排烟挡板对站台火灾机械排烟效果影响

为了有效解决地铁站台火灾机械排烟中的烟气吸穿问题,本文以侧向地铁站台为例,提出在排烟口底部加装排烟挡板的方法来阻止烟气层吸穿现象的发生。采用火灾模拟软件FDS对不同工况下站台内烟气温度、排烟口流场结构、CO体积流量进行了数值模拟分析。结果表明设置排烟挡板后,能够有效地限制吸穿现象的发生,提高站台机械排烟量。排烟挡板的设置对排烟效果也有显著影响,结果表明挡板在距离排烟口0.35m处时,排烟口处无低温凹陷区域,排烟效果最佳；而增大排烟挡板的尺寸,也能改善机械排烟效果。

Study on The Effect of Smoke Exhaust Baffle on Mechanical Smoke Exhaust Effect of Platform Fire

In order to effectively solve the plug-holing problem in the mechanical smoke exhaust of subway station fires, this paper takes the lateral subway station as an example, and proposes to install smoke exhaust baffle at the bottom of the smoke exhaust vent to prevent the plug-holing phenomenon from penetrating. The fire simulation software FDS was used to simulate the smoke temperature, the flow field structure and the CO volume flow in the platform under different working conditions. The results show that after the exhaust baffle is installed, the occurrence of plug-holing phenomenon can be effectively restricted, and the mechanical exhaust amount of the platform can be improved. The setting of the exhaust baffle also has a significant effect on the smoke exhausting effect. The results show that when the baffle is 0.35m away from the exhaust vent, there is no low temperature recessed area at the exhaust vent, and the smoke exhausting effect is the best; the size also improves the mechanical exhaust effect.