Subway Station Fire CFD Simulation Is Based

This paper is based on a metro line project under construction in Kunming. A standard layer-2-underground-floors island station was selected as the study object of the subway station fire. The GAMBIT software was used to build the geometric model of the standard layer-2-underground-floors island station, and the FLUENT software was used to simulate the station fire and the platform tunnel train fire. By the simulation analysis of the distribution of the characteristic parameters of the flue gas temperature inside the station under fire conditions, toxic gas concentration and velocity field, it came to a conclusion of the lateral and vertical proliferation law of the flue gas in the subway station fire, which provided the basis for safe evacuation. The content of the main research, research results and conclusions of this paper are as follows.By the analysis of statistics from the subway disasters at home and abroad, we got the following conclusions. Fire accidents happened the most in number and had the largest number of casualties of all subway accidents occurred. Once the particularly serious fire happened, it would cause huge casualties. The direct reason of casualties was due to the toxic smoke.The study of the subway fire prevention was consisted of three main areas. They are the entity experimental research, the model experiment and the computer simulation. Predecessors used CFD software to simulate the subway station fire. That numerical simulation analysis were started from three main aspects, the platform fire, the hall fire and the tunnel train fire, which based on the forms of the subway platform, with or without the platform screen doors, the position of fire, etc.The detailed analysis of the building structure, the ventilation and smoke exhaust system, the operation of the smoke exhaust system in the fire conditions of the standard layer-2-underground-floors island station was carried out in this paper. The subway platform fire and the tunnel train fire was selected as the main contents of the subway station fire simulation. And a three-dimensional model of the subway station was built by using the GAMBIT software. The luggage fire on subway platform was simulated by the FLUENT software in this paper. The Fire located at a site in the central platform and powered up to2.5MW of t2-a constant source of fire. The top flue fan on both sides of the tunnel rail in the station was used as the ventilation and smoke exhaust model. And the gas diffusion process was based on fan-assisted smoke exhaust system in the interval tunnel. We found the distribution of the characteristic parameters of the flue gas temperature, the concentration of toxic gases and the velocity field in station. By the analysis of the numerical simulation results, it was drawn that after the station fire in the selected stand layer-2-underground-floors island station, opening the station ventilation and smoke exhaust system could ensure the safe evacuation of personnel, which meets the requirements of the code for design of metro.The tunnel train fire on subway platform was simulated by the FLUENT software in this paper. The Fire located at a site in central platform and powered up to7.5MW of t2-a constant source of fire. The top flue fan on the on-fire side of the tunnel rail in the station was used as the ventilation and smoke exhaust model. And the gas diffusion process was based on fan-assisted smoke exhaust system in the on-fire interval tunnel. We found the distribution of the characteristic parameters of the flue gas temperature, the concentration of toxic gases and the velocity field in station. By the analysis of numerical simulation results, it was drawn that after the station fire in the selected stand layer-2-underground-floors island station, opening the tunnel train station ventilation and smoke exhaust system could ensure the safe evacuation of personnel, which meets the requirements of the code for design of metro.