AM06-23-005 ダンピングファクターによる振動燃焼制御効果の評価について(燃焼・反応流(1),一般講演)

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This paper describes applications of the damping-factor analysis to the wall-pressure spectra of a lean-premixed combustor. The analysis is applied to a range of operating conditions, which lead to self-excited strong pressure oscillations. By comparing the damping-factor values among the first spectral peaks of different measurement positions and equivalence ratios, possible applications of the analysis as a combustion monitoring tool are discussed. The analysis is applied to the pressure spectra in the actively controlled cases also. A series of active control experiments was previously conducted by means of secondary fuel injection. Keeping the inlet air temperature, the air mass flow rate and the overall equivalence ratio, respectively, at 700K, 78g/s and 0.50, different secondary fuel percentages were examined. The control performance is evaluated by the change of damping-factor values from the steady injection cases to the actively modulated injection cases. The prospects and reminders for the use of the analysis are summarized.
2006-09-05