翼吊布局民机发动机短舱位置优化研究

利用CFD的方法,对某民机进行短舱安装位置的优化分析。在对全机进行粘性绕流数值模拟的基础上,分析了前伸量和下沉量变化对机翼附近流场的干扰以及对全机气动性能的影响。短舱安装位置的优化选择在以巡航状态高升阻比为主要目标的同时,兼顾低速状态气动特性,分析计算了短舱位置变化对低速翼面流动分离特征的影响。计算分析结果表明：在所选的状态内,短舱前移和下移会降低高速状态的干扰阻力,并增加低速状态内侧翼面分离趋势,得出的规律性结论对工程应用具有一定的指导意义。

Nacelle positioning analysis and design for civil aircrafts with underwing engines

In this work,CFD tools are used to analyze the nacelles position of the the civil aircraft.After calculating the flow fields of the civil aircraft with nacelles of different position,we analyze the interference between wings and nacelle-pylon boundary layer resulting from the nacelle position,which is changed both horizontally and vertically.In this process,both the flow separation property on the wing in low-speed condition and the lift-drag ratio in cruise condition are researched.Finally,the relation bet...