集中排烟隧道火灾烟气扩散特性研究

发布时间：2018-01-03 19:19

本文关键词：集中排烟隧道火灾烟气扩散特性研究　出处：《山东建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：伴随着我国综合国力的增强,在隧道建设方面也迅速发展,集中排烟隧道逐渐成为公路隧道建设的主体,相较于纵向通风隧道,集中排烟隧道控制风速小于纵向通风控制风速,能够最大程度上的维持烟气的自然沉降,利于人员逃生。顶板热参数、空间内的温度场、浓度场分布对于隧道衬砌结构的设计、人们的逃生有至关重要的影响,相关的温度衰减、浓度衰减值得讨论。本文通过建立集中排烟通风隧道逆流区两区域模型,根据守恒原理建立稳态微分方程并求解,得到火源上游区域无量纲烟气流动微分方程,进一步分析烟气逆流距离影响因素。选取甲烷为燃料,针对油罐车火灾,考虑居中、近壁2种不同火源位置,利用CFD软件,预测不同射流风机送风和排烟风机排烟组合下,集中排烟隧道近火源隧道顶板热参数,并整理得到顶板下方最高烟气温度、浓度及其位置、火焰长度随上游无量纲送风速度、下游无量纲诱导风速变化的无量纲准则关联式；研究集中排烟隧道火灾烟气扩散特性,分析隧道内火源上游、下游的温度、浓度水平衰减及垂直衰减,整理得到3个风口位置处的温度、浓度的水平衰减幅度和垂直衰减幅度及其关系,并整理得到相应参数随上游无量纲送风速度、下游无量纲诱导风速变化的无量纲准则关联式。最后,关于进一步工作的方向进行了简要的讨论。
[Abstract]:Along with China's overall national strength, but also the rapid development in the tunnel construction, centralized smoke tunnel have gradually become the main body of the highway tunnel construction, compared with the longitudinal ventilation tunnel, centralized smoke control velocity less than longitudinal ventilation velocity, to the maximum extent possible to maintain the natural sedimentation of flue gas, to escape. The roof thermal parameters. The temperature field in the space, the concentration field for the design of tunnel lining structure, has the very important influence to people's escape, the decay of the temperature, concentration of attenuation is worthy of discussion.
In this paper, a two region model of central exhaust ventilation tunnel is established. Based on the conservation principle, a steady differential equation is established and solved. The dimensionless flue gas flow differential equation in the upstream area of the fire source is obtained, and the influencing factors of the flue gas countercurrent distance are further analyzed.
Methane as fuel for the tanker fire, considering the middle, 2 different fire position near the wall, using CFD software, combined forecasting of wind and smoke exhaust fan to send different jet fan, centralized smoke tunnel near fire tunnel roof thermal parameters, and get the roof below the maximum smoke temperature, concentration and the position of flame as the length of the upper dimensionless air velocity, the dimensionless correlation criterion no wind speed change induced dimensional research; central exhaust tunnel fire smoke diffusion characteristics, analysis of upstream tunnel fire, downstream of the temperature, concentration and vertical attenuation attenuation, finishing 3 at the temperature of the outlet position, the level of concentration and amplitude attenuation the vertical attenuation and the relationship between them, and obtained corresponding dimensionless parameters with upper air velocity, the dimensionless correlations of no dimension. The wind speed changes induced by
Finally, the direction of further work is briefly discussed.

【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U458

【参考文献】