A practical active control system for the mitigation of combustion instability has been designed and demonstrated in a lean, premixed, single-nozzle combustor at realistic engine operating conditions. A full-scale engine fuel nozzle was modified to incorporate a simple fuel flow actuator. Results indicate that the system was capable of reducing pressure fluctuations by 82 percent (15 dB or 5.6×) while maintaining or reducing NOx and CO emissions levels.
Active Control of Combustion Instability in a Liquid-Fueled Low-NOx Combustor
Cohen, J. M., Rey, N. M., Jacobson, C. A., and Anderson, T. J. (April 1, 1999). "Active Control of Combustion Instability in a Liquid-Fueled Low-NOx Combustor." ASME. J. Eng. Gas Turbines Power. April 1999; 121(2): 281–284. https://doi.org/10.1115/1.2817118
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