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저신장율 대향류확산화염에서 화염소화 및 화염진동에 관한 연구
박정(Jeong Park),박대근(Dae Geun Park),윤진환(Jin Han Yun),길상인(Sang In Keel) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Experimental and numerical studies have been conducted on the characteristics of flame extinction and flame oscillation at low-strain-rate counterflow non-premixed flames diluted with nitrogen. The studies have been conducted varying burner diameter, velocity ratio, and global strain rate. The behaviors of flame extinction diluted with nitrogen indicates C-curves. With finite burner diameter, low-strain-rate flame extinctions are mainly attributed by radial conduction heat loss rather than radiative heat loss. The flame extinction mode in low and high strain rate flames is group into three in studied flame ranges; shrinking flame-disks with and without flame oscillation at low-strain-flames and flame hole (or flame stripe) at high-strain-rate flames. The flame extinction conditions for flame hole or flame stripe do not coincide with those at turning points. The extinction characteristics at low-strain-rate flames are extended to higher strain rates over turning points due to radial conduction heat loss for finite-burner-diameter flames.
부력의 효과를 최소화한 메탄-공기 비예혼합 화염의 화염소화
반규호(Gyu Ho Ban),정용호(Yong Ho Chung),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진환(Jin Han Yun),길상인(Sang In Keel),김영주(Young Ju Kim) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
Experiments were conducted to clarify the role of the outermost edge flame in low-strain-rate flame extinction in buoyancy-suppressed non-premixed methane flames diluted with He and N2.The use of He curtain flow produced a microgravity level of 10-2?10-3g in N2? and He-diluted non-premixed counterflow flame experiments. The critical He and N2 mole fraction at extinction with a global strain rate was examined at various burner diameters (10, 20 , and 25mm). The results showed that the extinction curves differed appreciably with burner diameter. Before the turning point along the extinction curve, low-strain-rate flames were extinguished via shrinkage of the outermost edge flame with and without self-excitation. High-strain-rate flames were extinguished via a flame hole while the outermost edge flame was stationary.