核心机驱动风扇级气动特性及静子方案研究

Reserch on Aerodynamic Features of Core Driven Fan Stage and Stator Scheme

核心机驱动风扇级(CDFS)是实现变循环发动机宽涵道比调节的关键部件之一,其在不同工作模式下出口气流角差异较大,造成CDFS与下游部件匹配困难。针对这一问题设计在CDFS转子后增设一排小弯角静子叶片的方案,优化CDFS与下游部件的匹配效果。使用NUMECA中的AutoGrid5软件包对CDFS进行网格划分和仿真计算。计算结果表明:在转子后增加静子会降低CDFS的效率,但能提高CDFS的稳定裕度,双涵道模式下小弯角静子方案的稳定裕度相对无静子方案提高4.4个百分点,且压比、效率均高于常规静子方案,是一种性能较优的CDFS静子方案。

As core driven fan stage(CDFS)is one of the key components to realize the width and bypass ratio regulation of variable cycle engine,its outlet flow angle varies greatly under different working modes,making it difficult to match CDFS with downstream components.To solve this problem,a row of small Angle stator is designed to add behind the CDFS rotor to optimize the matching effect between CDFS and downstream components.The calculation results show that the addition of stator scheme behind the rotor will reduce the efficiency of CDFS,but can improve the stability margin of CDFS.The stability margin of the small angle stator scheme under the double bypass mode is 4.4 per cent higher than that of the scheme without stator scheme,and the pressure ratio and efficiency are higher than the conventional stator scheme:a CDFS stator scheme with better performance.