한국연소학회지 (Journal of the Korean Society of Combustion)
- 제8권3호
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- Pages.38-48
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- 2003
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- 1226-0959(pISSN)
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- 2466-2089(eISSN)
2-D LIF를 이용한 층류화염의 NO 생성특성에 관한 연구
A Study of NO Formation Characteristics in Laminar Flames Using 2-D LIF Technique
- 발행 : 2003.09.30
초록
OH, CH and NO radical distributions have been measured and compared with the numerical analysis results in methane/air partially premixed laminar flames using 2-D LIF technique. The pick intensity of OH LIF signal is insensitive to fuel equivalence ratio: however, CH LIF intensity decreases as equivalence ratio increases and the NO concentration increases with equivalence ratio. The contribution of the prompt NO, formed near premixed reaction zone, to the total NO formation is evident from the OH, CH, and NO PLIF images in which the dilution effect of nitrogen is minimal for the highest equivalence ratio. Measured OH and NO LIF signals in counterflow flames agree with the computed concentration distributions. Both numerical and experimental results indicate that the structural change in a flame alters the NO formation characteristics of a partially premixed counterflow flame. The nitrogen dilution also changes flame structure, temperature and OH radical distributions and results in the decreased NO concentrations in a flame. The levels of decrease in NO concentrations, however, depends on the premixedness(