竖井型长大城市隧道火灾通风的数值模拟

发布时间：2018-05-11 01:22

本文选题：竖井自然通风口 + 火灾通风　；参考：《科技导报》2014年25期

【摘要】：随着城市建设发展,竖井型隧道越来越多地应用于城市交通隧道中。采用稳态与非稳态方法对火灾工况下竖井型隧道的气流场进行了数值模拟,分析了竖井型自然通风口对高温烟气扩散的影响。研究认为,竖井自然通风口引入隧道外冷空气,显著降低火源端部温度,可在一定程度上减少高温烟气对火源处隧道顶板的破坏。通过竖井引入新风,显著降低火源附近的有毒气体浓度,改善了火灾救援条件。火灾产生的有毒烟气由隧道洞口集中排放转变为竖井自然通风口分散排放,这对制定火灾救援、人员疏散方案有重要的指导作用。本隧道所设置的竖井自然通风口方案可满足火灾情况下人员逃生要求。
[Abstract]:With the development of urban construction, shaft tunnels are more and more used in urban traffic tunnels. The airflow field of a shaft tunnel under fire conditions is numerically simulated by both steady and unsteady state methods, and the influence of the shaft type natural vent on the high temperature flue gas diffusion is analyzed. It is considered that the natural ventilation inlet of shaft can significantly reduce the temperature at the end of the fire source by introducing cold air out of the tunnel, and the damage of the tunnel roof at the fire source can be reduced to a certain extent by the high temperature flue gas. By introducing fresh air into the shaft, the concentration of toxic gas near the fire source is significantly reduced, and the condition of fire rescue is improved. The toxic flue gas produced by fire is changed from concentrated discharge from tunnel opening to scattered discharge from shaft natural vent, which plays an important role in guiding the formulation of fire rescue and evacuation plan. The natural air vent scheme of the shaft in this tunnel can meet the personnel escape requirements under fire conditions.
【作者单位】：上海市政设计研究总院(集团)有限公司;同济大学机械工程学院;
【基金】：上海市科学技术委员会“科技创新行动计划”社会发展领域项目(12231201001)
【分类号】：U453.5

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