화염 상호작용 내 암모니아 부분 크래킹 모사연료의 소화거동 특성
Extinction Behavior Characteristics of Ammonia Partial Cracking Simulated Fuels with Flame Interactions
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The extinction behavior and chemical interaction characteristics of ammonia cracking simulated fuels were investigated in twin counterflow burner with flame interactions. The UCSD mechanism showed the best agreement with the experimental extinction limits under a cracking ratio of 16%. The flame stability map was presented with global strain rate and volumetric fraction of H2 as a major variable. As the strain rate increases, the extinction boundary narrows, and the lean extinction boundary shows a steeper slope and stronger interaction compared to the rich extinction boundary. Under rich conditions, as the strain rate increases, the heat release rate and maximum temperature of the flames decrease leading to extinction. Through flame structure analysis, it is confirmed that the preferential diffusion of H and H2 occurs under lean extinction limit conditions, and the consumption reaction of HNO becomes more active, leading to a chain-terminating reaction tendency.
Abstract
The extinction behavior and chemical interaction characteristics of ammonia cracking simulated fuels were investigated in twin counterflow burner with flame interactions. The UCSD mechanism showed the best agreement with the experimental extinction limits under a cracking ratio of 16%. The flame stability map was presented with global strain rate and volumetric fraction of H2 as a major variable. As the strain rate increases, the extinction boundary narrows, and the lean extinction boundary shows a steeper slope and stronger interaction compared to the rich extinction boundary. Under rich conditions, as the strain rate increases, the heat release rate and maximum temperature of the flames decrease leading to extinction. Through flame structure analysis, it is confirmed that the preferential diffusion of H and H2 occurs under lean extinction limit conditions, and the consumption reaction of HNO becomes more active, leading to a chain-terminating reaction tendency.
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