风力机叶片翼型的气动特性研究

选取S818叶片翼型进行二维几何模型,采用适合翼型流动的Spalart-Allmaras湍流模型,对Base翼型和95%弦长处带Microtab的翼型进行数值模拟分析,得到在不同攻角下的升阻比、表面压力和速度矢量图。从流场计算结果看出95%弦长处带microtab的翼型在0°到12°攻角范围内气动性能有明显提高;带microtab的翼型改变了后驻点位置,使其出现在了microtab末端,增加了气动曲面环量,从而增加了翼型升力。

Study on Aerodynamic Characteristic of Blade Aerofoil of Wind Turbine

The blade airfoil of S818 was selected to establish two-dimensional geometry model,choosing the Spalart-Allmaras turbulence model which suit to airfoil flow for numerical simulation analysis of the Base airfoil and the airfoil with microtab at95% chord. It obtains the lift-drag ratio in different Angle of attack、surface pressure and velocity vector diagram. From the flow field calculation result we can get that the aerodynamic performance has increased obviously between 0° and 12° at the airfoil with microtab at 95% chord; The airfoil with microtab change the rear stagnation point position which efficiently increased aerodynamical circulation,thereby enhancing the airfoil lift.