Stabilizing mechanism of shallow circumferential grooves on a high loaded transonic axial-flow compressor

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.