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“十”字地铁换乘站多点火灾工况下的通风排烟

Keywords: 地铁换乘站,火灾,烟气控制,数值模拟

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Abstract:

以某典型"十"字交叉换乘地铁车站为研究对象,通过数值模拟的方法对换乘车站两站台同时发生火灾的极端情况下不同排烟方案的排烟效果进行了研究,方案1是站厅层送风,地下二层和三层站台分别排烟;方案2是在方案1的基础上,将地下三层的车站屏蔽门打开,利用车站隧道风机进行辅助排烟.火源设计为峰值2MW的时间平方快速火.研究结果表明:两种方案都能有效控制地下二层站台烟气蔓延,方案2中打开地下三层车站屏蔽门,利用车站隧道系统辅助排烟的措施可以有效增加楼梯处的向下风速,同时降低楼梯处烟气温度,延长火源附近楼梯作为人员疏散通道的时间,实现良好的换乘站防烟效果.

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