摘要
地下环形受限空间是一种新型地下公共交通系统,开展其火羽流运动规律研究必要且迫切。不同火源位置会产生长通道、墙角、丁字、十字等不同边壁效应,火羽流卷吸特性截然不同。以某典型地下环形受限空间为研究对象,采用数值模拟方法及理论分析方法,分析了火源位于主干隧道、出入口支路隧道、交叉路口隧道、下沉庭院4个火灾场景下的羽流分层形态及演化过程。结果表明:不同火源位置下火羽流卷吸特性截然不同,火源位于主干隧道时火灾危险性最大,羽流速度、浓度、温度等均最高;下沉庭院、出入口支路隧道因其空间开阔排烟方便,火灾危险性相对较低,但在下风向产生了明显烟气集聚效应。
This paper is focused on the study of different boundary effects,such as due to the long tunnels,corner-shaped,Tshaped and cross-shaped tunnels caused or created by the different fire source locations in the underground annular confined space.Thus,the paper is focused on the discussion of the influence of the boundary effects on the movement regularity of the plume and the fire hazard under different fire source locations.In the given paper,we would like to take a typical underground annular confined space as the research goal through a numerical simulation and theoretical analysis.To achieve the study goal,the first step necessary to take is to find and determine the fire power source to be 10 MW on the basis of the previous studies.And,the next step is to establish a geometric model and physical model of the underground annular confined space.The third step is to set up a multiple fire scene in different fire source locations of the said underground confined space so as to study and analyze the plume stratification morphology and evolution process finally under the four fire scenes of the key tunnel,with its exit and entrance branch tunnel,intersection tunnel and sunken courtyard.The results of such a comprehensive study can help to reveal the particular features of the plume entrapment in different fire source locations in the said confined space.The fire hazard would be greatest in case the fire source is located in the main tunnel with the fire plume velocity,its concentration and the fire temperature being greatest.On the other hand,if the fire source is coming from the sunken courtyard and the tunnel of the entrance and exit branches,the smoke emission effect should be very aggressive.On the contrary,the fire risk would be rather low due to the open space of the sunken yard with its tunnel entrance and exit branches.The results of given study are expected to enrich the existing theories of fire dynamics in the confined space and provide more theoretical reference for smoke control and safe workers'evacuation from the underground confined space.
作者
朱杰
张子洋
程友鹏
ZHU Jie;ZHANG Zi-yang;CHENG You-peng(Institution of Technology,Sichuan University Key Laboratory of Public Fire Prevention and Control Technology,Sichuan Normal University,Chengdu 610101,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2019年第4期1166-1174,共9页
Journal of Safety and Environment
基金
国家自然科学基金项目(51506135,51446002)
四川省教育厅重点项目(16ZA0055)
四川省科技厅应用基础研究项目(2019YJ0527)
关键词
安全工程
地下环形受限空间
不同火源位置
火羽流
运动规律
边壁效应
safety engineering
underground ring confined space
different fire location
fire plume
motion law
wall effect
作者简介
朱杰,教授,博士,从事受限空间火灾动力学特性及理论研究,zhujie0805@163.com。
