某高负荷前掠双级风扇设计与掠形机理研究

Design of a high-loading two-stage forward swept fan and investigation on the swept-blading mechanism

介绍了某高负荷双级前掠风扇的设计方法和设计结果.为改善风扇性能,采用了转子叶尖和静子叶根适度前掠的设计方法.在此设计基础上对前掠和后掠两个单级的三维数值解进行对比研究,认为前掠、后掠所得风扇效率的差别很小,转子通道在三维相对运动中不存在旋向相反的流动形态;前掠明显提高失速裕度的主要原因是转子通道激波曲面按其自身结构的需要而展向发展,它的展向构形和流向平衡位置不完全随叶片前缘形状改变,因此前掠增大了激波与前缘的相对距离.

The design method and the result of a two-stage high-loading forward-swept fan were presented.The design strategies of both rotor tip and stator hub forward-swepts were applied to improve the stage efficiency and stall margin.With this design,3-D steady viscous computational fluid dynamics(CFD) technique was used to discuss the influences of forward and backward-swept rotors on the first-stage fan performance and their reasons.Two facts are found.Firstly,the swept forward and backward blade passages cause a...