Rotating Stall Control in Axial Compressor Subject to Wheel Speed Transients

A gain-scheduled controller design methodology for rotating stall control in an axial flow compressor subject to wheel speed transients is presented. Linear robust controllers are designed for a family of flow coefficients in the spatial domain at specified discrete wheel speeds to regulate nonaxisymmetric flow. The resulting family of controllers are then gain scheduled with respect to wheel speed in an effort to address the transient wheel speed condition. To validate the performance of the gain schedule control law, domains of attraction obtained from initial condition simulated responses of the nonlinear compressor model are used.