摘要
基于FDS火灾模拟软件对不同纵向风速作用下隧道单喷淋与双喷淋灭火系统于烟气沉降作用研究分析。通过引入无量纲T/T aver参数,对烟气层化强度和层化曲线进行分析。结果表明:喷淋系统对隧道降温作用明显,喷淋头位置、数量也会对烟气层的稳定带来影响,双喷头位于隧道两侧对烟气层稳定影响较小。同时风速大小会影响烟气层化强度和层化曲线,风速较低(0 m/s<V≤0.5 m/s)时单、双喷淋工况烟气分层基本相同;当风速(1 m/s<V≤2 m/s)时双喷淋层化强度最大、烟气分层效果更佳;当风速大于等于临界风速(V=2.3 m/s)时烟气层稳定遭到破坏,无明显分层现象。
Based on the FDS fire simulation software,the effect of the single spray and double spray fire extinguishing system on the smoke flow of the tunnel under different longitudinal ventilation speeds is analyzed.By introducing nondimensional T/T aver parameters,the stratification intensity and strati-fication curve of smoke flow are analyzed.The results show that the sprinkler system has a significant effect on the cooling of the tunnel.The position and number of sprinklers will also affect the stability of the flue gas layer.The double sprinklers located on both sides of the tunnel have little effect on the stability of the flue gas layer,compared with the single spray system.At the same time,the wind speed will affect the stratification intensity and stratification curve of the flue gas.When the wind speed is relatively low(0 m/s<V≤0.5 m/s)flue gas stratification is basically the same in single and double spraying conditions.When the wind speed(1 m/s<V≤2 m/s),the double spray stratification intensity is better than the single spray system.When the wind speed is higher than or equal to the critical wind speed(V=2.3 m/s),the stability of the flue gas layer is destroyed,and there is no obvious stratification.
作者
陈溢彬
许秦坤
CHEN Yibin;XU Qinkun(School of Environment and Resources,Southwest University of Science and Technology Mianyang,Sichuan 621010)
出处
《工业安全与环保》
2021年第7期5-10,共6页
Industrial Safety and Environmental Protection
关键词
纵向风速
隧道喷淋系统
烟气热分层
隧道火灾
longitudinal ventilation
tunnel sprinkler system
flue gas thermal
stratification tunnel fire
