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利用商用CFD软件和S-A湍流模型,对风力机常用的NREL S809翼型在不同覆冰形态、覆冰厚度下的静态流场和动态流场进行了数值计算,得到了Re=1×106时各种覆冰情况下该翼型的气动性能,并研究了不同的覆冰形态对风力机翼型静态、动态失速特性的影响.结果表明:向吸力面生长的覆冰形态会造成覆冰层后的分离涡,随着攻角的增加分离涡向后缘生长,造成升力系数的较大下降,阻力系数增加;沿弦向生长的覆冰对尾缘分离涡的生成影响较小;在动态失速情况下,翼型周围流场比较复杂,覆冰形态对翼型升力系统的影响规律也较复杂;从静态流场特性分析,覆冰破坏了翼型的流线从而直接影响了翼型的气动性能;从动态流场特性分析,覆冰改变了翼型动态升力系数曲线的斜率从而影响到风力机的气动弹性稳定性.
By using commercial CFD software and SA turbulence model, the static flow field and dynamic flow field of NREL S809 airfoil commonly used in wind turbines under different icing conditions and icing thickness are numerically calculated. When Re = 1 × 106 The aerodynamic performance of the airfoil with icing is studied, and the effect of different icing configurations on the static and dynamic stall characteristics of the airfoil is studied. The results show that the icing condition Of the separation vortex, with the increase of the angle of attack, the separation vortex grows to the trailing edge, resulting in a large decrease of the lift coefficient and an increase of the drag coefficient; the icing that grows along the chord has little effect on the generation of the tail vortex separation; In the case of the airfoil, the flow field around the airfoil is rather complicated, and the influence of the icing shape on the airfoil lift system is also complex. From the analysis of the static flow field, ice damage to the airfoil affects the airfoil aerodynamics From the analysis of dynamic flow field characteristics, ice coating changed the slope of dynamic lift coefficient curve of airfoil, which affected the aeroelastic stability of wind turbine.