固体可燃物热解与空间火蔓延相互作用的大涡模拟  

Large eddy simulations of the interaction between combustible solid pyrolysis and space fire spread

作　　者：袁书生[1] 张健[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第5期892-895,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2001CB409600)

摘　　要：为了能较为真实地描述火灾过程,采用固体可燃物热解动力学模型与大涡模拟方法,对多室内聚氨酯泡沫(PUF)板热解与空间火蔓延的相互作用进行了数值模拟。计算出了PUF板在外部热流作用下的瞬时质量变化速率,结果与实验相符合,计算得到的着火房间内烟气温度随时间的变化也与实验结果相符合。受空间火蔓延的影响,PUF板上表面的热流密度分布是不均匀的。PUF板的热解和形状改变先是从热流密度较高的板中心处开始,逐渐向周围扩展和蔓延,其热解和消耗也不是对称的。A combustible solid pyrolysis kinetics model and large eddy simulations were used to simulate the interactions between polyurethane foam （PUF） slab pyrolysis and space fire spreading in a multi-room building to more accurately describe the fire process. The predicted instantaneous mass variation rates of the PUF slab due to external heat fluxes and the variations of the smoke temperature with time in the burning room agree well with measurements. As the fire spreads, the heat fluxes on the PUF upper slab surfaces are non-uniformly distributed. The PUF slab pyrolysis and the change in its configuration start in the slab center with a relatively high heat flux and then gradually extend outwards with the PUF slab consumed in an asymmetric manner.

关 键 词：多室火灾 固体可燃物 热解动力学 大涡模拟 

分 类 号：TU998.1[建筑科学—市政工程]