Effects of rotating disturbance on aerodynamics stability of axial-flow compressor

Experiments were carried out on a two-stage low-speed axial-flow compressor with a newly designed rotating disturbance generator, so as to study the influences of rotating frequency, disturbed sector and the number of disturbed cells on the compressor aerodynamics stability. The experiments show that the compressor experienced significant degradation in its stall margin when the disturbance rotated at the “dangerous frequency”, which didn't change at different disturbed sectors and cells. A two-dimensional incompressible model considering rotating disturbance was developed based on M-G model. This model can calculate the influence of rotating disturbance with different disturbed sectors and cells on the aerodynamic stability and stall process of the compression system. When analyzing by building a mathematical model for the experiment compressor and employing the two-dimensional incompressible model, it was found that the rotating disturbance will induce the modal wave and affect the compression system stall margin more severely if the rotating frequency was close to the rotating stall propagate frequency.