半横向通风下顶棚有效高度对隧道烟气温度的影响  

Effect of effective ceiling height on tunnel smoke temperature under semi horizontal ventilation

作　　者：郑家辉 郑雨航 葛樊亮 杨健[1] ZHENG Jiahui;ZHENG Yuhang;GE Fanliang;YANG Jian(College of Environment and Safety Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学环境与安全工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2024年第5期612-618,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金面上资助项目(52173070)。

摘　　要：为研究半横向通风下隧道内发生火灾时,顶棚有效高度对顶棚烟气温度分布的影响,建立1∶10的缩尺寸隧道模型进行试验.在半横向通风方式下,通过改变通风风速、油池尺寸和顶棚有效高度等参数,分析燃料顶棚烟气最高温升的变化规律和顶棚烟气温度的纵向分布特征.结果表明,随着顶棚有效高度的增加,顶棚最高温升逐渐降低,而且隧道顶棚烟气温度纵向衰减更加显著;同时,风速的增加导致顶棚最高温升大幅下降,相较于纵向通风,半横向通风下顶棚最高温升明显偏小,顶棚烟气温度纵向衰减更明显.据此提出新的考虑通风风速、顶棚有效高度和火源功率的无量纲最高顶棚温升和顶棚烟气温度纵向衰减的经验模型.In order to study the effect of ceiling effective height on smoke temperature distribution in tunnel under semi-transverse ventilation,a tunnel model with reduced size of 1∶10 was established for experimental study.By changing the ventilation speed,the size of the oil pool and the effective height of the ceiling,the variation law of the maximum temperature of the flue gas in the fuel ceiling and the longitudinal distribution characteristics of the flue gas temperature were studied.The results show that with the increase of the effective ceiling height,the maximum temperature rise of the ceiling decreases gradually,and the longitudinal attenuation of the flue gas temperature of the tunnel ceiling is more significant.Compared with longitudinal ventilation,the maximum ceiling temperature rise under semi-transverse ventilation is obviously smaller,and the longitudinal attenuation of ceiling flue gas temperature is more obvious.A new empirical model of dimensionless maximum ceiling temperature rise and ceiling flue gas temperature longitudinal attenuation considering ventilation wind speed,effectiv e ceiling height and fire source power is proposed.

关 键 词：隧道火灾 半横向通风 顶棚有效高度 烟气温度 

分 类 号：U453.5[建筑科学—桥梁与隧道工程] TU352.5[交通运输工程—道路与铁道工程]