J］.Acta Energiae Solaris Sinica,1993,14(4):325-329.(in Chinese) ［9］Islam M,Ting D S K,Fartaj A.Aerodynamic models for Darrieustype straightbladed vertical axis wind turbines［J］.Renewable and Sustainable Energy Reviews,2008,12(4):1087-1109.
