Geometric characteristics for blade aerofoils during fan design, superposed aerofoils by analytic method, and the method to set up aerofoil circumference equation method are described.

阐述了风机设计中叶片翼型的几何特性、用解析方法叠加翼型，以及建立翼型周线方程的方法。

The most popular design methods of the axial fan are the Single Aerofoil Method and the Cascade Method.

其工程上的设计方法比较单一，普遍采用的方法是孤立叶型法和叶栅法。