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

  • 제30권4호
  • /
  • Pages.343-349
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  • 2006
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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저신장율 에지 화염의 진동 불안정성

Oscillatory Instability of Low Strain Rate Edge Flame

  • 김강태 (순천대학교 기계자동차공학부) ;
  • 박준성 (순천대학교 기계자동차공학부) ;
  • 김정수 (순천대학교 기계자동차공학부) ;
  • 오창보 (한국기계연구원 에너지기계연구센터) ;
  • 길상인 (한국기계연구원 청정환경기계연구센터) ;
  • 박정 (순천대학교 기계자동차공학부)
  • 발행 : 2006.04.01
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초록

Systematic experiments in $CH_4/Air$ counterflow diffusion flames diluted with He have been undertaken to study the oscillatory instability in which lateral flame size was less than burner nozzle diameter and thus lateral heat loss could be remarkable at low global strain rate. The oscillatory instability arises for Lewis numbers greater than unity and occurs near extinction condition. The oscillation is the direct outcome from the advancing and retreating edge flame. The dynamic behaviors of extinction in this configuration can be classified into three modes; growing, harmonic and decaying oscillation mode near extinction. As the global strain rate decreases, the amplitude of the oscillation becomes larger. This is caused by the increase of lateral heat loss which can be confirmed by the reduction of lateral flame size. Oscillatory edge flame instabilities at low global strain rate are shown to be closely associated with not only Lewis number but also heat loss (radiation and lateral heat loss).

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참고문헌

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