대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제30권10호
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  • Pages.996-1002
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  • 2006
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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저신장율 대향류확산화염에서 에지화염 불안정성에 관한 열손실 효과

Effects of Heat Losses on Edge-flame Instabilities in Low Strain Rate Counterflow Diffusion Flames

  • 박준성 (순천대학교 기계우주항공공학부) ;
  • 황동진 (순천대학교 기계우주항공공학부) ;
  • 김정수 (순천대학교 기계우주항공공학부) ;
  • 길상인 (한국기계연구원 청정환경기계연구센터) ;
  • 김태권 (계명대학교 기계자동차공학부) ;
  • 박정 (순천대학교 기계우주항공공학부)
  • 발행 : 2006.10.01
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초록

Experiments in methane-air low strain rate counterflow diffusion flames diluted with nitrogen have been conducted to study the behavior of flame extinction and edge flame oscillation in which flame length is less than the burner diameter and thus lateral conduction heat loss in addition to radiative heat loss could be remarkable at low global strain rates. Critical mole fraction at flame extinction is examined with velocity ratio and global strain rate. Onset conditions of edge flame oscillation and flame oscillation modes are also provided with global strain rate and added nitrogen mole fraction to fuel stream (fuel Lewis number). It is seen that flame length is closely relevant to lateral heat loss, and this affects flame extinction and edge flame oscillation considerably. Edge flame oscillations in low strain rate flames are experimentally described well and are categorized into three: a growing oscillation mode, a decaying oscillation mode, and a harmonic oscillation mode. The regime of flame oscillation is also provided at low strain rate flames. Important contribution of lateral heat loss even to edge flame oscillation is clarified

키워드

참고문헌

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