环形油池火燃烧火羽流火焰温度及高度模拟研究

Simulation on temperature and flame height of fire plume of annular pool fire

采用FDS数值模拟方法,对火焰融合和火焰未融合两种状态下的环形油池火燃烧火羽流温度及火焰高度进行研究。结果表明:火羽流中心线最高温升的变化趋势与火焰状态密切相关。引入环径比δ,定义了新的无量纲火焰高度H*。δ相同时,H*随火源热释放速率的增大而增大;火源热释放速率相同且火焰发生融合时,H*随δ的增大呈现上升趋势;火源热释放速率相同且火焰未融合时,H*随δ的增大呈现下降趋势。并在火焰融合和未融合两种状态下提出了火焰高度表征模型。

In this paper,FDS is used to study the temperature and flame height of annular pool fire under flame fusion and nonfusion.The results show that the variation trend of the maximum temperature rise of the plume is closely related to the flame state.Introduced the ratio of internal radius to external radiusδ,and a new dimensionless flame height H*is defined.With the sameδ,H*increases with the increase of heat release rate.When the heat release rate of fire source is the same and the flame is fused,H*shows an upward trend with the increase ofδ,and the greater the heat release rate of fire source is,the more obvious the upward trend is.When the fire heat release rate is the same and the flame is not fused,the H*decreases with the increase ofδ.And the empirical characterization models of flame height were proposed under the flame fusion and non-fusion.