부력 효과의 최소화를 통한 소화 근처 대향류 확산화염 거동에 관한 실험적 연구 = Experimental Study on Behavior near Extinction in Buoyancy-minimized Counterflow Diffusion Flame

다국어 초록 (Multilingual Abstract)

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 N2 mole fraction in the curtain flow, meaning that buoyancy suppresses the self-excitation of the outer edge flame.