堵塞效应下隧道火灾临界风速研究  

Study on calculation of critical wind speed of tunnel fire under blocking effect

作　　者：赵香玲[1] 梅华[2] 王丰仓[1] Zhao Xiangling;Mei Hua;Wang Fengcang(Shaanxi Railway Institute,Shaanxi Weinan 714000,China;School of Civil and Architecture Engineering,Hunan Institute of Technology,Hunan Hengyang 421002,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]湖南工学院土木与建筑工程学院,湖南衡阳421002

出　　处：《消防科学与技术》2022年第11期1491-1496,共6页Fire Science and Technology

基　　金：陕西铁路工程职业技术学院科研基金项目(KY2018-05)。

摘　　要：为获取更为准确的隧道火灾临界风速算法,考虑火源阻塞比φ_(1)、火源上游处阻塞比φ_(2)均为0、0.23、0.41、0.64,选取了1.6,3.2,9.3 kW三种火源热释放率,通过正交数值试验计算了48种阻塞工况的临界风速值,推导了单纯火源阻塞、单纯火源上游阻塞、火源与上游同时阻塞时临界风速无量纲修正算法。研究结果表明:无论是增加火源处阻塞比还是加大火源上游阻塞比,临界风速值都会逐步减小,火源处阻塞对临界风速的影响更大。火源热释放率增加,临界风速也不断增大。仅火源处阻塞时,临界风速与(1-φ_(1))^(2/3)成正比。仅火源上游阻塞时,临界风速与(1-φ_(2))^(1/3)成正比。火源与上游同时阻塞时,临界风速与(1-φ_(1))^(2/3)(1-φ_(2))^(1/3)成正比。In order to obtain a more accurate critical wind speed algorithm for tunnel fire,the fire source blocking ratioφ_(1)is considered in this study,blockage ratio upstream of fire sourceφ_(2)are set of 0,0.23,0.41 and 0.64,and the heat release rates of 1.6,3.2 and 9.3 kW fire sources are selected.The critical wind speed values under 48 blocking conditions are calculated through orthogonal numerical experiments.The dimensionless correction algorithm of critical wind speed under simple fire source blocking,simple fire source upstream blocking and simultaneous blocking of fire source and upstream is deduced.The results show that whether the blockage ratio at the fire source is increased or the blockage ratio upstream of the fire source is increased,the critical wind speed will gradually decrease,and the blockage at the fire source has a greater impact on the critical wind speed.As the heat release rate of fire source increases,the critical wind speed will also increase.When only the fire source is blocked,the critical wind speed is proportionate to(1-φ_(1))^(2/3).When only the upstream of the fire source is blocked,the critical wind speed is proportionate to(1-φ_(2))^(1/3).When the fire source and upstream are blocked at the same time,the critical wind speed is proportionate to(1-φ_(1))^(2/3)(1-φ_(2))^(1/3).

关 键 词：隧道火灾 临界风速 堵塞效应 数值计算 

分 类 号：X913.4[环境科学与工程—安全科学] U45[建筑科学—桥梁与隧道工程]