隧道侧向排烟系统小尺寸模型试验研究  

Small-scale model experimental study on tunnel lateral smokeextraction system

作　　者：王骏横 陈聪[3] 温裕春 袁建平 方正[2] WANG Junheng;CHEN Cong;WEN Yuchun;YUAN Jianping;FANG Zheng(School of Environmental Engineering,Wuhan Textile University,Wuhan 430200,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China;Wuhan Metro Group Co.,Ltd.,Wuhan 430030,China)

机构地区：[1]武汉纺织大学环境学院,湖北武汉430200 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]武汉地铁集团有限公司,湖北武汉430030

出　　处：《武汉大学学报（工学版）》2021年第6期509-514,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51576144);湖北省自然科学基金项目(编号:2020CFB402);武汉地铁集团有限公司科研项目(编号:GS-JZ-229)。

摘　　要：为了探究侧向排烟系统对隧道火灾烟气的控制效果及其对烟气蔓延状态的影响,进行了小尺寸(相似比为1/14)的模型试验研究。试验中获得了不同排烟风速作用下,模型隧道中温度场以及隧道出入口处的风速变化情况,对诱导风速和回流烟气长度进行了无量纲分析,并计算了隧道中的烟气层高度。结果表明侧向排烟系统工作时产生的诱导风速对车行隧道火灾烟气的蔓延有明显的抑制作用,并提出了最优诱导风速所对应的无量纲回流烟气长度;另外,通过对温度场的数据分析发现,侧向排烟系统有助于保持烟气层的稳定,能够使其界面层维持在较高位置。In order to explore the control effect of lateral smoke exhaust system on tunnel fire smoke and its influence on smoke spread state,experiments on the lateral extraction system are conducted in the small-scale(similarity ratio is 1/14)model tunnels.Temperature field and wind velocity at the entrance with different exhaust velocity are measured in the experiments.Based on the data,dimensionless induced longitudinal velocity,dimensionless backflow length and smoke layer height are obtained.The results show that the longitudinal velocity induced by the lateral extraction system has a significant inhibitory effect on the spread of fire smoke in the vehicle tunnel,and the dimensionless return smoke length corresponding to the optimal induced wind speed is proposed.In addition,through the data analysis of the temperature field,it is found that the lateral smoke exhaust system helps to maintain the stability of the smoke layer,and can keep the interface layer at a higher position.

关 键 词：侧向排烟系统 隧道火灾 小尺寸模型试验 诱导风速 烟气层界面高度 

分 类 号：U453[建筑科学—桥梁与隧道工程]