基于因次分析的隧道火灾临界风速研究  

Tunnel fire critical ventilation velocity based on dimensional analysis

作　　者：赵望达[1] 李洪[1] 徐志胜[1] 谢晓晴[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2009年第6期18-21,共4页Journal of Railway Science and Engineering

基　　金：铁道部科技研究开发计划项目(2006G007-C-1);中南大学研究生教育创新工程项目(2009ssxt123)

摘　　要：用因次分析法建立了临界风速与相关参数的关系式,导出了临界风速无因次准则的表达式。以狮子洋隧道为载体建立隧道模型,在坡度为0、不同火灾热释放速率、不同通风风速情况下进行数值模拟,获得不同火灾热释放速率时的临界风速。在此基础上,以不同火灾热释放速率对应的临界风速为条件进行数值模拟得到火源上方烟气的温度。将所得的数据代入关系式进行拟合,给出了一种新的临界风速计算公式。The dimensionless criteria expression of critical ventilation velocity was derived. Basd on Shiziyang tunnel, a new tunnel model was set up and was simulated under different ventilation velocities on the situation of 0 gradient, from which critical ventilation velocity of different fire heat release rates was obtained. On the basis of the obtained speeds, numerical simulation was carried out under different fire heat release rates and corresponding critical ventilation velocity. Smoke temperature above the fire soure was obtained. A new critical ventilation velocity formula was presented by analyzing plots mapping according to the obtained data.

关 键 词：因次分析 临界风速 隧道火灾 数值模拟 

分 类 号：X932[环境科学与工程—安全科学]