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2020 Vol.25, Issue 4 Preview Page

Research Article

The Extinction Characteristics of Interacting SNG-Air Lean Premixed Asymmetric Flames

상호작용하는 SNG-Air 희박 예혼합 비대칭 화염의 소화 특성

Yeon Se Kang1
,
Jih Wan Ahn1
,
Keun Seon Sim2
,
Kee Man Lee3†
강 연세1
,
안 지환1
,
심 근선2
,
이 기만3†
1Department of Aerospace Engineering, Sunchon National University
2Energy Safety Empirical Research Center, Korea Gas Safety Corporation
3School of Mechanical and Aerospace Engineering, Sunchon National University
1순천대학교(원) 우주항공공학전공
2한국가스안전공사 에너지 안전실증연구센터
3순천대학교 기계 ․ 우주항공공학부
*kmlee@scnu.ac.kr
31 December 2020. pp. 8-18
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Abstract

Experimental and numerical studies were conducted to clarify the extinction mechanism in mutually interacting SNG (synthetic natural gas) - air premixed asymmetric counter-flow flames. The detailed kinetic mechanism of UC San Diego with which the priority of predicting measured extinction boundaries was validated was adopted to analyze various aspects via up and downstream interactions on extinction boundaries in the flame stability map. The flame stability map was presented with a functional dependency on methane mole fractions in the cold stream ejecting from upper and lower nozzles by varying the global strain rate. Increasing global strain rate lead gradually slanted and configuring of island flammable region and finally only one flammable condition at 740 s-1 through the shrinkage of flammable region. The interacting lean-lean asymmetric flames of extinction boundaries have flame speed of positive (negative) depending on the deviation of methane mole fraction for two reactants. The extinction mechanism of those flames was explained and discussed by emphasizing important role of downstream chemical interaction (via H and CO) and upstream thermal interaction (via conductive heat loss from stronger flame to unburned mixture).

Keywords
SNG (synthetic natural gas)
Flame stability diagram
Chemical interaction
Conductive thermal interaction
Overall extinction mechanism
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Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 25
  • No :4
  • Pages :8-18
  • Received Date : 2020-09-07
  • Revised Date : 2020-11-06
  • Accepted Date : 2020-11-09
  • DOI :https://doi.org/10.15231/jksc.2020.25.4.008
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