Title: Design of active control system for combustion instability using H² algorithm

Authors: Hiroyuki Sato, Chiaki Nishidome, Itsuro Kajiwara, A. Koichi Hayashi

Addresses: Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan. ' Catec Inc., Okajima Bldg. 4F 5-16-3 Asakusabashi, Taito-ku, Tokyo 111-0053, Japan. ' Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan. ' Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan

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.

Keywords: active control; combustion instability; combustion noise; H² algorithm; oscillatory flame; noise reduction; modal analysis; feedback control; closed-loop control; lean premixed combustion; pollution emission.

DOI: 10.1504/IJVD.2007.012310

International Journal of Vehicle Design, 2007 Vol.43 No.1/2/3/4, pp.322 - 340

Published online: 04 Feb 2007 *

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