Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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Stabilization of Inert-Gas-Diluted Co-Flow Diffusion Flame by a Pilot Flame

불활성기체로 희석된 동축류 확산화염의 파일럿화염에 의한 안정화

  • Ahn, Taekook (Department of Mechanical Engineering, Dankook University) ;
  • Lee, Wonnam (Department of Mechanical Engineering, Dankook University) ;
  • Park, Sunho (Department of Mechanical Engineering, Dankook University)
  • Received : 2015.08.06
  • Accepted : 2015.11.30
  • Published : 2015.12.30
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Abstract

An experimental study was conducted to find the effect of a pilot flame on the flammability of inert-gas-diluted methane and propane. The diffusion pilot flame was formed with propane at the innermost nozzle of a concentric triple co-flow burner. The main diffusion flame was formed with nitrogen-diluted methane or propane at the outermost nozzle of the burner. An air flow was located in-between. The results showed that the existence of the pilot flame helped stabilizing the main flame even at the flammability limit concentration of nitrogen-diluted fuel. The co-flow burner generated re-circulation zones and local variation of equivalence ratio depending on the flow rates of the reactants, which are known to help flame stabilization. Hot-wire experiments confirmed that both heating of the reactants and supplying of active chemical species by the pilot flame contributed to stabilization of the main flame. The results of this study would suggest a design concept for an efficient SVRU system that minimizes the emission of unburned hydrocarbon fuel from ship fuel tanks.

Keywords

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