火源横向位置对隧道火灾烟气分岔流动影响

发布时间：2018-05-22 09:45

本文选题：隧道火灾 + 数值模拟　；参考：《郑州大学学报(工学版)》2017年01期

【摘要】：当发生隧道火灾时,纵向通风方式常被用于人员疏散和排烟,而纵向风速较大时,烟气将发生分岔流动,导致烟气层整体性被破坏,对人员疏散造成威胁.火源横向位置对隧道火灾烟气流动有显著影响,通过数值模拟对不同火源横向位置时烟气分岔流动特性进行了研究.结果表明,随着火源向侧壁靠近,烟气由对称型分岔流动转变为不对称分岔流动.当火灾发生在侧壁附近时,烟气转变为"S"型流动.随着火源与侧壁间距的减小,分岔流动临界风速呈指数型增加.
[Abstract]:When tunnel fire occurs, longitudinal ventilation is often used to evacuate people and exhaust smoke. When the longitudinal wind speed is high, the flue gas will be bifurcation and flow, which will lead to the destruction of the integrity of the flue gas layer and threaten the evacuation of people. The lateral position of fire source has a significant effect on the smoke flow in tunnel fire. Numerical simulation is used to study the characteristics of flue gas bifurcation under different transverse positions of fire source. The results show that the flow of flue gas changes from symmetric bifurcation to asymmetric bifurcation as the fire source approaches the lateral wall. When the fire occurred near the side wall, the smoke changed into "S" type flow. With the decrease of the distance between the fire source and the side wall, the critical velocity of bifurcation flow increases exponentially.
【作者单位】：郑州大学力学与工程科学学院;建筑安全与环境国家重点实验室;
【基金】：国家自然科学基金资助项目(51404215) 国家博士后基金特别资助项目(2015T80781) 建筑安全与环境国家重点实验室开放课题(BSBE2015-02)
【分类号】：U458

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