摘要
采用数值计算方法,考虑热释放速率、排烟量、排烟口间距、排烟口面积、尺寸比和隧道高度,研究隧道火灾重点排烟系统下烟气蔓延距离、温度分布、排烟口风速和排烟效率。结果表明:火灾烟气蔓延距离随排烟量的增大而缩短,隧道顶棚温度下降;在排烟量不变的条件下,更大的排烟口宽长比能够缩短烟气蔓延距离;而排烟口间距的变化对排烟效率影响不明显。基于研究结果,给出了5 MW和20 MW火源功率下的重点排烟系统排烟量和排烟口布置建议值。
Numerical simulation was implemented to study the smoke spread distance,temperature distribution,smoke exhaust velocity and exhaust efficiency by considering the variation of the heat release rate(HRR),interval of the adjacent exhaust vents,exhaust volume,exhaust vent dimension and tunnel height.The results indicate that the under a given HRR fire-induced smoke spread distance in the point extraction system is shortened as the smoke extraction volume increases,and the ceiling gas tempera-tures decrease.Besides,under a certain smoke extraction vol-ume,a larger aspect ratio of the smoke vent can control the smoke within a shorter distance.It is also found that the interval of adjacent vent has slight effect on the smoke exhaust efficiency.Based on the results obtained in this work,the suggested values of the smoke exhaust volume and arrangement of the exhaust vent for the fire of 5 MW and 20 MW are given.
作者
申哲玮
郭庆华
李兴莉
Shen Zhewei;Guo Qinghua;Li Xingli(School of Applied Science,Taiyuan University of Science and Technology,Shanxi Taiyuan 030024,China;School of Safety and Emergency Management Engineering,Taiyuan Uni-versity of Science and Technology,Shanxi Taiyuan 030024,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第2期189-196,共8页
Fire Science and Technology
基金
国家自然科学基金青年项目(52208408)
山西省回国留学人员科研教研资助项目(2022-159)
太原科技大学博士科研启动金项目(20232014)
山西省优秀来晋博士科研资助项目(20232043)。
关键词
隧道火灾
重点排烟
排烟量
排烟口尺寸
排烟效率
tunnel fire
point extraction system
smoke extraction volume
extraction vent dimension
smoke exhaust efficiency
