Abstract: In order to understand the flow characteristics in highly loaded stator and guide the stator retrofit design，experimental and numerical methods were adopted for aerodynamic performance analysis of a final stage stator cascade of a highly loaded fan. In order to conduct the sectorial cascade experiment without the existence of moving blades，the adjustable guide vanes (AGV) were designed to simulate the inlet flow velocity and direction of the stator. Aerodynamic performances of the stator cascade under different inlet Mach numbers were analyzed. Results show that the AGV can ensure the stator inlet velocity angle and Mach number are similar to those in stage. Therefore sector cascade experiment can be used to simulate the stage environment to study the stator aerodynamic performance. There is large scale separation on the stator suction surface. The largest scale separation exists at 27% span，which causes the minimum flow turning angle 42° here. The loss of negative attack angle exists at 3% span on the pressure surface. With the increase of inlet Mach number，the fluctuation range of outlet parameters increase significantly along radial direction.

Key words: Stator；Sector cascade；Experiment；Numerical simulation；Aerodynamic performance

摘要： 为了掌握高负荷静叶内部流动特征，进而指导静叶改型设计，采用实验和数值模拟相结合的方法，对高负荷风扇末级静子叶栅的气动性能开展研究。为了在级环境下研究静子叶栅的气动性能，在静子叶栅前设计了导叶，提供级中静子叶栅的进口气流参数，分析了不同进口马赫数条件下的静叶气动性能。研究表明:导流叶片可以保证静叶进口气流方向和速度与级内相近，可以用扇形叶栅吹风实验模拟级环境对静叶气动性能开展研究；静叶吸力面存在较大的分离和回流，27%叶高附近分离最大，使该处气流折转最小约42°；静叶3%叶高压力面存在较大的负攻角损失；随着进口马赫数增加，出口气流参数沿径向波动程度明显增加。

关键词: 静叶；扇形叶栅；实验；数值模拟；气动性能