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

  • 제33권7호
  • /
  • Pages.535-540
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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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C-곡선상의 화염 소화 특성에 있어서 대향류 버너직경 효과

Effects of Counterflow Burner Diameter on the Characteristics of Flame Extinction in C-curve

  • 박대근 (부경대학교 에너지시스템공학과(원)) ;
  • 박정 (부경대학교 기계공학부) ;
  • 윤진한 (한국기계연구원 그린환경기계연구본부) ;
  • 길상인 (한국기계연구원 그린환경기계연구본부)
  • 발행 : 2009.07.01
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초록

Experiments are conducted to elucidate effects of counterflow burner diameter on flame extinction behaviors in C-curve. Present experimental results with burner diameters of 18, 26, and 50 mm in normal-gravity are compared with the numerical result of Oppdif code as well as the previous experimental results in micro-gravity. The turning point migrates to a higher global strain rate as burner diameter decreases. It is shown that the C-curve with the burner diameter of 50mm is best-fitted to the numerical result of Oppdif code and the previous micro-gravity results also excurse to the numerical result. This suggests that the precise C-curve can be obtained only with an appreciably large burner. The main reason why these differences appear is shown to be attributed to the transition of shrinking flame disk to flame hole due to strong effects of radial conduction heat loss, which is the typical extinction characteristics of low strain rate flames with a finite burner diameter in a counterflow diffusion flame.

키워드

참고문헌

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