耦合因素对高层建筑疏散走廊排烟效果的影响

Smoke exhausting efficiency from corridor of high-rise building vs coupled factors

为研究不同机械排烟量与室外风速耦合作用对核心筒高层建筑疏散走道内排烟效果的影响,利用1∶3缩尺核心筒高层建筑火灾烟气模拟试验台,对11种工况下高层建筑环形走廊的机械排烟效果进行小尺寸模型试验,选取距走廊地面0. 7 m处的热烟气层温度、热烟气层高度和烟气蔓延速度作为评判人员是否安全的3个指标,确定保证疏散走廊内人员较为安全的最佳机械排烟量和室外风速。结果表明:当室外风速分别为0、1和2. 5 m/s时,保证疏散走廊相对安全的机械排烟量分别为6 000、8 000和14 000 m^3/h。

To study the mechanical smoke exhausting efficiency from ring corridor of core tube high-rise building under the coupled effect of different mechanical smoke exhaust volume and outdoor wind velocity,experiments were carried out under 11 conditions by using a 1∶3 scale-down experimental set-up.The optimum mechanical exhaust smoke volume and outdoor wind velocity were obtained by considering smoke layer temperature,smoke layer height,and smoke spread velocity in height of 0.7 m in the corridor.The experimental results show that when the values of outdoor wind speed are 0,1 and 2.5 m/s,the values of mechanical exhaust smoke volume ensuring the safety of people in ring corridor of core tube high-rise building should be 6 000,8 000 and 14 000 m^3/h respectively.