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Active control of combustion instability

: Lang, W.; Poinsot, T.; Candel, S.

Combustion and Flame (1987), S.281-289
ISSN: 0010-2180
Fraunhofer IFT; 2000 dem IZM eingegliedert
active control; combustion instability

The principle of 'antisound' is used to construct a method for the suppression of combustion instabilities. This active instability control (AIC) method uses external acoustic excitation by a loudspeaker to suppress the oscillations of a flame. The excitation signal is provided by a microphone located upstream of the flame. This signal is filtered, processed, amplified, and sent to the loudspeaker. The AIC method is validated on a laboratory combustor. It allows the suppression of all unstable modes of the burner for any operating ratio. The influence of the microphone and loudspeaker locations on the performance of the AIC system is described. For a given configuration, domains of stability, i.e. domains where the AIC system parameters provide suppression of the oscillation, are investigated. Measurements of the electric input of the loudspeaker show that the energy consumption of the AIC system is almost negligible and suggest that this method could be used for industrial combustor s tabilization. Finally, a simple model describing the effects of the AIC system is developed and its results compared to be experiment. (IFT)