综合管廊电缆桥架火灾的温度场分布特性  

Temperature field distribution of cable tray fire in utility tunnel

作　　者：黄萍[1] 秦亮 余龙星 陈珊娜 林煜垚 黄璐妍 HUANG Ping;QIN Liang;YU Longxing;CHEN Shanna;LIN Yuyao;HUANG Luyan(College of Environment and Resources,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学环境与资源学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2021年第4期544-550,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学青年基金资助项目(52006210)。

摘　　要：针对综合管廊电缆火灾的危害性,建立截面尺寸为1∶1的管廊模型,重点研究电缆火灾造成的受限空间温度场分布.结果表明:烟气的沉降作用可将垂直温度场划分为顶棚射流层、中间热烟气过渡层和底部冷空气层;封堵端口会加快顶棚烟气温度的纵向衰减速度,并分别提出封堵侧和贯通侧的顶棚温度纵向衰减预测模型;对于火源功率较小的电缆桥架火灾,火源功率与顶棚最大温升满足线性关系.通过建立顶棚最大温升预测模型,发现实验值与预测值之间的误差均能维持在37%以内,其中最小的预测误差为14.73%,模型的整体预测效果较好.In order to investigate the hazards of cable tray fire in utility tunnel,a utility tunnel model with a section size of 1∶1 was established.The temperature field distribution in the confined space induced by cable tray fire was studied.The results showed that the vertical temperature field caused by smoke stratification can be divided into three layers,namely the ceiling jet layer,intermediate hot smoke transition layer and the bottom layer of cold air,respectively.Sealing the portal would accelerate the decay rate of longitudinal smoke temperature distribution.Thus,the prediction models of the longitudinal smoke temperature distribution for the sealing portal and the opening portal were proposed,respectively.For the cable tray fire with small fire power,the relationship between the power of the fire source and the maximum excess ceiling temperature was found to be linear.A prediction model of the maximum excess ceiling temperature was proposed.It is shown that the error between the experimental value and the predicted value can be maintained within 37%,while the minimum prediction error was 14.73%.In general,the prediction accuracy is fairly well.

关 键 词：综合管廊 电缆桥架火灾 温度场分布 顶棚最大温升 

分 类 号：X913.4[环境科学与工程—安全科学]