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Experimental Study on Extinction Behavior in Buoyancy-minimized Counterflow Diffusion Flame  

Chung, Yong Ho (부경대학교 에너지시스템공학과)
Park, Jeong (부경대학교 기계공학과)
Kwon, Oh Boong (부경대학교 기계공학과)
Yun, Jin-Han (한국 기계연구원 그린환경에너지기계본부)
Kee, Sang-In (한국 기계연구원 그린환경에너지기계본부)
Kim, Young Ju (한국전력연구원 수화력발전팀)
Publication Information
Journal of the Korean Society of Combustion / v.17, no.4, 2012 , pp. 38-43 More about this Journal
Experimental study was conducted to elucidate flame extinction phenomena in counterflow flame. Using a curtain helium flow significantly reduced buoyancy such that the flame can be positioned at the center between the upper and lower nozzles even at the velocity ratio of 1.0. The curves of critical diluent mole fraction versus global strain rate have C-shapes. The flame oscillation was observed prior to low strain rate flame extinction at both flame conditions with and without minimizing buoyancy force. The results show that, at low strain rate flame, the self-excitation frequency with the order of 1.0 Hz in the case of utilizing pure helium gradually decreases in increase of $N_2$ mole fraction in the curtain flow, meaning that buoyancy suppresses the self-excitation of the outer edge flame.
Curtain flow; Buoyancy; Flame oscillation; Heat loss; Lewis number;
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