Based on Moore-Greitzer model

a two-dimensional incompressible model was developed to predict the post stall transient and effects of nonuniform inlet flow on flow stability of compression systems

and calculations were presented in detail to predict the post stall transient behavior and the onset of flow instabilities in axial compression systems with rotating inlet total pressure distortion.It's found that both the inlet distortion amplitude and rotating frequency have a strong effect on the stability and post stall transient behavior

and the rotating frequency has the same strong influence on the onset of surge as the influence on the onset of rotating stall.But the resonant response frequency strongly depends on the frequency at which the stall cell rotates.