摘要
【目的目的】为探究常规交通工况下浅层城市隧道内的通风特性和污染物扩散规律。【方法方法】以郑州市某组合立交工程隧道段项目为研究对象,截取隧道入口段430m为计算案例,采用数值模拟的方法构建机械通风混合自然通风的三维隧道模型,开展了不同工况下的模拟对比分析。【结果】在常规交通工况下,不考虑自然风的影响,隧道内的活塞风大小顺序为混合通风、机械通风、无通风、自然通风;射流风机的开启,对隧道内的风速提升约44%。在隧道污染物完全扩散的初始段,隧道内污染物浓度大小顺序为无通风、自然通风、机械通风、混合通风。【结论结论】在设计和运营隧道通风系统时,对射流风机的使用和优先选择混合通风,可以提高隧道内的空气质量和安全性。
[Purposes]This paper aims to investigate the ventilation characteristics and pollutant diffu-sion patterns in shallow urban tunnels under normal traffic conditions.[Methods]This study takes a cer-tain combined interchange project tunnel section in Zhengzhou as the research object,and selects a 430 m section at the tunnel entrance as the calculation example.A three-dimensional tunnel model of me-chanical ventilation,mixed ventilation,and natural ventilation was constructed using numerical simula-tion,and comparative analysis was conducted under different working conditions.[Findings]Under nor-mal traffic conditions and without considering the influence of natural wind,the order of piston wind in the tunnel is mixed ventilation,mechanical ventilation,no ventilation,and natural ventilation.The open-ing of the jet fan increases the wind speed in the tunnel by about 44%.In the initial stage of complete dif-fusion of pollutants in the tunnel,the order of pollutant concentration in the tunnel is no ventilation,natu-ral ventilation,mechanical ventilation,and mixed ventilation.[Conclusions]When designing and operat-ing tunnel ventilation systems,the use of jet fans and the priority selection of mixed ventilation can im-prove the air quality and safety in the tunnel.
作者
楚飞
徐海杰
杨泽鸣
邵伟
田方正
张文见
李瑞鑫
CHU Fei;XU Haijie;YANG Zeming;SHAO Wei;TIAN Fangzheng;ZHANG Wenjian;LI Ruixin(China Railway Engineering Consulting Group Zhengzhou Design Institute,Zhengzhou 450000,China;Zhengzhou University,Zhengzhou 450001,China)
出处
《河南科技》
2023年第21期78-81,共4页
Henan Science and Technology
关键词
浅层城市隧道
混合通风
通风特性
污染物扩散
数值模拟
shallow urban tunnel
mixed ventilation
ventilation characteristics
pollutant diffusion
nu-merical simulation
