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The Effects of Combustion Products Dilution and Wall Temperature on the Ignition of Methane Fuel

메탄연료의 점화특성에 미치는 연소 생성물 희석 및 벽면온도의 영향

  • Received : 2012.03.19
  • Accepted : 2012.10.09
  • Published : 2012.10.31

Abstract

The ignition characteristics in a confined axisymmetric coflow $CH_4$ jet were investigated numerically with the Fire Dynamics Simulator(FDS). The $CH_4$ fuel stream was diluted with main combustion product gases, such as $O_2$, $N_2$, CO, $CO_2$, and $H_2O$, and the mixed fuel stream was heated up to the sufficient temperature where a supplying fuel stream can be ignited. For the calculation of chemical reaction in the simulation, a 2-step global finite chemistry model was considered. Boundary condition for confined wall was optimized by investigating the effects of wall temperature on the ignition characteristics of fuel stream. In addition, the effects of composition of diluents in the fuel stream and fuel stream temperature on the ignition of fuel steam were investigated. The ignition characteristics of $CH_4$ stream with diluents were very sensitive to the wall temperature, composition of diluents in the fuel stream and fuel stream temperature.

Keywords

ignition;wall temperature effect;numerical simulation;fire dynamic simulator(FDS);axisymmetric coflow jet

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Acknowledgement

Supported by : 한국연구재단