高层建筑火灾时烟气温度扩散的数值模拟

分析了高层建筑火灾期间疏散通道内烟气温度场分布的变化规律.通过建立热平衡差分方程,分析烟气与建筑物墙体的传热过程;建立烟气与空气混合的数学模型,分析烟气在高层建筑横向通道内的扩散过程.通过算例分析了烟气温度与扩散时间和疏散通道长度的变化规律,在烟气扩散过程中烟气温度变化受火源烟气发生量的影响较大,而受建筑墙体与烟气热交换的影响较小.

Computational simulation of smoke temperature diffusing in high-rise building fire

The variation rules of smoke temperature field distributed in passages of high-rise building are the foundation of fire fighting. Heat-transfer process between smoke and building walls was analyzed by using of difference equation of heat balance, and diffusion process between smoke and transverse passage of high-rise building was analyzed by mathematical model of air mixed with smoke. The variation rules of smoke temperature, diffusion time and length of exit passageway were analyzed by cases. The conclusion is fire head smoke temperature variation in smoke diffusion process more affected by generation quantity of smoke and less affected by heat-transfer process between smoke and building walls.