不同尾缘改型方式对风力机钝尾缘翼型气动性能的影响

AERODYNAMIC INFLUENCE OF DIFFERENT TRAILING-EDGE CHANGING METHODS TO THE BLUNT BRAILING-EDGE AIRFOIL

目前风力机钝尾缘翼型改型方式研究不足,据此本文提出三种钝尾缘改型方式并用Xfoil进行了系列计算: (1)改变中弧线两侧的厚度分配比例;(2)改变厚度分布曲线;(3)刚性旋转上下弧线。用第二种方法研究了NREL的S814翼型,此种方法对钝尾缘改型厚的升力系数影响不大,但对阻力系数产生了一些有利影响;其余两种方法研究了NREL的S815翼型,发现改变厚度分配比例可以使工作区发生移动,而刚性旋转上下弧线同样具有提高升力系数的优点。各种增加尾缘厚度的方式都有使工作区偏移的特点。

Recently, there are only few methods to blunt the wind turbine airfoil trailing-edges in the world, therefore, three kinds of blunt trailing-edge airfoil design methods was presented and calculated by Xfoil. They are （1） changing the distribution of bluntness besides the camber, （2） changing the blending curve, （3） rotting the up/down curve of the airfoil. The airfoil NREL S814 was changed with the second method, and the result shows that different blending curves can hardly influent the lift but the drag if not few. The other methods were used on NREL S814 with the calculations indicate that they can move the working region towards left and increase maximum lift.