A numerical study of water mist mitigation of tunnel fires
作者： F. Nmira , J.L. Consalvi , A. Kaiss , A.C. Fernandez-Pello , B. Porterie
DOI: 10.1016/J.FIRESAF.2008.06.002
关键词: Extinguishment 、 Environmental engineering 、 Spray characteristics 、 Turbulence 、 Water flow 、 Firefighting 、 Mist 、 Soot 、 Environmental science 、 Poison control 、 Mechanics
摘要: A Eulerian–Eulerian two-phase model is developed to numerically investigate the efficiency of water mist systems in mitigating thermoplastic fires a tunnel. The polydisperse nature spray modeled using moments droplet size distribution function. system Favre-averaged Navier–Stokes equations for gas phase closed k–eRNG turbulence model, Eddy-Break-Up–Arrhenius turbulent combustion, and multiphase radiative transfer equation including contributions soot, combustion products, droplets. parametric study carried out assess influence injection conditions spray, ventilation on fire mitigation Ventilation velocity range 1–2 m/s flow rate 0.01–0.3 kg/s. Model results show that mainly related dynamics optimum characteristics and/or extinction are highly dependent configuration. It found extinguishment occurs during transient stage at relatively high rates as consequence sharp decrease fuel pyrolysis rate. If does not occur, then resulting from fire/water interaction tends rapidly toward quasi-steady state. With an increasing rate, exhibits asymptotic behavior steady Keywords: Water mist; Thermoplastic fire; Tunnel; Numerical model; Polydisperse spray; Moment method
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