环境风下三面围护结构内池火火焰形态参数预测

A Prediction Model of Pool Fire Flame Morphological Characteristics in Three Sidewalls Enclosure Structure Under Ambient Wind

本文通过开展环境风下三面围护受限结构内油池火燃烧实验,研究火焰形态随风速的变化规律。实验结果表明该受限结构内油池火的最大火焰高度、火焰迹线长度均随风速呈不变或增大趋势。将实验数据与前人的预测模型进行对比,发现前人的模型不能很好地描述池火火焰形态的变化规律。通过物理模型和无量纲分析,耦合了三面围护结构和环境风对池火火焰形态的作用,提出火焰高度和火焰迹线长度的预测模型。

Series of experiments on the combustion of pool fire within a three sidewalls enclosure structure under ambient wind were conducted to investigate the variation of flame morphology with wind velocity.The results indicate that the maximum flame height and flame trajectory length of pool fires within the confined structure show a constant or increasing trend with wind velocity.Comparing the experimental data with previous predictive models,it is found that the previous models could not accurately describe the variations of flame geometry.Through physical model and dimensionless analysis,the coupling effect of sidewalls and ambient wind on flame geometry of pool fires was investigated and the prediction models of flame height and flame trajectory were proposed in this paper.