翼型尾缘开口对风力机叶片气动特性的影响

Influence of aerodynamic performance on airfoil opening trailing edge of wind turbine blades

基于工程应用中翼型尾缘开口对风力机叶片气动特性的影响,文章建立了6.7 MW水平轴风力机动力学模型,采用CFD和BEM联合仿真的方法探究了翼型尾缘开口为0,0.1%c,0.3%c,0.5%c时对风力机叶片气动特性的影响。结果表明:随着尾缘开口的增加,翼型的升力系数、升阻比具有一定程度的增加;阻力系数在失速前几乎不变,失速后略微变化;翼型发生失速的角度为12°,不同开口翼型失速分离点的位置略向后缘移动。此外,在3-D湍流风作用下,大型叶片变形和轴向力均略微增大,发电量最大增加了0.88%。

Based on the practical problems,a dynamic model of 6.7 MW wind turbine was established,and the influence of opening trailing edge of 0,0.1%c,0.3%c,0.5%c on blade aerodynamics was investigated by CFD and BEM.The result shows that the lift coefficient and lift-drag ratio of the airfoil significantly increase with the increase of the opening trailing edge;the drag coefficient is almost unchanged before stall,but slightly changed after stall;the stall angle of the airfoil is 12°and the position of the stall separation point of the airfoil moves slightly backward.Otherwise,under the influence of turbulent wind,the blade deformation and axial force increased slightly,and the maximum power generation increased by 0.88%.