Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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Experimental Study on Flame Extinction in Buoyancy-minimized Counterflow Diffusion Flame

부력의 영향을 최소화한 조건에서 대향류 확산화염의 화염 소화에 관한 실험적 연구

  • Chung, Yong Ho (Dept. of Mechanical Engineering, Pukyong National University) ;
  • Park, Jin Wook (Dept. of Mechanical Engineering, Pukyong National University) ;
  • Park, Jeong (Dept. of Mechanical Engineering, Pukyong National University) ;
  • Kwon, Oh Boong (Dept. of Mechanical Engineering, Pukyong National University) ;
  • Yun, Jin-Han (Environment & Energy Research Division, Korea Institute of Machinery and Materials) ;
  • Keel, Sang-In (Environment & Energy Research Division, Korea Institute of Machinery and Materials)
  • 정용호 (부경대학교 기계공학과) ;
  • 박진욱 (부경대학교 기계공학과) ;
  • 박정 (부경대학교 기계공학과) ;
  • 권오붕 (부경대학교 기계공학과) ;
  • 윤진한 (한국 기계연구원 그린환경에너지기계본부) ;
  • 길상인 (한국 기계연구원 그린환경에너지기계본부)
  • Received : 2014.02.16
  • Accepted : 2014.06.16
  • Published : 2014.06.30
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Abstract

Experiments were conducted to clarify role of the outermost edge flame on low-strain-rate flame extinction in buoyancy-suppressed non-premixed methane flames diluted with He and $N_2$. The use of He curtain flow produced a microgravity level of $10^{-2}-10^{-3}g$ in $N_2$- and He-diluted non-premixed counterflow flame experiments. The critical He and $N_2$ mole fractions at extinction with a global strain rate were examined at various burner diameters (10, 20, and 25 mm). The results showed that the extinction curves differed appreciably with burner diameter. Before the turning point along the extinction curve, low-strain-rate flames were extinguished via shrinkage of the outermost edge flame with and without self-excitation. High-strain-rate flames were extinguished via a flame hole while the outermost edge flame was stationary. These characteristics could be identified by the behavior of the outermost edge flame. The results also showed that the outermost edge flame was not influenced by radiative heat loss but by convective heat addition and conductive heat losses to the ambient He curtain flow. The numerical results were discussed in detail. The self-excitation before the extinction of a low-strain-rate flame was well described by a dependency of the Strouhal number on global strain rate and normalized nozzle exit velocity.

Keywords

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