改进点源法在火灾热辐射计算中的应用

Application of improved point source model in fire radiation calculation

为了对火灾热辐射进行较为准确的计算,借鉴CFD计算理论,对热辐射点源模型进行改进,根据火焰宽度、燃烧速率相同的原则,对火焰进行'离散',对控制点的数量进行分析,并试验验证改进点源模型的精确性。结果表明:改进点源模型实现了火灾热辐射的快速计算且精度较高,当火焰高度上点源个数为71时,点源个数的增加对计算结果的改善不明显;计算结果比试验结果数值偏高。

In order to accurately calculate the fire radiation,the point source model was improved based on CFD theory.Fully considering the flame width and uniform burn rate,the fire was scattered.The influence of control points number was analyzed,and the accuracy of improved point source model was verified through the experiment.The results show that the improved point source model can achieve rapid fire radiation calculation and the precision is high.When the number of point sources on the flame height is 71,the increase in the number of point sources has little effect on the calculation results.The calculated results is higher than the experimental results.