A Review on Recent Advancements in Rotating Stall and its Control in Axial Flow Compressors

Syed Nabeel Amjad, Ali Sarosh

Abstract


Rotating stall is one of the most common instability phenomenon affecting axial flow compressors. Its characteristics and controls are some of the key researched areas in aeroengine designs. This paper mainly aims to present a survey of the recent research and development works carried out for investigating the rotating stall phenomenon, controlling the conditions that cause the phenomenon and techniques to increase flow stabilization that in turn helps in increasing the compressor efficiency and stability margins. The research literature of last 10-12 years on the subject has mainly been reviewed. This research has been specifically focused on spike initiated rotating stalls. For a more comprehensive understanding of the phenomenon, the blade flow structure, the flow instabilities and tip clearance effects have also been presented. The performances as well as the structural issues caused due to rotating stall have also been compiled. A detailed survey of the research literature on numerical simulations has also been presented that explains the stall and surge conditions in discrete flow environment. It has also been highlighted that the rotating stall leads to a more severe phenomenon of surge that degrades the overall engine performance. In the end the best possible numerical simulation technique to analyse the rotating stall has been recommended. Furthermore, different flow stabilization and rotating stall control techniques and devices have also been recommended.


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