Savonius风力机叶片弧度的数值模拟研究

Research on Numerical Simulation of the Savonius Wind Turbine Blade Radian

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-dimen- sional 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.