Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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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

  • Song, Keum-Mi (Department of Safety Engineering, Pukyong National University) ;
  • Oh, Chang-Bo (Department of Safety Engineering, Pukyong National University)
  • 송금미 (부경대학교 안전공학과) ;
  • 오창보 (부경대학교 안전공학과)
  • Received : 2012.03.19
  • Accepted : 2012.10.09
  • Published : 2012.10.31
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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

Acknowledgement

Supported by : 한국연구재단

References

  1. D. T. Gottuk, M. J. Peatross, J. P. Farley, and F. W. Williams, "The Development and Mitigation of Backdraft: a Real-scale Shipboard Study", Fire Safety Journal, Vol. 33, pp. 261-282, 1999. https://doi.org/10.1016/S0379-7112(99)00033-8
  2. W. G. Weng and W. C. Fan, "Nonlinear Analysis of the Backdraft Phenomenon in Room Fires", Fire Safety Journal, Vol. 39, pp. 447-464, 2004. https://doi.org/10.1016/j.firesaf.2004.04.001
  3. C. M. Fleischmann, and K. B. McGrattan, "Numerical and Experimental Gravity Currents Related to Backdrafts", Fire Safety Journal, Vol. 33, pp. 21-34, 1999. https://doi.org/10.1016/S0379-7112(98)00046-0
  4. W. G. Weng and W. C. Fan, "Critical Condition of Backdraft in Compartment Fires: a Reduced Scale Experimental Study", Journal of Loss Prevention in the Process Industries, Vol. 16, pp. 19-26, 2003. https://doi.org/10.1016/S0950-4230(02)00088-8
  5. R. Yang, W. G. Weng, W. C. Fan, and Y. S. Wang, "Subgrid Scale Laminar Flamelet Model for Partially Premixed Combustion and its Application to Backdraft Simulation", Fire Safety Journal, Vol. 40, pp. 81-98, 2005. https://doi.org/10.1016/j.firesaf.2004.09.004
  6. M. Nishioka, C. K. Law, and T. Takeno, "A Flame- Controlling Continuation Method for Generating S-Curve Responses with Detailed Chemistry", Combustion and Flame, Vol. 104, pp. 328-342, 1996. https://doi.org/10.1016/0010-2180(95)00132-8
  7. 송금미, 오창보, "화염제어 연속계산법을 이용한 $CH_4^-$고온공기 확산화염의 점화특성 연구", 대한기계학회논문집 B권, Vol. 35, No. 6, pp. 625-632, 2011.
  8. K. McGrattan, B. Kelvin, S. Hostikka, and J. Floyd, "Fire Dynamics Simulator (Version 5) User's Guide", NIST, Special Publication 1019-5, 2008.
  9. V. DuPont, M. Pourkashanism and A. Williams, "Global Kinetic Mechanism Rate Expressions for Methane", Journal of the Energy Institute, Vol. 66, pp. 20-28, 1993.
  10. 박은정, 오창보, "제트 확산화염구조에 대한 FDS연소모델의 예측성능 비교 연구", 한국안전학회지, Vol. 25, No. 3, pp. 22-27, 2010.
  11. A. Horvat, Y. Sinat, D. Gojkovic and B. Karlsson, "Numerical and Experimental Investigation of Backdraft", Combustion Science and Technology, Vol. 180, pp. 45-63, 2008.
  12. C. B. Oh, E. J. Lee, and G. J. Jung, "Unsteady Autoignition of Hydrogen in a Perfectly Stirred Reactor with Oscillating Residence Times", Chemical Engineering Science, Vol. 66, pp. 4605-4614, 2011. https://doi.org/10.1016/j.ces.2011.06.029
  13. C. T. Bowman, M. Frenklach, W. R. Gardiner, and G. Smith, "The GRI 3.0 Chemical Kinetic Mechanism", http://www.me.berkeley.edu/gri-mech, 1999.
  14. C. G. Fotache, T. G. Kreutz and C. K. Law, "Ignition of Hydrogen-Enriched Methane by Heated Air", Combustion and Flame, Vol. 110, pp. 429-440, 1997. https://doi.org/10.1016/S0010-2180(97)00084-9