摘要
结合不同的烟气羽流模型与门口溢流模型,对室内火灾过程进行建模,利用区域模拟方法计算室内热烟气层厚度及温度随时间的变化情况.利用ISO 9705全尺寸标准火灾实验系统进行实验研究,通过计算结果与实验结果的比较,分析不同羽流模型的适用性.结果表明:Thomas模型与McCaffrey模型预测的羽流流量值偏大,导致烟气温度计算值比实验值偏低,不适用于大功率火源的情况;Zukoski模型预测的羽流卷吸量偏低,其温度计算值比实验值偏高,适合于小功率火源的情况;Heskestad模型预测的羽流流量值较为稳定,区域模拟结果与实验符合得较好,可用于大功率火灾羽流的预测.
With different plume and spill plume correlations, a simple model was built to describe compartment fires. The zone method was used to calculate the temperature and thickness of hot smoke in compartment fires. The corresponding experiments were performed with the ISO 9705 full-scale standard fire experimental system. The applicability of the different plume models was analyzed on the basis of the comparison between the calculated results and the experimental data. The results demonstrated that the Thomas model and McCaffrey model predicted a greater plume flow, which caused a lower calcu-lated smoke temperature, so they are inapplicable to large power fires. The plume flow predicted by the Zukoski model was smaller, and the calculated temperature was higher than the measured one, so it is more applicable to small power fires. The plume flow predicted by the Heskestad model was steady, and the result of the zone simulation agreed well with the experimental data, so it could be used to predict large power fires.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第4期295-299,共5页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(50706059)
河南省煤矿瓦斯与火灾防治重点实验室开放基金资助项目(HKLGF200503)
国家自然科学基金重大国际合作资助项目(50320120156)
