Savonius风力机叶片弧度的数值模拟研究
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摘要
为研究Savonius风力机的叶片弧度对其功率性能的影响,建立Savonius风力机的二维有限元分析模型,应用FLUENT进行数值模拟计算。计算基于RNG k-ε湍流模型,采用滑移网格技术实现风力机的转动。研究了叶片弧度从(140～180)°范围的风力机在不同尖速比下的平均力矩系数与平均功率系数,通过比较最大平均功率系数来确定叶片弧度的最优值。数值模拟的结果表明:叶片弧度越小,Savonius风力机受到的阻力矩越大,其平均力矩系数和平均功率系数就越低,即功率性能越差;叶片弧度在180°时,Savonius风力机功率性能最优。
In order to study the influence of blade radian on the power performance of Savonius wind turbine,the two-dimensional finite element analysis model of wind turbine was establishedand the numerical simulation was carried out by using FLUENT. The calculation was based on RNG k-ε epsilon model,using the sliding mesh to reach the rotation of wind turbine.The averaged torque coefficient and averaged power coefficient of wind turbines whose blade radian ranging from(140～180)°under different speed ratio was studied. By comparing the maximum averaged power coefficient to detect the optimal blade radian. The numerical simulation results show that the smaller blade radian is,the bigger resistance torque of wind turbine is,leading to smaller averaged torque coefficientand power coefficient of wind turbine. When the blade radian is 180°,the power performance is the best.
In order to study the influence of blade radian on the power performance of Savonius wind turbine,the two-dimensional finite element analysis model of wind turbine was establishedand the numerical simulation was carried out by using FLUENT. The calculation was based on RNG k-ε epsilon model,using the sliding mesh to reach the rotation of wind turbine.The averaged torque coefficient and averaged power coefficient of wind turbines whose blade radian ranging from(140～180)°under different speed ratio was studied. By comparing the maximum averaged power coefficient to detect the optimal blade radian. The numerical simulation results show that the smaller blade radian is,the bigger resistance torque of wind turbine is,leading to smaller averaged torque coefficientand power coefficient of wind turbine. When the blade radian is 180°,the power performance is the best.
引文
[1]赵知辛,王方成,刘二乐.风力机叶轮设计与有限元特性分析[J].机械设计与制造,2014,31(5):226-229.(Zhao Zhi-xin,Wang Fang-cheng,Liu Er-le.Wind turbine impeller design and finite element analysis[J].Machinery Design&Manufacture,2014,31(5):226-229.)
[2]赵振宙,郑源,徐小韵.螺旋形S型垂直轴风轮结构优化设计[J].中国机电工程学报,2009,29(26):75-78.(Zhao Zhen-zhou,Zheng Yuan,Xu Xiao-yun.Optimum figuration of helix S-type vertical axis wind tubine[J].Proceedings of the CSEE,2009,29(26):75-78.)
[3]赵振宙,郑源,周大庆.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 Zhen-zhou,Zheng Yuan,Zhou Da-qing.Performance optimization of Savonius wind turbine based on numerical simulation[J].ActaEnergiae Solaris Sinica,2010,31(7):907-911.)
[4]Blackwell B,Sheldahl R,Feltz L.Wind tunnel performance data for twoand-three-bucket Savonius rotors,SAND76-0131[R].New Mexico:US Sandia Laboratories,1977.
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[7]Golecha K,Eldho T,Prabhu S.Influence of the deflector plate on the performance of modified Savonius water turbine[J].Applied Energy,2011,88(9):3207-3217.
[8]Altan B,Atilgan M.An experimental and numerical study on the improvement of the performance of Savonius wind rotor[J].Energy Conversion and Management,2008,49(12):3425-3432.
[9]Altan B,Atilgan M.An experimental study on improvement of a Savonius rotor performance with curtaining[J].Experimental Thermal and Fluid Science,2008,32(8):1673-1678.
[10]田文龙,宋保维,毛昭勇.椭圆叶片Savonius风力机叶轮气动性能数值计算[J].中国机电工程学报,2014,34(32):5796-5802.(Tian Wen-long,Song Bao-wei,Mao Zhao-yong.Numerical investigation of A savonius wind turbine with elliptical blades[J].Proceedings of the CSEE,2014,34(32):5796-5802.)
[2]赵振宙,郑源,徐小韵.螺旋形S型垂直轴风轮结构优化设计[J].中国机电工程学报,2009,29(26):75-78.(Zhao Zhen-zhou,Zheng Yuan,Xu Xiao-yun.Optimum figuration of helix S-type vertical axis wind tubine[J].Proceedings of the CSEE,2009,29(26):75-78.)
[3]赵振宙,郑源,周大庆.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 Zhen-zhou,Zheng Yuan,Zhou Da-qing.Performance optimization of Savonius wind turbine based on numerical simulation[J].ActaEnergiae Solaris Sinica,2010,31(7):907-911.)
[4]Blackwell B,Sheldahl R,Feltz L.Wind tunnel performance data for twoand-three-bucket Savonius rotors,SAND76-0131[R].New Mexico:US Sandia Laboratories,1977.
[5]Akwa J,Junior G,Petry A.Discussion on the verification of the overlap ratio influence on performance coefficients of a Savonius wind rotor using computational fluid dynamics[J].Renewable Energy,2012,38(1):141-149.
[6]Saha U,Thotla S,Maity D.Optimum design configuration of Savonius rotor through wind tunnel experiments[J].Journal of Water Engineering and Industrial Aerodynamics,2008,96(8-9):1359-1375.
[7]Golecha K,Eldho T,Prabhu S.Influence of the deflector plate on the performance of modified Savonius water turbine[J].Applied Energy,2011,88(9):3207-3217.
[8]Altan B,Atilgan M.An experimental and numerical study on the improvement of the performance of Savonius wind rotor[J].Energy Conversion and Management,2008,49(12):3425-3432.
[9]Altan B,Atilgan M.An experimental study on improvement of a Savonius rotor performance with curtaining[J].Experimental Thermal and Fluid Science,2008,32(8):1673-1678.
[10]田文龙,宋保维,毛昭勇.椭圆叶片Savonius风力机叶轮气动性能数值计算[J].中国机电工程学报,2014,34(32):5796-5802.(Tian Wen-long,Song Bao-wei,Mao Zhao-yong.Numerical investigation of A savonius wind turbine with elliptical blades[J].Proceedings of the CSEE,2014,34(32):5796-5802.)