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H2-공기와 CO-공기의 예혼합화염의 화염소화에 있어서 화학적 상호작용의 효과

Effect of Chemical interaction on Flame Extinction in Interacting H2-air and CO-air Premixed Flames

박정|권오붕|길상인|윤진한|정승욱
한국연소학회 (The Korean Society Of Combustion)|2013.12|한국연소학회지 (Journal of The Korean Society of Combustion)|제18권 제4호|pp. 44-52

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참고문헌

키워드

Lewis numberDownstream interactionChemical interactionFlame stability map

초록

Important role of chemical interaction in flame extinction was numerically investigated in downstream interaction among lean(rich) and lean (rich) premixed as well as partially premixed H2-air and CO-air flames. The strain rate varied from 30 to 5917s-1 until interacting flame could not be sustained anymore. Flame stability diagrams mapping lower and upper limit fuel concentrations for flame extinction as a function of strain rate are presented. Highly stretched interacting flames were survived only within two islands in the flame stability map where partially premixed mixture consisted of rich H2-air flame, extremely lean CO-air flame, and a diffusion flame. Further increase in strain rate finally converges to two points. Appreciable amount of hydrogen in the side of lean H2-air flame also oxidized the CO penetrated from CO-air flame, and this reduced flame speed of the H2-air flame, leading to flame extinction. At extremely high strain rates, interacting flames were survived only by a partially premixed flame such that it consisted of a very rich H2-air flame, an extremely lean CO-air flame, and a diffusion flame. In such a situation, both the weaker H2-air and CO-air flames were parasite on the stronger diffusion flame such that it could lead to flame extinction in the situation of weakening the stronger diffusion flame. Particular concerns are focused on important role of chemical interaction in flame extinction was also discussed in detail.

Abstract

Important role of chemical interaction in flame extinction was numerically investigated in downstream interaction among lean(rich) and lean (rich) premixed as well as partially premixed H2-air and CO-air flames. The strain rate varied from 30 to 5917s-1 until interacting flame could not be sustained anymore. Flame stability diagrams mapping lower and upper limit fuel concentrations for flame extinction as a function of strain rate are presented. Highly stretched interacting flames were survived only within two islands in the flame stability map where partially premixed mixture consisted of rich H2-air flame, extremely lean CO-air flame, and a diffusion flame. Further increase in strain rate finally converges to two points. Appreciable amount of hydrogen in the side of lean H2-air flame also oxidized the CO penetrated from CO-air flame, and this reduced flame speed of the H2-air flame, leading to flame extinction. At extremely high strain rates, interacting flames were survived only by a partially premixed flame such that it consisted of a very rich H2-air flame, an extremely lean CO-air flame, and a diffusion flame. In such a situation, both the weaker H2-air and CO-air flames were parasite on the stronger diffusion flame such that it could lead to flame extinction in the situation of weakening the stronger diffusion flame. Particular concerns are focused on important role of chemical interaction in flame extinction was also discussed in detail.

참고문헌 (26)

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상호작용 하는 H2-공기/CO-공기 예혼합화염에 미치는 H2 선호 확산 영향에 대한 수치적 연구박정, 권오붕, 길상인, 윤진한, 정용호한국연소학회 · 한국연소학회지2013 · 제18권 제4호상호작용하는 H-CO 예혼합 화염에서 H선호확산의 영향에 관한 수치적 연구박정, 권오붕, 오상훈한국연소학회 · 한국연소학회지2012 · 제17권 제3호H2-공기와 CO-공기 예혼합화염 사이의 후류상호작용에 있어서 CO2 첨가 효과박정, 길상인한국연소학회 · 한국연소학회지2013 · 제18권 제4호H2-공기와 CO-공기 예혼합 화염 사이의 후류상호작용에 있어서 H2O 첨가 효과박정, 권오봉, 김태형, 박종호한국연소학회 · 한국연소학회지2015 · 제20권 제1호메탄-공기/합성가스-공기 예혼합화염의 후류 상호 작용에 대한 연구박정, 권오붕, 길상인, 윤진한한국연소학회 · 한국연소학회지2016 · 제21권 제1호상호작용하는 메탄-수소 예혼합 대향류화염에 관한 연구박정, 권오붕, 김정수, 문창우, 배대석한국연소학회 · 한국연소학회지2010 · 제15권 제1호

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