Simulation of Metro Train Fire in an Underground Station of Tehran Metro Line 7

In this research a fire scenario was simulated in one of the stations of the line 7 of Tehran's subway system. The Line 7 is under construction and the ventilation system is under design. Fire was set for a stopping metro train at the platform of the station. A 160 meter length eight-car metro train with the forth wagon on the fire was studied. The heat release rate is based on a quadratic function with the maximum of 10 MW. The Fire Dynamic Simulator (FDS) software was used for fire simulation, in which, the Large Eddy Simulation (LES) method is performed to analyze the flow field. The combustion is based on the mixture fraction model. The designed ventilation system for smoke evacuation was evaluated with setting related boundary condition for the studied computational domain. The results for the temperature, concentration of CO and soot for all the locations in the platform area were obtained. The results depict that when the smoke ventilation system is on operation, the height of smoke is on a safe limit; moreover, the concentrations of CO is much lower than the limit reported for a safe evacuation of passengers from platform area.