Design of active control system for combustion instability using H2 algorithm Online publication date: Sun, 04-Feb-2007
by Hiroyuki Sato, Chiaki Nishidome, Itsuro Kajiwara, A. Koichi Hayashi
International Journal of Vehicle Design (IJVD), Vol. 43, No. 1/2/3/4, 2007
Abstract: An active control system of oscillatory flame in a swirler combustor was investigated to control flame stability and to reduce the combustion noise. A modern H2 control algorithm based on experimental modal analysis for system identification was applied to develop a closed-loop feedback control system. To examine the exothermic fluctuation, planar laser-induced fluorescence measurements were carried out. The OH radical distribution near the region of the flame holder was visualised. Two types of oscillatory flame were observed in this investigation: one was characterised by low-frequency mode; the other, with high-frequency mode, was produced with a remarkable frequency characterised by resonance of the combustor. As for the closed-loop feedback control system, a loudspeaker and microphone were used as an actuator and a sensor. It was found that the developed control system performed well with the result of 15-dB reduction.
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