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

  • 제33권4호
  • /
  • Pages.264-271
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  • 2009
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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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좁은 채널 내의 대향분류 메탄-공기 비예혼합 화염의 거동 특성

Behavioral Characteristics of the Non-Premixed Methane-Air Flame Oppositely Injected in a Narrow Channel

  • 윤영민 (중앙대학교 대학원 기계공학부) ;
  • 이민정 (중앙대학교 대학원 기계공학부) ;
  • 조상문 (중앙대학교 대학원 기계공학부) ;
  • 김남일 (중앙대학교 기계공학부)
  • 발행 : 2009.04.01
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초록

Characteristics of a counter flowing diffusion flame, which is formulated by an oppositely-injected methane-jet flow in a narrow channel of a uniform air flow. The location of the flame fronts and the flame lengths were compared by changing the flow rates of fuel. To distinguish the effects of the narrow channel on the diffusion flame, a numerical simulation for an ideal two-dimensional flame was conducted. Overall trends of the flame behavior were similar in both numerical and experimental results. With the increase of the ratio of jet velocity to air velocity flame front moved farther upstream. It is thought that the flow re-direction in the channel suppresses fuel momentum more significantly due to the higher temperature and increased viscosity of burned gas. Actual flames in a narrow channel suffer heat loss to the ambient and it has finite length of diffusion flame in contrast to the numerical results of infinite flame length. Thus a convective heat loss was additionally employed in numerical simulation and closer results were obtained. These results can be used as basic data in development of a small combustor of a nonpremixed flame.

키워드

참고문헌

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