Keynote Title:
Stall Margin Improvement on Axial Compressors: Integrated Design of Axial Slot Casing Treatment and Blades

Abstract:

Casing treatment has been widely studied to extend the stall margin of axial flow compressors. However, a large amount of research has demonstrated that the addition of casing treatment would cause efficiency penalty, which greatly restricted the engineering application of casing treatment in modern aeroengine compressors. The revelation of coupling mechanism and integrated design criteria of casing treatment and blades is a key to fully tap the potential of the stability-enhancing capability of casing treatments on the premise of no efficiency penalty. Recent progress of casing treatment in the open literature will be first summarized. The latest research results on stability mechanism and optimization design of casing treatment made in China will be then introduced. Based on analysis of the integrated design optimization results, the design criteria of axial slot casing treatment and blades are summarized and used as guidance in the design process of tip-critical low-speed and transonic axial compressors. The final result shows the prospects of integrated design in stall margin and efficiency improvement.