小曲率半径隧道火灾烟气运动特征
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摘要
搭建小曲率半径曲线和直线隧道模型,利用FDS数值模拟烟气运动,将得到的温度和速度数据分析拟合,对比并讨论不同曲率半径对烟气运动的影响。曲率半径为30～70 m,火源功率为3.4 MW。结果表明:曲线隧道火灾顶棚温度和速度分布符合指数函数,竖直方向温度分布符合高斯分布。曲率半径的存在使热烟气积累,限制热烟气的传播和卷吸,从多方面综合影响烟气运动。
Curved tunnel models with small curvature radii and linear tunnel model were built. The smoke movement was simulated by FDS, and then the temperature and velocity data were analyzed and fitted. The influence of different curvature radii on smoke movement was compared and discussed. The curvature radii were set as 30～70 m and the fire power was 3.4 MW. The results showed that the distributions of ceiling temperature and velocity fit with exponential function, and the distribution of vertical temperature fits the Gaussian distribution. The existence of curvature radius makes hot smoke accumulate, limits its spread and entrainment,and affects the smoke movement in many ways.
Curved tunnel models with small curvature radii and linear tunnel model were built. The smoke movement was simulated by FDS, and then the temperature and velocity data were analyzed and fitted. The influence of different curvature radii on smoke movement was compared and discussed. The curvature radii were set as 30～70 m and the fire power was 3.4 MW. The results showed that the distributions of ceiling temperature and velocity fit with exponential function, and the distribution of vertical temperature fits the Gaussian distribution. The existence of curvature radius makes hot smoke accumulate, limits its spread and entrainment,and affects the smoke movement in many ways.
引文
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[3]张念,谭忠盛.高海拔特长铁路隧道火灾烟气分布特性数值模拟研究[J].中国安全科学学报,2013,23(6):52-57.
[4]胡亚伟,李英姿.基于FDS地铁直线盾构隧道火灾温度探测模拟研究[J].北京建筑大学学报,2015,31(3):50-53.
[5]MUHASILOVIC M,DEVILLE M O.Tunnel-Curvature’s influence on the propagation of the consequences of large-scale accidental fire-a CFD investigation[J].Turkish Journal of Engineering and Environmental Sciences,2008,31(6):391-402.
[6]KASHEF A,SABER H H,GAO L.Optimization of emergency ventilation strategies in a curved section of a road tunnel[J].Fire Technology,2009,47(4):1019-1046.
[7]CALIENDO C,CIAMBELLI P,DE GUGLIELMO M L,et al.Fire simulation of a bus in road tunnel[J].Tunnelling and Underground Space Technology Incorporating Trechless Technololgy Research,2013,37:22-36.
[8]CALIENDO C,CIAMBELLI P,DE GUGLIELMO M L,et al.Numerical simulation of different HGV fire scenarios in curved bidirectional road tunnels and safety evaluation[J].Tunnelling and Underground Space Technology,2012,31:33-50.
[9]王峰,董国海,王明年.曲线隧道火灾烟气控制临界风速的研究[J].现代隧道技术,2015,52(5):84-89.
[10]刘明.弧形公路隧道临界风速数值模拟研究[J].消防科学与技术,2016,35(12):1706-1707.
[11]王峰,董国海,王明年.曲线隧道火灾烟气控制临界风速的研究[J].现代隧道技术,2015,52(5):84-89.
[12]李铃.基于FDS的室内火灾动力学研究[J].科技信息,2011,36:430-432.
[13]霍然,胡源,李元洲.建筑火灾安全工程导论[第二版][M].合肥:中国科学技术大学出版社,2009:116.
[14]毛军,郗艳红,樊洪明.地铁隧道列车火灾的火焰顶棚射流温度特性研究[J].土木工程学报,2010,43(2):119-126.
[15]李立明.隧道火灾烟气的温度特征与纵向通风控制研究[D].合肥:中国科学技术大学,2012.
[16]邹继辉.小半径曲线公路隧道火灾温度模拟及烟气控制研究[D].长沙:中南大学,2015.