Flame Characteristics and NO Emission Behaviors in (CH4+NH3)/air Counterflow Premixed Flames Having Downstream Interaction with Opposed NH3/air Premixed Flames

Huido Lee; Chun Sang Yoo; Jeong Park

doi:10.15231/jksc.2024.29.1.057

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2024 Vol.29, Issue 1 Preview Page

Research Article

Flame Characteristics and NO Emission Behaviors in (CH₄+NH₃)/air Counterflow Premixed Flames Having Downstream Interaction with Opposed NH₃/air Premixed Flames 암모니아/공기가 대향으로 분사되는 (메탄+암모니아)/공기 대향류 예혼합 화염에서 후류 상호 작용하의 화염 특성과 NO 배출 거동

31 March 2024. pp. 57-65

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Abstract

Flame characteristics and NO emission behaviors are studied for (80% CH₄+20% NH₃)/air premixed counterflow flames having downstream interactions with NH₃/air premixed flames, by varying strain rate and equivalence ratio. Extinction strain rates against equivalence ratio (ϕ_sec) in the secondary zone are numerically presented for the equivalence ratios (ϕ_pri) in the primary combustion zone ϕ_pri = 0.8 and 1.2 as representative cases. The flame structures are analyzed, and the concept of local equilibrium temperature and loss ratio are introduced to clarify the mechanisms of flame extinction. NO emission indices are presented for a specified ϕ_pri = 1.2 (a favorable mixture condition in ammonia-blended fuel) by varying ϕ_sec. NO related reaction paths are examined to explain the important paths in NO reduction. The results show that NO reduction is obtained via enhancing the paths of NH → NNH and NH → N₂, though it should be confirmed by further future works because these cover only such case studies. The present study can mimic a two-stage swirl combustion with having a small separation distance between the primary and secondary combustion zones. Therefore, the present results can be utilized in a two-stage swirl combustion with having a small separation, where the primary and secondary premixed flames experience strong interactions.

Keywords

Downstream interaction

NO emission

Local equilibrium temperature

Loss ratio

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Information

Publisher :The Korean Society of Combustion
Publisher(Ko) :한국연소학회
Journal Title :Journal of the Korean Society of Combustion
Journal Title(Ko) :한국연소학회지
Volume : 29
No :1
Pages :57-65
Received Date : 2024-01-23
Revised Date : 2024-03-11
Accepted Date : 2024-03-13
DOI :https://doi.org/10.15231/jksc.2024.29.1.057

Journal of the Korean Society of Combustion ISSN:1226-0959(Print) 2466-2089(Online) 한국연소학회지

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