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Environmental Engineering Research 2004;9(6): 256-268. DOI: https://doi.org/10.4491/eer.2004.9.6.256
COMBUSTION CONTROL OF SELF-EXCITED COMBUSTION OSCILLATION AND NOx REDUCTION BY FORCED PULSATING MIXTURE SUPPLY
Young-Joon Yang, and Fumiteru Akamatsu
Department of Mechanical Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
Corresponding Author: Young-Joon Yang ,Tel: +82-051-200-6985, Fax: +82-051-200-7656, Email: yangyj-du@hanmail.net
Received: June 10, 2004;  Accepted: October 6, 2004.
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ABSTRACT
An idea to suppress the self-excited combustion oscillation was applied to confined premixed flames stabilized by a rearward-facing step. The characteristics of unsteady combustion driven by forced pulsating mixture supply that can modulate its amplitude and frequency were examined. The self-excited combustion oscillation having weaker flow velocity fluctuation intensity than that of the forced pulsating supply can be suppressed by the method. The effects of the amplitude and frequency of forced pulsating mixture supply on controlling the self-excited combustion oscillations were also investigated comparing with the steady mixture supply. The unsteady combustion used in the present experiment plays an important role in controlling self-excited combustion oscillations, and it also exhibits desirable performances, from a practical point of view, such as high combustion load and reduced pollutant emissions of NOx.
Keywords: Flame | Combustion Oscillation | Combustion Control | Forced Pulsating Mixture Supply | NOx
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