Active control of combustion instability

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(87)90109-X· OSTI ID:5551041

Lang, W; Poinsot, T; Candel, S

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 stabilization. Finally, a simple model describing the effects of the AIC system is developed and its results compared to the experiment.

• Research Organization: Institute B fur Thermodynamik, Technische Universitat, Munich
• OSTI ID: 5551041
• Journal Information: Combust. Flame; (United States), Vol. 70:3
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMBUSTORS
COMBUSTION INSTABILITY
DAMPING
ACOUSTIC TESTING
BURNERS
COMBUSTION CONTROL
COMBUSTION KINETICS
ENERGY EFFICIENCY
FLAME PROPAGATION
MATHEMATICAL MODELS
OPERATION
SOUND WAVES
CHEMICAL REACTION KINETICS
CONTROL
EFFICIENCY
INSTABILITY
KINETICS
MATERIALS TESTING
NONDESTRUCTIVE TESTING
REACTION KINETICS
TESTING
421000* - Engineering- Combustion Systems