This paper proposes novel modifications to existing solid flame and point source models to better predict the spatial contour of near-field, steady-state radiant heat flux from large circular pool fires (with diameters ranging from 1 m to 20 m) with gasoline and diesel fuel. The proposed models account for partial smoke obscuration of the flames, and the emissive power of the visible flame layer is calculated via a radiative fraction of the fire’s heat release rate as a function of the pool size. The modified discretized solid flame model uses a cylinder + cone shape combination whose surfaces are discretized to enable a flexible summation of total radiative energy emission. The modified point source model places its radiating point at the mid-height of the visible flame layer to capture the location of maximum radiation intensity. Predictions from both proposed models are benchmarked against available data from pool fire experiments, calibrated against computational fluid dynamic simulations, and compared with existing analytical solutions for a range of pool fire diameters at varying standoffs and gauge heights. The results demonstrate that the proposed models can effectively predict the spatial contour and peak value of radiant heat flux on nearby targets (i.e., at distances less than 2.5 times the pool diameter) with low computational effort.

本文提出了对现有固体火焰和点源模型的新颖修改，以更好地预测汽油和柴油引起的大型圆形池火（直径范围为1 m至20 m）的近场稳态辐射热通量的空间轮廓汽油。所提出的模型说明了火焰的部分烟雾遮挡，可见火焰层的发射功率是通过火的放热率的辐射分数作为池大小的函数来计算的。改进的离散化固体火焰模型使用圆柱体+圆锥形的组合，其表面被离散化，以实现总辐射能发射的灵活求和。改进的点源模型将其辐射点放置在可见火焰层的中间高度，以捕获最大辐射强度的位置。两种拟议模型的预测均以泳池火灾实验的可用数据为基准，并根据计算流体动力学模拟进行了校准，并与现有的解析解决方案进行了比较，以解决在不同距离和高度下的一系列泳池火灾直径。结果表明，所提出的模型可以有效地预测附近目标（即，距离小于池直径的2.5倍的距离）上的辐射热通量的空间轮廓和峰值，而计算量较小。