单坡度V字形隧道火灾中等效纵向风速及温度场研究  

Study on equivalent longitudinal velocity and temperature field in the single slope V-shaped tunnel fire

作　　者：吴东阳 朱宇 殷耀龙 徐志胜[2] Wu Dongyang;Zhu Yu;Yin Yaolong;Xu Zhisheng(Jiangsu Traffic Engineering Construction Bureau,Jiangsu Nanjing,210000,China;School of Civil Engineering,Central South University,Hunan Changsha 410075,China)

机构地区：[1]江苏省交通工程建设局,江苏南京210000 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《消防科学与技术》2024年第9期1309-1315,共7页Fire Science and Technology

摘　　要：火灾发生在水下隧道的变坡点附近时,隧道结构可简化为单坡度V形隧道。在单坡度V形隧道发生火灾时,烟气运动会受到一侧倾斜隧道烟囱效应的影响。采用FDS数值模拟研究方法,对自然通风状态下单坡度V形隧道火灾中的等效纵向风速以及隧道温度场进行研究,并建立了预测模型。结果表明,火灾产生的等效纵向风速与隧道坡高和热释放速率有关,其数值大小与热释放速率的1/3次幂和无量纲坡高成正比;单坡度V形隧道顶板下烟气的最大温升随着坡度的增加而线性递减,整个火灾下游的烟气温度分布呈指数衰减,且坡度越大,纵向烟气温度在火源周围的衰减越明显,衰减曲线也更陡峭。When the fire occurs near the slope change point of the underwater tunnel,the tunnel structure can be simplified into a single slope V-shaped tunnel.The smoke movement of the single slope V-shaped tunnel is affected by the stack effect.In this study,FDS numerical simulation research method is used to study the equivalent longitudinal velocity and tunnel temperature field in the single slope V-shaped tunnel fire under natural ventila-tion and establish a prediction model.The results show that the equivalent longitudinal wind speed generated by fire is related to the tunnel slope height and heat release rate,and its value is pro-portional to the 1/3 power of the heat release rate and the dimen-sionless slope height.The maximum temperature rise of smoke under the roof of a single slope V-shaped tunnel decreases linearly with the increase of slope.The temperature distribution of smoke downstream of the entire fire shows an exponential decay,and the steeper the slope,the more obvious the temperature decay of lon-gitudinal smoke around the fire source,and the steeper the decay curve.

关 键 词：单坡度V字形隧道 烟囱效应 最大烟气温升 烟气温度分布 

分 类 号：X913.4[环境科学与工程—安全科学] TU998.1[建筑科学—市政工程]