为了提高某高负荷风扇的性能，针对其末级静子开展改型设计研究。采用串列静子方案改善原型单列静子分离严重、损失大、裕度低的问题，并采用仿真与叶栅试验的方法分析了串列静子前后两排叶片间周向相对位置和轴向相对位置变化对设计状态与非设计状态下叶栅气动特性的影响。结果表明：当串列静子两排叶片周向相对位置为0.7、轴向相对位置为0.065时，风扇具有较高的综合性能；串列静子可有效提高风扇末级性能、拓宽稳定边界，在1.0倍和0.8倍换算转速下，喘振裕度分别提高4.7%和8.6%，设计点效率分别提高1.4%与3.2%。

In order to improve the performance of a highload fan, a retrofit design study was carried out for its last stage stator. The tandem stator scheme was adopted to solve the problems of high loss and low margin caused by severe separation in the prototype singlerow stator. The influence of circumferential and axial relative position changes of two rows of tandem stator blades on the aerodynamic characteristics of cascade in design and offdesign states was analyzed by the method of simulation and cascade experiment. The results shows that when the circumferential relative position of two rows of tandem stator is 07 and the axial relative position is 0065, the fan has higher comprehensive performance; tandem stator can effectively improve the performance and stable boundary of the last stage of the fan. The surge margin increases by 4.7% and 8.6% respectively, and the efficiency of design point increases by 1.4% and 32% respectively at 1.0 and 0.8 converted speed.

V231.3