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

  • 제29권9호
  • /
  • Pages.988-996
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  • 2005
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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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미소 중력장에 있는 저신장율 화염소화에 미치는 다차원 효과

Multi-Dimensional Effects on a tow Strain Rate Flame Extinction Under Microgravity Environment

  • 오창보 (한국기계연구원 에너지기계연구센터) ;
  • 김정수 (국립순천대학교 기계자동차공학부) ;
  • ;
  • 박정 (국립순천대학교 기계자동차공학부)
  • 발행 : 2005.09.01
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초록

Flame structure and extinction mechanism of counterflow methane/air non-premixed flame diluted with nitrogen are studied by NASA 2.2 s drop tower experiments and two-dimensional numerical simulations with finite rate chemistry and transport properties. Extinction mechanism at low strain rate is examined through the comparison among results of microgravity experiment, 1D and 2D simulations with a finite burner diameter. A two-dimensional simulation in counterflow flame especially with a finite burner diameter is shown to be very important in explaining the importance of multidimensional effects and lateral heat loss in flame extinction, effects that cannot be understood using a one-dimensional flamelet model. Extinction mechanism at low strain rate is quite different from that at high strain rate. Low strain rate flame is extinguished initially at the outer flame edge, the flame shrinks inward, and finally is extinguished at the center. It is clarified from the overall fractional contribution by each term in energy equation to heat release rate that the contribution of radiation fraction with 1D and 2D simulations does not change so much and the overall fractional contribution is decisively attributed to radial conduction ('lateral heat loss'). The experiments by Maruta et at. can be only completely understood if multi-dimensional heat loss effects are considered. It is, as a result, verified that the turning point, which is caused only by pure radiation heat loss, has to be shifted towards much lower global strain rate in microgravity flame.

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참고문헌

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