I Numerical Investigation on the Effect of Mobile Smoke Ventilator on Fire-induced Smoke Extraction for Underground Platform in a High-speed Railway Station

摘要

Fire-induced smoke extraction for the underground platform of a high-speed railway station was investigated. Nowadays, the development of high-speed railway in China is rapid. In order to economize valuable urban space and to realize the convenient interchange to the subway, some of the high-speed railway station platforms and transfer halls are set underground. It is difficult and uneconomic to achieve static ventilation in the underground platform. Therefore, the mechanical smoke control system is the most feasible method to ensure the fire safety of the underground platform. Mobile smoke ventilator is the most common smoke exhaust equipment for fire-fighters. This paper investigates the interaction between mechanical smoke control system and mobile smoke ventilator, as well as the effect of mobile smoke ventilator under the condition of mechanical smoke control system failure. An underground island platform and underground waiting and transfer halls of an under construct high-speed railway station in south China are reconstructed in this paper. A new system with mechanical ventilation and mobile smoke ventilator is proposed. The effects of mechanical ventilation without mobile smoke ventilator are also numerically simulated by Computational Fluid Dynamics (CFD) method for comparison. The distribution of smoke and CO in the platform and influences of them on evacuation staircases are computed and analyzed. The effect of fire location on smoke spread is explored in our research. This study based on CFD modeling enables the improvement of smoke control and exhaust in underground high-speed railway station fire. The results are applicable to practical fire-fighting and rescue for underground high-speed railway station platform.