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학술대회자료
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한국연소학회 KOSCO SYMPOSIUM 논문집 제36회 KOSCO SYMPOSIUM 논문집
발행연도
2008.5
수록면
114 - 121 (8page)

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Detailed analysis of NO formation routes and its contributions with strain rate in hydrogen/air flames were numerically investigated. LiG detailed reaction mechanism have been used for calculation, which is compared with experimental data in literature. It shows good agreement with experiment for both temperature and NO mole fraction. Three routes have been found important for NO formation in hydrogen flames. These are the Thermal route, NNH route and N₂O route. Strain rate were varied to discuss the EI<SUB>NO</SUB> reduction trend in hydrogen nonpremixed flames, which is analyzed by each NO formation routes. As a result, as the strain rate increased, EI<SUB>NO</SUB> decrease sharply until strain rate l00(s<SUP>-1</SUP>) and decrease slowly until strain rate 310(s<SUP>-1</SUP>) again, after that EI<SUB>NO</SUB> keeps nearly constant. It can be identified that EI<SUB>NO</SUB> trend with the strain rate is well explained by a combination of variation of production rate of above Thermal, NNH and N₂O route. Also Result of Thermal-Mech. that include only thermal NO reaction compared with those of Full-Mech. As a result, It can be identified that there was difference at two results of calculation. It is attributed to result that Thermal-mech did not consider contributions of NNH and N₂O route. From these result, we can conclude that NOx emission characteristics of hydrogen non premixed flames should be consider contributions of above three routes simultaneously.

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