地铁长大区间隧道火灾风机启动方案数值模拟研究

Study on numerical simulation of fan startup schemes for fire in long-large internal tunnel of subway

为了研究地铁长大区间隧道火灾烟控模式,以国内某一在建地铁长大区间隧道为研究案例,选取不利起火位置,设置了7种风机启动方案,研究不同风机启动方案下,隧道内顶棚温度,疏散平台人员高度烟气温度、CO浓度、可见度的变化,获得不同风机启动方案情况下排烟效果。研究表明:当开启了火源附近足够数量的送风风机后,额外增加距离火源较远的送风风机并不会显著改善排烟效率;即使开启风机台数一致,开启火源所在区段两端的风机效果明显好于开启其他风机。

To study the smoke control mode for the fire in long-large internal tunnel of subway,taking a domestic long-large subway internal tunnel under construction as example,the adverse fire source location was selected,and seven different fan startup schemes were investigated. The ceiling temperature,and the smoke temperature,CO concentration and visibility at the evacuation personnel height in the tunnel under different fan startup schemes were studied,and the corresponding smoke exhaust effect were obtained. The results showed that when the air supply fans around the fire source were started with enough quantity,starting more air supply fans far away from the fire source would not improve the smoke exhaust efficiency significantly. Starting the fans on both ends of the interval where the fire source existed had much better effect than starting other fans even though the same number of fans were started.