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A Numerical Study on the Fire Suppression Characteristics of a Water Mist with Natural Wind in a Road Tunnel  

Hwang, Cheol-Hong (인하대학교 기계공학과)
Kim, Han-Su (인하대학교 기계공학과)
Lee, Chang-Eon (인하대학교 기계공학과)
Jang, Young-Nam ((주)우당기술산업연구소)
Shin, Hyun-Joon (한국건설기술연구원)
Publication Information
Fire Science and Engineering / v.22, no.3, 2008 , pp. 221-227 More about this Journal
Abstract
In this study, the fire suppression characteristics of a water mist with natural wind in a road tunnel were calculated using the FDS(Fire Dynamic Simulation) code. In addition, the cooling and the chemical kinetic effects of water vapor on fire extinction ere investigated in a counterflow non-premixed flame using a detailed chemistry. As a result, the behavior of fire plume and the spray characteristics of water mist are modified remarkably with the increasing of wind velocity. In the case which is not the external natural wind, small droplets are more efficient in fire suppression than large droplets. However, the large droplets show better results on the fire suppression than the small droplets with the increasing of wind velocity. It can be estimated that the natural wind disturb the penetration of water droplets into the flame region and decrease the effect of oxygen dilution. Finally, it can be identified that the fire into the natural wind can be suppressed with smaller amount of $H_2O$ by flame stretching effect in the flame region than one in an enclosure, and the chemical kinetic effects of $H_2O$ on fire extinction are not affected significantly the velocity of natural wind.
Keywords
Water mist; Fire suppression; Tunnel; Extinction mechanism; Water vapor;
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  • Reference
1 J.R. Mawhinney, B.Z. Dlugogorski and A.K. Kim, "A Closer Look at the Fire Extinguishing Properties of Water Mist", Fire Safety Science - Proceedings of Fourth International Symposium, pp.47-60(1994)
2 K.B. McGrattan, R.G. Rehm and H.R. Baum, "Large Eddy Simulation of Smoke Movement", Fire Safety Journal, Vol.30, No.2, pp.161-178(1998)   DOI   ScienceOn
3 W.E. Ranz and Jr. W.R. Marshell, "Evaporating from Drops, Part", Chem. Eng. Prog., Vol.48, pp.141-146(1952)
4 김성찬, 유홍선, "물분무에 의한 화재제어 특성에 관 한 연구", 설비공학논문집, Vol.15, No.4, pp.261- 267(2003)
5 R. Wighus, "Engineering Relations for Water Mist Fire Suppression Systems", Proceedings: Halon Alternatives Technical Working Conference, pp.397(1995)
6 J.S. Tien, "Diffusion Flame Extinction at Small Stretch Rates: The Mechanism of Radiative Loss", Combustion and Flame, Vol.65, pp.31-34(1986)   DOI   ScienceOn
7 C.E. Lee, S.R. Lee, J.W. Han and J. Park, "Numerical Study on Effect of $CO_2$ Addition in Flame Structure and NOx Formation of $CH_4$ Air Counterflow Diffusion Flames", Int. J. Energy Research, Vol.25, pp.343-345(2001)   DOI   ScienceOn
8 A.E. Lutz, R.J. Kee, J.F. Grcar and F.M. Rupley, "OPPDIF: A Fortran Program for Computing Opposed-Flow Diffusion Flames", Sandia Report, SAND96-8243
9 P. Andersson, M. Arvidson and G. Holmstedt, "Small Scale Experiments and Theoretical Aspects of Flame Extinguishment with Water Mist", Technical Report 3080, Dept. of Fire Safety Engineering, Lund University, May(1996)
10 R. Wighus, "Extinguishment of Enclosed Gas Fires with Water Spray", Proceedings of the Third International Symposium on Fire Safety Science, Edinburgh, Scotland(1991)
11 임용준, 강현욱, 이호석, "도로터널 환기설계시 외부 자연풍 영향에 대한 연구", 기술보고서, Building and Tunnel Technoqlogies Co. Ltd.(2004)
12 J. Hua, J. Kumar, B.C. Khoo and H. Xue, "A Numerical Study of the Interaction of Water Spray with a Fire Plume", Fire Safety Journal, Vol.37, pp.631-657(2002)   DOI   ScienceOn
13 Z. Liu and A.K. Kim, "A Review of Water Mist Fire Suppression Systems - Fundamental Studies", Journal of Fire Protection Engineering, Vol.10, No. 3, pp.32-50(2000)