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。采用计算流体力学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。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。
With the development of urban construction, Vertical-well tunnel increasingly used in urban traffic tunnel. In this paper, computational fluid dynamics method is used to simulate flow field of vertical-type tunnel in the fire condition. The effect of natural ventilation vertical well to high temperature gas diffusion is analyzed. Believes that natural ventilation vertical well introduce cold air outside the tunnel, significantly lower ends of the fire source temperature, high temperature flue gas can be reduced at the source of fire damage to the roof of the tunnel to a certain extent. Through the introduction of new air, the concentration of toxic gases near the fire source is significantly reduced; the rescuing condition is also improved. The emission of fire toxic fumes is changed from centralizing to dispersing, which have an important role for guiding fire rescue and evacuation programs. The program of natural ventilation vertical well is feasible for personnel escaping under fire conditions.
出处
《洁净与空调技术》
2014年第4期1-5,共5页
Contamination Control & Air-Conditioning Technology
基金
中心城区地下快速路空气净化标准研究(12231201001)
