Design of Active Control System for Combustion Instability Using H sub(2) Algorithm

Design of active control system for combustion instability using H super(2) algorithm is presented. This study shows the performance of Active Combustion Control (ACC) system using a loudspeaker with the concept of the Active Noise Control (ANC) principle. The approach is based on the coupling effect between acoustic waves and unsteady heat release. The oscillatory flames are examined at first with the frequency analysis and laser diagnostics of Planar Laser-Induced Fluorescence (PLIF). A modern H super(2) control algorithm based on the experimental modal analysis for the system identification is applied to control the oscillatory flames. The OH radical distribution near the region of the flame holder is visualized, and distinctive flames with different remarkable frequencies are observed. It is proved that the developed H super(2) controller using a loudspeaker actuator performed very well, resulting in an enhancement of the combustion noise suppression.