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Yoo, Chun Sang
Combustion and Propulsion Lab.
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dc.citation.startPage 131851 -
dc.citation.title FUEL -
dc.citation.volume 370 -
dc.contributor.author Lee, Huido -
dc.contributor.author Lee, Jong Moon -
dc.contributor.author Park, Jeong -
dc.contributor.author Chung, Suk Ho -
dc.contributor.author Yoo, Chun Sang -
dc.date.accessioned 2024-05-21T11:35:08Z -
dc.date.available 2024-05-21T11:35:08Z -
dc.date.created 2024-05-21 -
dc.date.issued 2024-08 -
dc.description.abstract Behaviors of methane/ammonia counterflow premixed flames and NO emission are numerically and experimentally investigated with opposed N2 or air stream by varying strain rate (ag) and equivalence ratio (ϕ). The premixed stream is 80% methane and 20% ammonia by volume mixed with air considering the utilization of ammonia by blending hydrocarbon fuels. The opposed stream is either N2 or air considering the potential application in gas turbines having single- or two-stage combustion. The simulations are conducted by increasing ag up to flame extinction for a specified ϕ and an experiment is conducted to evaluate various kinetic mechanisms. The extinction strain rate increases monotonically with ϕ with opposed air stream (AS), while increases and then decreases with opposed nitrogen stream (NS). The extinction mechanisms are explained by adopting the concepts of the local equilibrium temperature and heat loss ratio. For lean and rich mixtures with NS and lean mixtures with AS, the extinction occurs due to comparable effects of incomplete reaction and heat loss from the flame to the downstream burnt region. While for rich mixtures with AS, the extinction is attributed mainly to incomplete reaction. The contribution of thermal NO as compared with prompt NO in NO production is weak for all cases with NS and AS. The emission index (EINO) for lean and rich mixtures with NS and for lean mixtures with AS decreases monotonically with the increase of strain rate for all ϕ. Increasing equivalence ratio at a specified ag decreases NO production for lean and rich mixtures with NS and lean mixtures with AS. While for rich mixtures with AS, the EINO increases monotonically with ag. From the reaction pathway analysis, for lean mixtures, the effect of increasing ag on the reduction of NO production is attributed by weakening NH-related reaction paths, while NH2-related reaction paths change little. When ϕ increases for a specified ag with NS, NO production is reduced by weakening NH2-related reaction paths and strengthening NH-related reaction paths. For rich mixtures with AS, increasing ag increases NO production by strengthening NH2-related reaction paths. -
dc.identifier.bibliographicCitation FUEL, v.370, pp.131851 -
dc.identifier.doi 10.1016/j.fuel.2024.131851 -
dc.identifier.issn 0016-2361 -
dc.identifier.scopusid 2-s2.0-85192682665 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/82653 -
dc.identifier.wosid 001240757900001 -
dc.language 영어 -
dc.publisher Elsevier BV -
dc.title Flame characteristics and NO emission behaviors of methane/ammonia counterflow premixed flames with opposed N2 or air stream -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Energy & Fuels;Engineering, Chemical -
dc.relation.journalResearchArea Energy & Fuels;Engineering -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor Extinction -
dc.subject.keywordAuthor Heat loss ratio -
dc.subject.keywordAuthor Local equilibrium temperature -
dc.subject.keywordAuthor NO emission -
dc.subject.keywordAuthor Ammonia -
dc.subject.keywordAuthor Counterflow flame -
dc.subject.keywordPlus LAMINAR BURNING VELOCITY -
dc.subject.keywordPlus DOWNSTREAM INTERACTION -
dc.subject.keywordPlus NITROGEN CHEMISTRY -

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