Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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A Study on Flame Extinction and Edge Flame Oscillation in Counterflow Diffusion Flame

대향류확산화염에서 화염소화와 에지화염진동에 관한 연구

  • 박대근 (부경대학교 에너지시스템공학과(원)) ;
  • 윤진한 (한국기계연구원 그린환경기계본부) ;
  • 박정 (부경대학교 기계공학부) ;
  • 길상인 (한국기계연구원 그린환경기계본부)
  • Published : 2009.04.30
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Abstract

Experimental and numerical studies are conducted on the characteristics of flame extinction and edge flame oscillation in counterflow diffusion flames. The characteristics of flame extinction and edge flame oscillation are well described varying burner diameter, separation distance between two burners, global strain rate, and velocity ratio. It is verified numerically and experimentally that radial conduction heat loss significantly contributes to flame extinction and edge flame oscillation at low strain rate flames in zero- and micro-gravity. It is also shown that for appropriately small burner diameters flame extinction modes are grouped into four and these are significantly attributed to excessive radial conduction heat loss. The edge flame oscillation can be characterized well by one curve with Strouhal number and Peclet number.

대향류확산화염에서 화염소화와 에지화염 진동 특성에 관한 실험 및 수치해석 연구가 수행된다. 이러한 특성들은 버너 직경, 버너간 거리, 전체신장율, 그리고 속도비를 변화시키며 묘사된다. 실험과 수치해석으로부터 반경방향으로 전도열손실이 미소중력 및 중력 조건에서 화염소화와 에지화염 진동에 크게 기여한다는 것이 입증된다. 적절히 작은 버너직경을 사용한 경우에 화염 소화 모드는 4가지로 분류되며, 과다한 반경방향 열손실에 기인한다는 것이 밝혀진다. 에지화염 진동은 Strouhal 수와 Peclet 수에 의해 하나의 곡선으로 잘 특성화된다.

Keywords

References

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