竖井对地铁隧道自然排烟影响的数值模拟

摘要

采用FDS对地铁隧道火灾时不同的横向火源位置以及不同竖井长宽比情况下自然排烟的效果进行数值模拟研究,分析了隧道内的烟气扩散特性及温度和能见度的分布状况.结果表明,火源位于隧道的不同横向位置只影响近火源区的烟气温度,不会对竖井的排烟效果产生影响;竖井长宽比越大,排烟效果相对越好.结果可为地铁工程排烟设计提供参考.%Using FDS, the numerical simulation was made on effi?ciency of natural ventilation under different fire location and differ?ent length to width ratio of shaft, and the smoke spread characteris?tics, temperature and visibility was analyzed. The results showed that different fire location could affect the temperature near the fire location, the effect of smoke exhausting would not be affected; the larger the length to width ratio of shaft was, the better the smoke exhausting. The results can give references for the smoke exhaust design of subway project.