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利用计算流体力学软件FLUENT6.3.26中的拉格朗日离散相模型研究了降雨条件下翼型的气动特性变化,并应用UDF(用户自定义函数)对FLUENT中自带的Wilcox转捩模式进行了修正,对降雨对翼型气动性能的影响机理进行了研究。结果表明,在降雨条件下,翼型表面积聚的水膜层及其表面粗糙度会影响翼型表面的光洁度,引起边界层提前转捩,造成升力系数略微减小,阻力系数增加;当翼型接近失速时,聚集在翼型上表面尾缘处的水膜层会触发边界层气流的提前分离,造成翼型气动性能的严重损失。
The aerodynamic characteristics of airfoils under rainfall were studied by using the Lagrange discrete-phase model in computational fluid dynamics software FLUENT 6.3.26 and the Wilcox transition model built in FLUENT was implemented using UDF (user-defined function) Correction, the impact of rainfall on the aerodynamic performance of the airfoil were studied. The results show that under rainfall conditions, the water film layer and its surface roughness which affect the airfoil surface will affect the airfoil surface finish, causing the boundary layer to turn in advance, resulting in a slight decrease of the lift coefficient and an increase of the drag coefficient. Toward the stall, the water layer that collects at the trailing edge of the upper surface of the airfoil will trigger the premature separation of the boundary layer airflow, resulting in serious loss of airfoil aerodynamic performance.