摘要
地下环形受限空间作为一种新型的地下公共交通系统,火灾已成为其安全使用的最大威胁。火羽流卷吸运动机理研究是进行火灾风险评估、防排烟设计的重要基础。采用数值模拟、理论分析方法,研究了不同通风方式、火源位置共同耦合作用下地下环形受限空间火羽流卷吸特性的机理;定量分析了9个火灾场景,即主干隧道、出入口支路隧道、交叉路口隧道三种火源位置在横向、半横向、纵向不同通风方式下的火羽流在受限空间顶棚的温度、烟羽流高度和火羽流CO浓度的变化规律;最终提出了当火源位置位于主干隧道时,半横向通风方式最佳,火源位于出入口支路隧道时,横向通风方式最佳,火源位于交叉路口隧道时,纵向通风方式最佳;为提升地下环形受限空间整体的消防安全性能,其排烟方式应采取多种排烟方式的组合。本研究可补充现有受限空间火灾动力学理论,为地下受限空间火灾烟气控制、人员疏散以及火灾综合防治提供理论依据。
Confined underground ring space is a new underground public transport system. Fire has become the most threatening to its safe use.Research on the mechanism of fire flume entrainment is the basis of fire risk assessment and smoke control design.This paper takes numerical simulation and theoretical analysis methods to study the mechanism of fire plume entrainment characteristics in the confined underground ring space under the coupling effects of different ventilation modes and different fire sources.Then the paper quantitatively analyzes the fire plume ceiling temperature,the smoke plume height and the fire plume CO concentration in nine fire scenes with th setting of three fire sources as the main tunnel,the entrance and exit branch tunnel and the intersection tunnel, as well as the setting of three ventilation conditions as lateral,semi-transverse and longitudinal;Finally,the paper concludes that when the fire source is located in the main tunnel,the semi-lateral ventilation is the best way;when the fire source is located at the entrance and exit branch tunnel,the horizontal ventilation is the best way;when the fire source is located at the intersection tunnel,the longitudinal ventilation is the best way.The research can contribute to the theory of confined space fire dynamics,thereby providing theoretical basis for smoke control,evacuation and fire suppression of confined underground space.
作者
朱杰
马金梅
彭莉
ZHU Jie;MA Jinmei;PENG Li(Institution of Technology,Sichuan Normal University,Chengdu 610101,China;Sichuan Provincial Key Laboratory of Public Fire Prevention Technology,Chengdu 610101,China)
出处
《安全与环境工程》
CAS
北大核心
2019年第2期145-155,共11页
Safety and Environmental Engineering
基金
国家自然科学基金项目(51446002)
关键词
地下环形受限空间
火羽流
卷吸特性
通风方式
边壁效应
confined underground ring space
fire plume
entrainment characteristic
ventilation mode
wall effect
