| With expeditiously development of national economy, construction of road traffic are becoming more important. Due to the increase of tunnel' s length and quantity, and the increase of density of road traffic, fatalness of fire in a roadway tunnel are raising gradually. Therefore, ventilation in a fire emergency in a roadway tunnel becomes extremely important. Until now, our investigation and research in this field is far behind abroad, and is badly hindering the tunnel construction.Located in the Sichuan province, Erlang mountain road vehicle tunnel is a crucial traffic passage. No matter in the wartime or in the peacetime, Erlang mountain road tunnel have many potential fire dangers. Hence, it is necessary that we should find out the effective and available scenario of fire ventilation to control the longitudinal velocity exceeding the "critical velocity" and push all of the smoke out of the tunnel. The work here has a lot of application and stringency.For the first time, the various ventilating methods and effects to control the smoke in a fire emergency of the Erlang Mountain tunnel semi-transient ventilation road tunnel are presented. With the hypothesis of one-dimensional steady ideal fluid, the experimental and numerical studies are presented. Computational Fluid Dynamics (CFD) techniques are used to study and understand fluid behavior in tunnels. By simulating complex specific operational cases, we can educe velocity or flux distribution in tunnel under different ventilation and resistance situation and determine the favorable operational procedures of the Erlang Mountain tunnel ventilation in a fire case. Comparison has been made between a simulation and experiment for some cases in order to prove the CFD model is powerful, so that enables the study of cases for which experimental data is not available. The analysis of results is also valuable for designing, researching and operating of other semi-transient ventilating road vehicle tunnel.
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