| 21st will be the underground buildings' century. Subway will be launched into use as an important traffic tool in many big and middle cities. But the subway fire has the more dangerous. For all these reasons, the status of mechanism ventilation under fire are selected as the subject of this paper, which will be meaningful to the performance-based fire protection design in underground ventilation, and hope to be helpful to the research of how to control the underground fire .The paper uses Qianmen station as the research object, which is a representative station of Beijing. The proper ventilation design including opening size, location and airflow rate were therefore identified for the assist of the mechanical ventilation system design. The paper studies the mechanical ventilation conditions of island style platform, and bases on the simulation results gives the better ventilation scheme.This paper's reseach method is mainly computer simulation. Although the data of entity dimension experiment is the best, but the experiment will cost long time, and the fire can't be replicated. The small-proportional experiment can only be used in qualitative research, and using the experimental data has localization. So we adopt some predigest measure, strive to find better projection, in order to simulate the ventilation which can't be carry out because of condition restrict.The paper adopts the N-Percentage and evacuation fomula to provide the boundary conditions and the numerical value of the simulation. FDS is used to simulate the subway's ventilation and smoke managenment under fire, solved the problem of best ventilation mode under fire. The results show that the smoke spreads quickly and the temperature ascend fast under the case of unmechanical-ventilation form. The ventilation system has effective function. The best ventilation form is using mechanical air supply form far from the fire, and using mechanical smoke extraction form close to fire. It can ensure that the smoke... |
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