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地铁站是一类特殊的地下建筑形式,其各层均为狭长型结构,且各层之间存在一定的高度差,火灾发生后烟气的流动规律较一般的建筑特殊,因此,研究排烟设施的设计参数对排烟效果的影响具有重要的意义。本文首先介绍了深圳地铁会展中心站的基本情况,在作者之前理论分析、小尺寸模型实验、全尺寸实验的基础上,运用数值模拟方法对排烟口高度对地铁机械排烟效果的影响进行了模拟研究。研究结果表明:在不同排烟口高度下,防烟分区距离火源位置越远,烟气扩散到该防烟分区的时间差越大;随着排烟口高度的升高,地铁站内机械排烟效果得到了改善。
Subway station is a special type of underground construction, all of its layers are long and narrow structures, and there is a certain height difference between the layers. After the fire, the flow of flue gas is more special than that of ordinary buildings. Therefore, The design parameters of the facility have an important impact on the smoke exhaust effect. This paper first introduced the basic situation of Shenzhen Metro Convention and Exhibition Center Station. Based on the author’s previous theoretical analysis, small-scale model experiments and full-scale experiments, the effects of exhaust port height on the mechanical smoke exhaust emission of subway were studied by numerical simulation Simulation study. The results show that at different height of smoke outlet, the farther the smoke prevention zone is located from the fire source, the larger the time difference of smoke diffusion to the smoke prevention zone; with the height of the smoke outlet increasing, The effect has been improved.