降雨对翼型气动性能影响的机理研究  

Mechanisms research of rain effects on airfoil aerodynamic performance

作　　者：张瑞民[1] 曹义华[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《飞行力学》2011年第1期70-73,共4页Flight Dynamics

摘　　要：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 an airfoil in rain condition were studied with the Lagrangian discrete phase model in the computational fluid dynamics soft ware FLUENT 6.3.26.The mechanism of rain effects on airfoil aerodynamic performance was also investigated based on modifying the Wilcox transition mode with a UDF（user-defined function）.It is shown that the water film accumulated on airfoil surfaces and the film roughness can influence the smoothness of the airfoil surfaces and induce premature transition.Thus the lift coefficients decrease lightly and the drag coefficients increase;when the airfoil approaches stalling,the water film accumulated on the trailing edge of the upper surface can trigger the advanced separation of boundary airflow and cause the serious aerodynamic penalty.

关 键 词：降雨 翼型 气动性能 机理 水膜层 转捩 分离 

分 类 号：V211.4[航空宇航科学与技术—航空宇航推进理论与工程]