高层建筑走廊机械排烟效果影响因素分析

Analysis of factors influencing mechanical smoke exhaust in corridor for high-rise buildings

通过FDS软件对高层建筑火灾进行实况模拟,结合模拟所得数据分析单排量、排烟口位置、排烟口数量、起火房间位置等不同因素对机械排烟效果的具体影响。结果表明:单位面积排烟量的提高可以加快烟气的排出;排烟口设于顶棚比侧壁排烟效果更为稳定,实际中吊顶高度在2 m以下时,不宜采用侧壁排烟。本模型中,条形走廊机械排烟受排烟口数量约束不大,但对于其它格局的建筑结论或许不同。对于条形走廊,排烟量相同,起火房间位于两排烟口之间位置时排烟效果相对较好。

A live simulation is performed by using FDS software for high-rise building fires. Specific effects on mechanical smoke effect are discussed combined with the effects of different factors simulating specific single displacement, exhaust port location, number of discharges, fire room location and other mechanical smoke effect resulting data. The results show that increasing the amount of smoke per unit area can speed up the ex-haust fumes;the effect is more stable for the smoke exhaust port located on the roof than that of smoke exhaust port located on the side wall. When the ceiling height is less than 2m, sidewalls smoke exhaust should not be adopted. In this model, straight corridor mechanical exhaust is not constrained by the amount of the exhaust ports, but it might be different for the other buildings. For the bar corridor, with the same amount of smoke, when the room on fire is located between the two exhaust ports, the smoke exhaust is relatively better.