| 障碍物对隧道火灾中竖井自然排烟效果的影响* |
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| 引用本文： | 钟委,韩宁,孙超鹏.障碍物对隧道火灾中竖井自然排烟效果的影响*[J].中国安全生产科学技术,2021,17(1):48-53. |
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| 作者姓名： | 钟委 韩宁 孙超鹏 |
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| 作者单位： | （郑州大学 力学与安全工程学院，河南 郑州 450001） |
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| 基金项目： | 国家留学基金委项目(201807045042);国家自然科学基金青年科学基金项目(51706219);河南省省科技攻关重点项目(182102310007)。 |
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| 摘 要： | 为研究障碍物对隧道火灾中竖井自然排烟效果的影响，利用数值模拟方法分析不同的纵向风速和隧道内障碍物所处的不同位置对隧道及竖井内温度场、流场结构的影响，并根据模拟结果计算竖井排出热量。结果表明:随着火源与障碍物纵向距离的改变，在近火源区域，竖井后方会发生吸穿现象；在中间区域，障碍物后方发生边界层分离，烟气层变厚；在近竖井区域，竖井和负压区的耦合作用使烟气层变薄；排出热量随着纵向风速的增大先增加后减少，临界风速为1.5 m/s。
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| 关 键 词： | 隧道火灾 数值模拟 竖井排烟 障碍物 FDS |
Influence of obstacles on natural smoke exhaust effect of shaft in tunnel fire |
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| ZHONG Wei,HAN Ning,SUN Chaopeng.Influence of obstacles on natural smoke exhaust effect of shaft in tunnel fire[J].Journal of Safety Science and Technology,2021,17(1):48-53. |
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| Authors: | ZHONG Wei HAN Ning SUN Chaopeng |
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| Affiliation: | (School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou Henan 450001,China) |
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| Abstract: | In order to study the influence of obstacles on the natural smoke exhaust effect of shaft in the tunnel fire,the numerical simulation method was used to analyze the influence of the location of obstacles in the tunnel on the temperature field and flow field structure in the tunnel and shaft under different longitudinal wind speeds,and the exhaust heat of shaft was calculated according to the simulation results.The results showed that with the change of the longitudinal distance between the fire source and the obstacle,in the area near the fire source,the phenomenon of plug-holing would occur behind the shaft.In the middle area,the boundary layer behind the obstacle separated,and the smoke layer became thicker.In the area near the shaft,the coupling effect of the shaft and negative pressure zone made the smoke layer thinner.The exhaust heat increased first and then decreased with the increase of longitudinal wind speed,and the critical wind speed was 1.5 m/s. |
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| Keywords: | tunnel fire numerical simulation smoke exhaust by shaft obstacle FDS |
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