火蔓延及发展过程的计算机模拟

本文对火蔓延及发展过程进行了计算机模拟,建立了描述火焰在不结焦可燃物垂直表面向上蔓延过程的数学物理模型,其中考虑了有关的四个分过程,即(1)可燃物未燃部分的预热;(2)火蔓延或热解区前沿的确定;(3)可燃物的热解以及(4)挥发份燃烧放热。在分别建立描述这些分过程模型的基础上,构成了体现几何尺寸和其它有关因素影响的总括模型,其结果与PMMA竖板上的实验结果进行了对比。

Fire spread and growth a computer simulation

A computer simulation for fire spread and growth has been developed.The simulation is based on the four components of fire,(1)preheating of the unburned fuel.(2)fire spread or the determination of the location of the pyrolysis front.(3)pyrolysis of the material and (4)the heat fluxes resulting from the combustion of pyrolysing gases.These components are modeled independantly and combined into a general model so that geometry and other contributing factors come in as parameters to different cases of simulation.The models inplemented so far are for a noncharring material placed vertically generating fire growth in an upward direction.The results of the numerical model and its simulation are compared with experiments run with PMMA vertical slabs.