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。
With the development of urban construction, tunnels with vertical shafts have been increasingly used in urban traffic tunnels. In this paper, steady and unsteady methods are used to simulate the airflow field of vertical-shaft type tunnels under fire conditions. The effect of vertical shaft natural ventilation opening on high temperature gas diffusion is analyzed. It is found that natural ventilation of vertical shafts introduces cold air outside the tunnel, significantly lowering the fire source temperature, to some degree reducing the damage of high temperature smoke and gases to the tunnel roof at the fire source. The introduction of fresh air also significantly lowers the concentration of toxic gases near the fire source, improving the rescue condition. The centralized discharge of toxic smoke and gases at the opening of tunnel terminal is changed to decentralized discharge at the natural ventilation opening of vertical shafts, which provides important guide for fire rescue and evacuation planning. The natural ventilation plan could meet the demand of fire escape.
[1] 王雅君. 东西向北横快速通道实质性启动[EB/OL]. [2013-02-23]. http://www.shbiz.com.cn. Wang Yajun. Things start substantive northward cross channel[EB/OL].[2013-02-23]. http://www.shbiz.com.cn.
[2] 茅靳丰, 黄玉良, 朱培根, 等. 火灾工况下城市隧道自然通风模型实验[J]. 解放军理工大学学报: 自然科学版, 2008, 9(4): 357-362. Mao Jinfeng, Huang Yuliang, Zhu Peigen, et al. Experiment of city tunnel model with natural ventilation in case of fire[J]. Journal of PLA University: Science and Technology Edition, 2008, 9(4): 357-362.
[3] 王彦富, 龚延风, 蒋军成, 等. 半敞开式隧道火灾试验[J]. 解放军理工大学学报: 自然科学版, 2008, 9(3): 248-254. Wang Yanfu, Gong Yanfeng, Jiang Juncheng, et al. Fire test of tunnel with openings on roof[J]. Journal of PLA University of Science and Technology: Science and Technology Edition, 2008, 9(3): 248-254.
[4] 李婷婷, 唐娴. 长大隧道内火灾烟雾运动和温度分布数值模拟[J]. 武汉理工大学学报, 2010, 32(12): 66-69. Li Tingting, Tang Xian. Numerical simulation of smoke movement and temperature distribution in a tunnel fire[J]. Journal of Wuhan University of Technology, 2010, 32(12): 66-69.
[5] 涂江峰, 朱培根, 田义龙, 等. 竖井型城市隧道火灾烟气流动模拟分析[J]. 洁净与空调技术, 2012(3): 1-3, 13. Tu Jiangfeng, Zhu Peigen, Tian Yilong, et al. Simulation and analysis of the fire smoke in city tunnel with vertical well[J]. Clean and Air Conditioning Technology, 2012(3): 1-3, 13.
[6] 李小江. 城市隧道纵向射流通风技术的应用研究[D]. 天津: 天津大学, 2008. Li Xiaojiang. Application research of city tunnel longitudinal jet ventilation technology[D]. Tianjin: Tianjin University, 2008.
[7] Schetz J A. 高速列车空气动力学[J]. 力学进展, 2003, 33(3): 404-423. Schetz J A. Aerodynamic characteristics of high-speed trains[J]. Advances in Mechanics, 2003, 33(3): 404-423.
[8] 施孝增. 气溶胶颗粒物在典型送风方式下的扩散特性与分布规律研究[D]. 上海: 同济大学, 2010. Shi Xiaozeng. Diffusion and distribution of aerosol particles in typical air supply mode[D]. Shanghai: Tongji University, 2010.
[9] 冯炼, 王泽宇. 带竖井长大公路隧道火灾通风的CFD分析[J]. 公路, 2007(4): 193-196. Feng Lian, Wang Zeyu. CFD analysis of fire ventilation in long highway tunnel with shaft[J]. Highway, 2007(4): 193-196.
[10] Hermann S. Boundary layer theory[M]. New York: New York McGraw-Hill Book Company, 1968.
[11] 张林. 公路隧道射流通风数值模拟与风机安装参数优化[D]. 重庆: 重庆交通大学, 2009. Zhang Lin. Parameter optimization of highway tunnel jet fan installation numerical simulation and wind machine[J]. Chongqing: Chongqing Jiaotong University, 2009.
