A Simulation And Study In Meigulin Road Tunnel Using Longitudinal Ventilation System

With expeditiously development of national economy, construction of roadtraffic with security and comfortable circumstances are becoming more important.Due to the increase of tunnel's length and quantity, and the increase of density ofroad traffic, fatalness of fh-e in a roadway tunnel are rising gradually. Therefore,ventilation in a road tunnel becomes extremely important. Until now, ourinvestigation and research in this field is far behind abroad, and is badly hinderingthe tunnel construction. The most recent technique to Study the longitudinal ventilation system fortunnel is by using Computational Fluid Dynamics (CFX5.5), It is very difficult tostudy the ventilation system because of the ratio of manet's length and width. In thispaper, the basic and important parts are studied. For example, the Capacity of Jet Fanin tunnel,the flux distribution and resistance loss in the chimney. This approach iscapable of modeling multi-dimensional, time dependent nature of fire in a roadtunnel, this paper presents the critical ventilation velocity in various heat release rateand smoke release rate for Jingfu highway. An emergency fire in a tunnel induced bya traffic accident is sometimes hard to control the propagations of smoke. If a f'trehappens in the middle or portal tunnel, the detailed predictions of CFD modelsprovide the necessary analysis capability for suitably designing and operatingventilation systems. The achievements of this paper enrich the analysis of tunnelventilation in three dimensional and time dependant simulation and provide goodreference for practical design.