ISO房间火灾烟气层温度数值模拟工程方法研究

Study on engineering method to predict smoke layer temperature in ISO room

利用场模拟FDS和区域模拟CFAST软件,对ISO房间中55kW和110kW的火灾烟气层温度进行数值模拟,将不同尺寸网格划分条件和区域划分方法的计算结果与试验结果进行分析比较,在保证一定精度条件下,为减少计算所需时间而增大网格尺寸的可能性,并对区域模拟中采用多区域划分方法以提高计算精度的可行性进行了分析,为类似环境的工程应用,单区域划分和多区域划分方法的使用提出了建议。

55 kW, 110 kW fire tests in a ISO room were simulated in field model （FDS） and zone model CFAST. FDS model with grids of 100 mm, 150 mm, 300 mm were used to make temperature predictions, too, CFAST model with one zone and one big zone divided into several small zones were used to make temperature predictions. All simulate results were compared against the results of tests. The comparisons showed that increasing the dimension of grids to reduce computational running time is feasible. The advice also being suggested on the using of two method zoon simulation.