摘要
为探究分岔隧道烟气流动特性,采用CFD数值仿真技术,选取3个火源位置、5个热释放速率,模拟分析顶棚最大温升、主隧道及岔道内顶棚下方温度纵向衰减规律。结果表明:火源位置对顶棚下火源正上方最大温度影响较小,最大温差约为34℃,但对火源附近温度影响较大,其中距火源0.5 m处最大温差约为110℃;通过对比Hu等和Gong等的预测模型在岔道内顶棚下温度纵向衰减上的拟合曲线可知,Gong等的模型准确性更高;主隧道内上、下游顶棚下温度纵向衰减呈现出不同程度的“反超现象”,且随火源位置逐渐移向岔道内时,“反超现象”逐渐滞后。
In order to explore the flow characteristics of fire smoke in the bifurcated tunnel,the CFD numerical simulation technology was used to simulate and analyze the maximum temperature rise of ceiling and the longitudinal temperature attenuation under the ceiling in the main and branch tunnels with selecting three fire source locations and five heat release rates.The results showed that the fire source location had little effect on the maximum temperature under the ceiling above the fire source,with the maximum temperature difference of about 34℃,while it had greater influence on the temperature near the fire source,and the maximum temperature difference at the location of 0.5 m away from the fire source was about 110℃.By comparing the fitting curves of longitudinal temperature attenuation under the ceiling in the branch tunnel by the Hu and Gong’s prediction models,it was found that the Gong’s model was more accurate.The longitudinal temperature attenuation under the ceiling in the upstream and downstream of main tunnel presented different degrees of“overpass phenomenon”,and when the fire source location gradually moved to the branch tunnel,the“overpass phenomenon”gradually lagged behind.
作者
李智胜
蒋浩锴
高云骥
靳开颜
张玉春
李涛
LI Zhisheng;JIANG Haokai;GAO Yunji;JIN Kaiyan;ZHANG Yuchun;LI Tao(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2021年第5期118-122,共5页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(51578464)
四川省科技厅项目(2020YFH0045)
中央高校基本科研业务项目(2682019CX17)。
关键词
分岔隧道
烟气
CFD
火源位置
纵向衰减
bifurcated tunnel
smoke
CFD
fire source location
longitudinal attenuation
