摘要
针对某特长沉管公路隧道采用侧向集中排烟系统的实际,采用FDS对隧道内温度场分布、2m高处能见度分布、烟气蔓延范围、排烟效率等指标进行定量分析,获得合理的烟气控制方案。结果表明:火源位于-3%坡度段内,火源功率50MW的合理纵向诱导风速为2.5m/s,合理排烟口开启方案为上游开启1组/下游开启4组排烟口;0坡度段合理的烟控方案为两端排烟,上游开启2组/下游开启3组排烟口,并配合1.5m/s的纵向诱导风速;3%坡度段合理的烟控方案为下游端排烟,上游开启2组/下游开启3组排烟口,并配合1m/s的纵向诱导风速。
Lateral central extraction system was applied in a su- per long immersed road tunnel. For the smoke control engineer- ing practice, temperature distribution, 2 m height visibility con- ditions, smoke spread range, as well as exhaust efficiency and other smoke effect indicators were quantitatively analyzed by FDS. The results showed that： when the fire source is located in -3% slope segment, fire power as 50 MW, reasonable lon- gitudinally induced velocity is 2.5 m/s and the reasonable ex- haust inlets opening solution is 1 upstream exhaust inlet / 4 downstream exhaust inlets. When the fire source is located in 0% slope segment, reasonable exhaust program is two-way bal- anced smoke exhaust, and 2 upstream opened exhaust inlets / 3 downstream opened exhaust inlets. At the same time the rea- sonable longitudinally induced velocity is 1.5 m/s. When the fire source is located in 3% slope segment, reasonable exhaust program is one-way smoke exhaust towards the downward, and 2 upstream opened exhaust inlets / 3 downstream opened ex- haust inlets. At the same time the reasonable longitudinally in- duced velocity is 1 m/s.
出处
《消防科学与技术》
CAS
北大核心
2013年第8期837-840,843,共5页
Fire Science and Technology
基金
湖南省科技计划项目"公路隧道火灾点式排烟系统关键技术研究"(2012GK3169)
北京市博士后工作经费资助项目(2013ZZ-02)
灭火救援技术公安部重点实验室开放课题(KF2011003)
关键词
公路隧道
侧向集中排烟
烟气控制
数值模拟
immersed road tunnel
lateral central extraction sys- tem
Smoke control
numerical simulation
