中文摘要：

民用飞机性能的提高将在很大程度上依赖于降低空气阻力。在巡航状态下，如果能减小机翼的诱导阻力，则全机的减阻效果将会得到很明显的提高。因此，本文以民用飞机机翼为设计平台，通过加装融合式翼梢小翼来减阻，并在设计了初始小翼的基础上，将减阻作为设计目标，对翼梢小翼的平面几何形状进行优化，并对结果进行了流动机理分析。

英文摘要：

Improving the performance of civil aircraft mainly depends on drag reduction. On the condition of cruise, the efficiency of reducing the whole plane＇s drag will be improved greatly if the induced drag of the wing can be reduced. In this paper, based on the civial aircraft pure wing, winglet is used to reduce the in- duced drag. Besides, the winglet＇s shape is optimized with the objective of reducing drag and the flowing mechanism is analyzed to make preparation for further study of winglet design.