通风因子和火源功率协同作用下腔室火灾演化  

Fire evolution mechanism of chamber under synergistic effect of ventilation factor and fire power

作　　者：赵玉霞 冯伟 ZHAO Yuxia;FENG Wei(Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China;不详)

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]西部绿色建筑国家重点实验室,陕西西安710055 [3]秀山县住房城乡建设委员会,重庆409900

出　　处：《工业安全与环保》2024年第6期22-27,共6页Industrial Safety and Environmental Protection

摘　　要：针对腔室火灾演化特点,开展了腔室火灾演化过程研究,分析了不同火源功率和通风因子协同作用对热释放速率曲线的影响规律,探明了腔室温升、轰燃/弱轰燃等火灾演化规律和机理。结果表明:腔室火灾分燃料和通风控制两类,前者为单一火灾发展,常发生轰燃,室内温升600~800℃,受通风因子和火源功率协同作用影响明显,体现在热释放速率和腔室温升的改变,火源功率和通风因子越大,协同作用对火灾演化的影响程度越大,但通风因子主要影响室内火灾,而火源功率则倾向于外立面火灾。后者经历多阶段变化,会在短时间内发生弱轰燃,形成500℃左右高温环境,主要受火源功率影响,但通风因子若表现出降温作用,也受火源功率和通风因子的协同作用。According to the characteristics of chamber fire evolution,we carried out research on the fire evolution process in chambers.We analyzed the influence law of different fire power and ventilation factors on the heat release rate curve.We also explored fire evolution laws and mechanisms such as chamber temperature rise and flashover/weak flashover.The results show that chamber fires are divided into fuel-controlled and ventilation-controlled types.The former is a single fire development,often leading to flashover and indoor temperature rises of up to 600-800℃.This is clearly affected by the synergy between ventilation factors and fire source power,which is reflected in changes in heat release rate and chamber temperature rise.The larger the fire source power and ventilation factor,the greater their synergy effect on fire evolution.The ventilation factor mainly affects indoor fires,while the power of the fire source tends to affect facade fires.The latter undergoes multi-stage changes,leading to weak flashover in a short time,crea-ting a high-temperature environment of around 500℃.This is mainly influenced by the power of the fire source.How-ever,if the ventilation factor has a cooling effect,it is also influenced by the synergy between the power of the fire source and the ventilation factor.

关 键 词：腔室火灾 通风因子 火源功率 轰燃 弱轰燃 

分 类 号：TD7[矿业工程—矿井通风与安全]