Smoke confinement utilizing the USME ventilation mode for subway station fire

Experiment and numerical simulation were performed to research the possibility of adopting different ventilation modes for smoke confinement in a subway station fire accident. Bench scale experiments were conducted in a 1:50 scale model of a subway station. Fire Dynamics Simulator software (FDS) was utilized to carry out numerical simulations, which conducted in a full scale subway station. Experiment result agreed well with simulation result and the research showed that the different ventilation mode had different efficacy of smoke confinement released by the fire in basement 2. In addition, when the USME ventilation mode was adopted and there were smoke exhausted from basement 2 and air supplied into the basement 1, the efficacy of smoke confinement was the best. According to these cases conducted in this paper, the layouts of the ventilation vents had little influence on the efficacy of smoke confinement. Once the HRR was too big, the concentration would pass 50 PPM and the amount of exhausted smoke should be increased.