降雨对风力机翼型气动性能的影响

Effect of Rainfall on Aerodynamic Performance of Wind Turbine Airfoil

以NACA0012翼型为研究对象,采用拉格朗日离散相模型,研究在不同浓度雨滴下翼型气动性能的影响。研究发现:在降雨环境下,翼型表面会形成一定厚度的液膜,液膜的形成影响翼型表面的光洁度,引起边界层的提前转捩,造成翼型升力减小,阻力增大;翼型表面液膜随着计算时间的推移,翼型的压力面,主要是由于雨滴直接与翼型壁面发生碰撞而形成;翼型的吸力面,主要是由翼型前缘形成液膜后,再逐渐向尾缘流动而形成;当雨滴的浓度增大时,翼型表面形成液膜高度的波动更大,对于其升阻力的影响也将增大。

In this paper,NACA 0012 airfoil is taken as the research object,and the effect of raindrops on airfoil aerodynamic performance is studied by using Lagrange discrete phase model.It is found that a liquid film of a certain thickness is formed on the surface of airfoil under rainfall environment.The formation of liquid film affects the smoothness of the airfoil surface and causes transition in advance of boundary layer,which results in the decrease of lift force and the increase of resistance of airfoil.As the calculation time goes on,the liquid film on the airfoil surface is mainly formed by raindrops colliding directly with the airfoil wall on the pressure surface,while on the suction surface,the liquid film is mainly formed by the leading edge of the airfoil and then flows gradually to the trailing edge.When the concentration of raindrops increases,the height of liquid film formed on the airfoil surface fluctuates more,and the influence on its lifting resistance will also increase.