Abstract
The smoke movement in the subway tunnel with train under different longitudinal ventilations was simulated using Fire Dynamics Simulator (FDS) program in this paper. The influence of subway train on the characteristics of smoke flow, including the smoke temperature underneath the tunnel ceiling and back-layering length, were investigated. The results showed that the upstream smoke gas temperature was much lower with train than without when the ventilation velocity was lower than the critical value and the downstream dimensionless smoke gas excess temperature decayed exponentially. The subway train could contribute to reduce the back-layering length at low ventilation velocities. Meanwhile, the FDS simulated smoke back-layering length agreed well with the calculated values of the proposed model. However, the difference between train lengths of 20 m and 40 m was insignificant. The mechanism of the train influence was discussed in depth using hydrodynamics.
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