风力机翼型同相对厚度条件下的气动性能模拟分析

Analysis of Aerodynamic Performance of Wind Turbine Airfoil under the Same Relative Thickness

针对翼型气动性能优劣将直接影响风力机使用过程中的效率问题,选取3种具有相同相对厚度(相对厚度为21%)而形状不同的常用风力机翼型NACA0021、NACA63421和S809进行二维建模和网格划分,对比3种翼型形状上的差异,并利用Fluent取雷诺数为5.5×105时对其空气动力学性能进行数值模拟和分析,获得了不同攻角下3种翼型的升阻力系数和升阻比,并与试验数据进行对比验证。结果表明,3种风力机翼型中,在相同相对厚度、较低雷诺数条件下,具备一定弯度的风力机翼型NACA63421的气动性能优于其他2种,为风力机叶片翼型选型与改型设计提供了参考。

The aerodynamic performance of airfoils influences the efficiency of the wind turbine generator directly.Three different kinds of airfoils with the same 21 percent relative thickness and different shapes,that is NACA0021,NACA63421 and NREL-S809,are chosen to establish 2D model and partition mesh.Compared with difference of airfoil shapes,Fluent software is applied to simulate the aerodynamic performance of the airfoils when the Renald number is given 5.5×10^5.Then comparison of the experimental data,lift-resistance coefficients and its ratio of airfoils are obtained under the different angles of attack.The results show that the aerodynamic performance of the bent blade NACA63421 is better than those of other blades under the conditions of the same relative thickness and the lower Reynolds number,which provides references for selection and design airfoils of wind turbine blade.