| On the basis of analysis the combustion of mine fire and the reason of flow disorder withinfire period, using three-dimensional transient numerical simulation on development process offume behavior when fire occurs in tunnel using Computational Fluid Dynamics.Analysis the reason of airflow reversal when the tunnel occur fire firstly, then fix theconcept of thermal drag theoretically and derivation the formula of fire resistance. The paperintroduces mathematical model of tunnel fire simulation. The finite volume method was used todiscrete the governing equations. The calculation result of numerical simulation indicates that theproposed fire model is reasonable. Then, the development law of temperature field, velocity fieldand temperature field of fire tunnel is analyzed. According to after a fire in tunnel，nearby thefire area, the phenomenon of the smoke along the roof abandoned against air flow to a section ofdistance, through the simulation method, analysis of the factors which influence the length ofcountercurrent smoke layer, such as inlet velocity, fire heat release rate、equivalent diameter oftunnel. According to the results of analysis, we can get the calculation formula of the length ofcountercurrent smoke layer. |
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