Compressor diffuser with plasma actuators

A stall control system for controlling stall of a centrifugal compressor of a gas turbine engine, the centrifugal compressor having an impeller and a diffuser downstream of the impeller, the stall control system comprising:

• plasma actuators located in boundary layer regions in vicinity of walls bounding respective flow passages of the diffuser, the plasma actuators located closer to inlets than outlets of the respective flow passages, the plasma actuators having a dielectric layer between first and second electrodes, the first electrodes being located upstream of the second electrodes, the first electrodes being exposed to the respective flow passages, the second electrodes being shielded from the respective flow passages by the dielectric layer, the plasma actuators operable to generate electric fields through the dielectric layer;
• and
• a controller operatively connected to the plasma actuators, the controller having a processor and a computer readable medium operatively connected to the processor, the computer readable medium having instructions stored thereon for:
• detecting an impending stall situation of the centrifugal compressor, and
• activating the plasma actuators for generating electric fields between first and second electrodes of the respective plasma actuators.