摘要
为研究火源空间位置对高层建筑环形走廊安全区域划分的影响,采用PyroSim软件模拟不同火源空间位置下烟气温度、烟气浓度及烟气能见度的变化情况对环形走廊进行安全区域划分的影响。结果表明,火源距离地面竖直高度一定时,由于走廊拐角的卷吸作用,走廊截面交界处的烟气温度和CO体积分数远高于无截面交界处,能见度则远低于无截面交界处,且落入重度危险区域。火源竖直高度越高,走廊拐角处同一位置烟气温度越高,当火源竖直高度上升到90 m时,走廊烟气温度最大增加到270℃。拐角和环形走廊中间部位烟气温度和CO体积分数明显高于其他部位,若无任何排烟措施,对人员逃生非常不利。当火源距离走廊窗口的水平距离一定时,火源距离地面的竖直高度越高,室外风速对走廊安全区域的划分影响越大。安全区域、轻度危险和中度危险区域面积随着火源位置高度的增加而增加,重度危险区域则逐渐减少,且火源位置高度越高,变化趋势越显著。
To study the influence of the fire source space location on the safe zone division of high-rise building circular corridors,PyroSim was used to simulate the influence of the change law of flue gas temperature,smoke concentration,and smoke visibility on the safe zone division of circular corridors under different fire source space positions.The results show that when the fire source is at a certain vertical height from the ground,due to the engulfment of the corridor corners,the smoke temperature and CO volume fraction at the junction of the corridor section are much higher than those at the junction without section,and the visibility is much lower than that at the junction without section and all fall into severely dangerous areas.The higher the vertical height of the fire source is,the higher the smoke temperature at the same location at the corner of the corridor is.When the vertical height of the fire source rises to 90 m,the maximum smoke temperature in the corridor increases to 270℃.The smoke temperature and CO concentration in the corners and the middle part of the circular corridor are significantly higher than in other parts.Without any smoke exhaust measures,it is very unfavorable for personnel to escape.When the horizontal distance between the fire source and the corridor window is constant,the influence of outdoor wind speed on the partition of the corridor safe area increases with increasing the vertical height of the fire source from the ground.The area of safe areas,lightly dangerous and moderately dangerous areas increases with the height of the fire source location,while the severely dangerous areas gradually decrease.The higher the fire source location is,the more significant the trend of change is.
作者
赵江平
储小婷
欧阳的华
ZHAO Jiang-ping;CHU Xiao-ting;OUYANG Di-hua(School of Resource Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2023年第3期756-764,共9页
Journal of Safety and Environment
基金
青海省高原绿色建筑与生态社区重点实验室开放基金项目(KLKF-2020-006)。
关键词
安全工程
火源位置
环形走廊
安全区域
高层建筑
safety engineering
fire source location
circular corridor
safe area
high-rise building
