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

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of Spray Characteristics of Water Mist on The Extinction of a Liquid Pool Fire

분무수 분무특성이 액체연료 Pool 화염의 소화에 미치는 영향

  • 김호영 (고려대학교 기계공학과) ;
  • 오상엽 (고려대학교 대학원 기계공학과) ;
  • 정진택 (고려대학교 기계공학과)
  • Published : 2004.12.01
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Abstract

A series of experiments were conducted to study the effectiveness of the extinction of a liquid pool fire with two different water atomizing nozzles. Fire source is a small-scale circular stainless steel pan of 120mm in diameter with the fuels of hexane and ethanol. K-type thermocouples were used to measure the flame and fuel temperature along the pool centerline and under fuel surface. A digital camera was used to visualize the process of the fire suppression. The experimental results show that water mist droplet size is l15∼180${\mu}{\textrm}{m}$ with nozzle A and 130∼190${\mu}{\textrm}{m}$ with nozzle B. The extinguishing time of pool fire was reduced with the increase of pressure. When water droplets are small, they do not reach the flame base since they may be deflected or evaporated by the fire plume. However, influence of flow rate is more important than droplet size on fire extinction. Among the fire extinction mechanisms, drop of flame temperature is superior to suffocation of $O_2$ concentration.

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References

  1. Hong, K. P., Lee, Y. J. and Kim, S. J., 2001, 'A Study of Smokeproof in Underground Culvert,' Trans. of Korea Institute of Fire Sci. & Eng, Vol. 15, No. 4, pp. 57-63
  2. Park, S. M., Kim, W. H. and Mawhinney, J. R., 2001, 'Water Mist Suppression System on Underground Utility Tunnel,' Trans. of Korea Institute of Fire Sci. & Eng Atom , pp. 294-300
  3. Kim, M. B., 2000, 'A State of the Art for Water Mist Fire Protection Systems and Introduction of NFPA 750,' Journal of Korean Institute of Sci & Eng, Vol. 1, No. 2, pp. 2-5
  4. Lee, K. D., 2002, 'Optimization of Extinguishing Performance and Effect of Additives for Low Pressure Fine Water Mist System,' Dept. of Safety Engineering Chungbuk National University Doctor Thesis
  5. Jang, Y. J., Kim, M. B. and Kim, J. K., 1996, 'Experimental Study of Extinguishment of the Pure Diffusion Flame Using Water Spray,' Trans. of the KSME B, Vol. 20, No. 2, pp. 624-631
  6. Jones, A. and Nolan, P. F., 1995, 'Discussions on the Use of Fine Water Sprays or Mists for Fire Suppression,' Journal of Loss Prev. Process Ind., Vol. 8, No. 1, pp. 17-22 https://doi.org/10.1016/0950-4230(95)90057-V
  7. Wang Xishi, Liao Guangxuan, Qin Jun and Fan Weicheng, 2002, 'Experimental Study on the Effectiveness of the Extinction of a Pool Fire with Water Mist,' Journal of Fire Science, Vol. 20, pp. 279-295 https://doi.org/10.1177/073490402762574730
  8. Jeong, J. Y., Ryou, H. S., Lee J. H. and Hong, G. B., 2002, 'An Experimental Study of Smoke Movement of the Various Fire Location in Room,' Trans. of the KSME B, Vol. 26, No. 5, pp. 703-709 https://doi.org/10.3795/KSME-B.2002.26.5.703
  9. Kim, S. C., Ryou, H. S., Park, H. T. and Bang, K. Y., 2003, 'Effect of Spray Angle of Water Mist Nozzle on Temperature Field of Compartment Fire,' Proc. of the KSME 2003 spring, pp. 1703-1708
  10. Ndubizu, C. C., Ananth, R., Tatem, P. A. and Motevalli, V., 1998, 'On Eater Mist Fire Suppression Mechanisms in a Gaseous Diffusion Flame,' Fire Safety Journal 31, pp. 253-276 https://doi.org/10.1016/S0379-7112(98)00007-1
  11. Yao, B., Fan, W. and Liao, G., 1999, 'Interaction of Water Mists with a Diffusion Flame in a Confined Space,' Fire Safety Journal 33, pp. 129-139 https://doi.org/10.1016/S0379-7112(99)00020-X
  12. Shimizu, H., Tsuzuki, M., Yamazaki, Y. and Koichi Hayashi, A., 2001, 'Experimental and Numerical Simulation on Methane Flame Quenching by Water Mist,' Journal of Loss Prevention in the Process Industries 14, pp. 603-608 https://doi.org/10.1016/S0950-4230(01)00055-9
  13. Richard, J., Garo, J. P., Souil, J. M., Vantelon, J. P. and Knorre, V. G., 2003, 'Chemical and Physical Effects of Water Vapor Addition on Diffusion Flames,' Fire Safety Journal 38, pp. 569-587 https://doi.org/10.1016/S0379-7112(03)00012-2