钝尾缘翼型三维特性研究

INVESTIGATION OF THREE-DIMENSIONAL AERODYNAMIC CHARACTERISTICS OF BLUNT TRAILING EDGE AIRFOIL

采用基于雷诺平均的流体力学计算方法,分别对100 k W钝尾缘风力机、钝尾缘翼型及对应的尖尾缘风力机和翼型进行数值模拟研究,利用反BEM方法从旋转叶片计算结果中获得翼型的三维流场信息。研究结果表明,钝尾缘翼型应用于叶片内侧,其气动性能优于相同厚度的尖尾缘翼型,叶片根部存在明显的展向流动,与旋转导致的边界层方程中的对流项、科氏力项及离心力项直接相关,是造成钝尾缘翼型三维气动特性明显有别于二维的原因,此差异还与翼型展向位置、攻角关系密切。

Based on the Reynolds averaged hydrodynamics calculation method, 100 kW blunt trailing edge wind turbine, blunt trailing edge airfoil and corresponding tip trailing edge wind turbine and airfoil were numerically simulated, respectively. Three-dimensional flow field information of the airfoils was obtained from the rotating blade calculation results by inverse BEM theory. The results show that the aerodynamic characteristics of blunt trailing edge airfoil using at the inboard section of blade are obviously better than tip trailing edge airfoil with same thickness and there is obvious span-wise flow at the blade root, which is directly related to the convective term, the Coriolis force term and the centrifugal force term in the boundary layer equation caused by the rotation, and is the main reason causing the difference between three-dimensional aerodynamic characteristics and two-dimensional aerodynamic characteristics. This difference is also closely related to span-wise position of the airfoil and angle of attack.