Abstract: This paper presents the numeral investigation on stabilizing mechanism of shallow circumferential grooves applied on a high loaded transonic axial-flow compressor in off-design speed. Grooves at different axial positions were combined and studied to find out the stabilizing effect and their corresponding mechanism. The results confirm the effectiveness of shallow grooves that successfully enlarge the operating range of compressor with drop in efficiency less than 1%. The downstream grooves combine their influence on tip-clearance flow and stabilization in a linear manner, and finally change the stall type of the axial compressor. 

Key words: Compressor; Casing treatment; Numerical simulation;Stabilizing mechanism

摘要： 为验证周向浅槽处理机匣的扩稳效果,通过数值仿真的方法,主要探讨了工作于非设计转速下的高负荷轴流压气机上,处于不同轴向位置浅槽式机匣处理及其组合对压气机稳定性的作用。确定了各周向槽于稳定性的主要贡献、机理和处理槽之间的相互影响。研究发现:周向浅槽可以在效率平均下降不到1%的情况下有效地对压气机进行扩稳；通道下游位置的周向槽以线性方式对顶隙泄漏流与扩稳量进行组合影响；另外,通过浅槽的扩稳作用,压气机的失速类型也会发生明显变化。 

关键词: 压气机;机匣处理;数值仿真;稳定机理 