Investigation on active control of rotating stall in axial flow compressors via bifurcation theory

Rotating stall is a fundamental aerodynamic instability phenomenon of axial flow compressors.Firstly,the results of nonlinear dynamic bifurcation analysis on Moore-Greitzer compression system model showed that rotating stall was induced by subsonic pitchfork bifurcation;secondly,an active nonlinear feedback control law was proposed which using compressor pressure ratio as input measuring signal and throttle valve position as output actuating signal;Finally,computer simulation in bifurcation software AUTO was carried,and the simulation results showed that the proposed active nonlinear feedback control law translated the pitchfork bifurcation from subsonic to supersonic,which could eliminate the hysteresis loop associated with rotating stall and extend the stable operating range of axial flow compressors.Moreover,the proposed control system only used 1-dimensional sensor and actuator,so it could be easily applied in the engineering field.