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

The Korean Society of Mechanical Engineers (대한기계학회)
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Edge Flame Instability of CH4-Air Diffusion Flame Diluted with CO2

이산화탄소로 희석된 메탄-공기 확산화염의 에지화염 불안정성

  • 황동진 (순천대학교 기계우주항공공학부) ;
  • 김정수 (한국기계연구원 청정환경기계연구센터) ;
  • 길상인 (순천대학교 기계우주항공공학부) ;
  • 김태권 (계명대학교 기계자동차공학부) ;
  • 박정 (순천대학교 기계우주항공공학부)
  • Published : 2006.09.01
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Abstract

Experiments in low strain rate methane-air counterflow diffusion flames diluted with $CO_2$ have been conducted to investigate the flame extinction behavior and edge flame oscillation in which flame length is less than the burner diameter and thus lateral conductive heat loss in addition to radiative loss could be remarkable at low global strain rates. The critical mole fraction at flame extinction is examined in terms of velocity ratio and global strain rate. It is seen that flame length is closely relevant to lateral heat loss, and this sheets flame extinction and edge flame oscillation considerably. Lateral heat loss causes flame oscillation even at fuel Lewis number less than unity. Edge flame oscillations are categorized into three: a growing-, a harmonic- and a decaying-oscillation mode. Onset conditions of the edge flame oscillation and the relevant modes are examined with global strain rate and $CO_2$ mole fraction in fuel stream. A flame stability map based on the flame oscillation modes is also provided at low strain rate flames.

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References

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