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

The Korean Society of Mechanical Engineers (대한기계학회)
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Stabilization Characteristics of DME-Air Diffusion Flames Depending on the Configuration of the Fuel-Air Tubes in Half Closed Combustion Spaces

반밀폐 연소공간 내 동축관 형상에 따른 DME-공기 확산화염의 안정화 특성

  • 김고태 (중앙대학교 기계공학부 대학원) ;
  • 김남일 (중앙대학교 기계공학부)
  • Published : 2009.11.01
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Abstract

The effects of configuration of fuel and air tubes on the flame stabilization were experimentally investigated in half-closed combustors. Flame behaviors and stabilities of methane, propane, and DME flames were compared by changing tube diameters and the locations of the fuel and air tubes. It was found that flammability limits are significantly affected by the outlet boundary condition, which disturbs compositions of burned and unburned mixtures near the flame base. And it was found that there exist critical inner tube heights, over which flame stability is determined only by the fuel flow rate. Conclusively, flame stabilization is governed by the flame propagation velocity in an ordinary mixing flow and the non-uniform mixture concentration in the combustion space which is affected by flow recirculation and the combustor configuration. The compositions of $NO_x$ and CO were compared to know basic characteristics of methane, propane, and DME flames.

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References

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