海上湿空气翼型气动性能分析

为显示湿空气条件下的翼型特性及提供可选择的求解方法,采用计算流体力学方法研究湿空气条件下翼型周围流场及气动特性。将湿空气看作干空气和小液滴的混合气体,使用两相离散模型求解Re=2×106和Re=3×106下不可压缩空气流场翼型特性。对比了两种攻角下不同湿度空气和干空气的升阻力系数,结果显示湿空气对翼型气动性能有影响。湿空气升力系数较干空气要小,阻力系数较干空气大。升力系数随湿度增大减小,阻力系数随湿度增大而增大。通过流场及边界层流动分析发现,湿气促使流动提前分离。

The influence of moist air on airfoil aerodynamic performance

In order to show the characteristics of the airfoil in moist air and provide a solution method, the flow field and aerodynamic characteristics of the airfoil are studied by using the computational fluid method. The moist air is considered as a mixture of dry air and small droplets. The two phase discrete model is used to solve the flow at Re=2× 10₆ and Re=3×10₆. Comparison of the drag and lift coefficient of moist air and dry air at two kind of angles of attack. The results show that the moist air has an effect on the aerodynamic performance of the airfoil. The moist air lift coefficient is smaller than that of dry air, and the drag coefficient is larger than that of dry air. The lift coefficient decreases with the increase of humidity, and the drag coefficient increases with the increase of humidity. Through the analysis of flow field and boundary layer flow, the moisture promotes the separation of flow in advance.