地下公交站火灾烟气运动数值模拟

摘要

The status and fire risk of underground bus station were expatiated.Based on FDS, the smoke movement in different conditions of sprinkler and exhaust were simulated.The smoke movement in underground bus station and smoke control effects of the sprinkler and exhaust were discussed.Results showed that: temperature increases faster at the location near the wall than that far from the wall, while the visibility decreases faster too; visibility reaches the risk threshold first; sprinkler plays an important role in the smoke control; smoke exhaust can't stop the smoke from lowering when the sprinkler fails.%阐述地下公交站的现状及火灾危险性.利用FDS软件对不同喷淋和排烟设置下的烟气运动进行模拟,分析烟气运动规律及喷淋和排烟在烟气控制方面的作用.结果表明:靠近外墙体的监测点较之远离外墙体的监测点温度上升更快,能见度下降也更快;能见度通常领先其他火灾参数到达危险状态;喷淋系统在控制烟气蔓延上具有显著作用;喷淋失效时,单凭排烟量不足以阻挡烟气下降.