不同曲率通风条件下城市地下交通环道火灾烟流运动机理研究

发布时间：2018-06-30 06:49

本文选题：城市地下交通环道 + 环道曲率　；参考：《四川师范大学》2016年硕士论文

【摘要】：城市地下交通环道作为目前新兴起的新型地下联络通道,属于狭长受限空间,其主要由主环道、连接环道及环道进出口等组成;环道内空间结构、通风等设施设备及车辆通行量均比一般隧道更为复杂独特,火灾危险性更大。目前,国内外尚无完善系统的城市地下交通环道专业防火设计规范,隧道火灾研究也主要集中在地铁、铁路隧道和山岭公路隧道方面,而在其他形式隧道研究方面如曲线型隧道火灾相关方面研究尤为少见,针对不同曲率通风条件下城市地下联系环道火灾烟流运动机理的研究更是鲜有报道,相关研究较为有限。因此开展曲率及通风条件对城市地下交通环道火灾烟流运动机理相关研究十分必要。本研究主要以某城市地下交通环道作为研究背景,结合实地调研、理论分析及CFD数值模拟软件对不同曲率通风条件下城市地下交通环道进行数值模拟研究分析,主要内容如下:(1)通过现场调研并结合地下交通环道国内外已有相关火灾探究内容,总结其结构特点及与常规隧道异同点,并讨论了其起火成因、火场环境中引发的危害结果等。(2)采用FDS及Pyrosim软件,构建不同曲率通风条件下城市地下交通环道火灾烟流运动物理模型,并结合国内外隧道防火设计相关规范及隧道火灾相关研究确定火源功率及各工况参数,总结火灾模拟工况。(3)根据不同曲率及不同纵向通风风速等16种火灾工况下城市地下交通环道模型的计算,分析研究不同曲率、不同纵向通风风速对城市地下交通环道内烟流蔓延扩散规律及温度、可见度等火灾动力学相关数值的影响,探讨曲率及不同纵向通风风速对城市地下交通环道火灾的影响。(4)对比分析模拟结果,总结不同曲率通风条件下城市地下交通联系环道火灾烟流运动机理,最终提出系列针对性烟控措施及建议。本论文研究结果可为城市地下交通联系环道火灾通风方式的选取及设计提供参考,为其火灾预防及人员疏散预案等的编制提供一定的理论参考价值,为其他相关曲线隧道在火灾领域等方面的研究提供一定借鉴,同时对相关地下环形受限空间火灾及通风方面开展更为深入的研究具有重要科学价值。
[Abstract]:Urban underground traffic ring road, as a new type of underground communication channel, is a narrow restricted space, which is mainly composed of main ring road, connecting ring road, ring road inlet and outlet, etc. Ventilation and other facilities and vehicle traffic volume are more complex than the general tunnel, fire risk is greater. At present, there is no systematic design code for the professional fire prevention of urban underground traffic ring roads at home and abroad. The research on tunnel fire is mainly focused on subway, railway tunnel and mountain road tunnel. But in other forms of tunnel research, such as curve tunnel fire related research is particularly rare, the study of urban underground connection ring road fire smoke movement mechanism under different curvature ventilation conditions is rarely reported, and the related research is relatively limited. Therefore, it is necessary to study the mechanism of smoke flow in urban underground traffic ring road fire by curvature and ventilation conditions. This research mainly takes the urban underground traffic ring road as the research background, combines the field investigation, the theory analysis and the CFD numerical simulation software carries on the numerical simulation analysis to the urban underground traffic ring road under the different curvature ventilation condition. The main contents are as follows: (1) through on-the-spot investigation and related fire investigation of underground traffic ring road at home and abroad, the structural characteristics and similarities and differences with conventional tunnels are summarized, and the causes of fire are discussed. (2) using FDS and Pyrosim software to construct the physical model of smoke flow in urban underground traffic annulus fire under different curvature ventilation conditions. Combined with the relevant codes of tunnel fire prevention design at home and abroad and the relevant research of tunnel fire, the power of fire source and the parameters of each working condition are determined. The fire simulation conditions are summarized. (3) according to the calculation of urban underground traffic ring road model under 16 fire conditions, such as different curvature and different longitudinal ventilation wind speed, the different curvature is analyzed and studied. The influence of different longitudinal ventilation wind speed on the spread and diffusion law of smoke flow in urban underground traffic ring road, temperature, visibility and other related values of fire dynamics, The effects of curvature and different longitudinal ventilation wind speed on the fire of urban underground traffic ring road are discussed. (4) the simulation results are compared and analyzed, and the mechanism of smoke flow in urban underground traffic link ring road fire under different curvature ventilation conditions is summarized. Finally, a series of targeted tobacco control measures and suggestions are put forward. The results of this paper can provide a reference for the selection and design of fire ventilation mode of urban underground transportation link ring road, and provide a certain theoretical reference value for the compilation of fire prevention and evacuation plan. It provides some reference for other related curve tunnels in the field of fire, and also has important scientific value for further research on fire and ventilation in underground confined space.
【学位授予单位】：四川师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U458

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