The usage of liquid fuel is commonly subjected to a spilling fire due to the accidental leakage. The flame radiation is the primary heat transfer mode in supporting the advancement of large-scale spilling fire. In this work, spilling fires are carried out based on a 6 m × 0.8 m × 0.1 m tray, and the spilling fire performance and flame radiation are examined. The instantaneous flame height and mass burning rate versus fire spread distance are examined. The radiation heat flux of large-scale spilling fire to subsurface flow area is obtained by dividing the flame configuration into a triangular-prism flame and a cuboid flame. The multi-cuboid flame equivalent-division method is proposed to estimate the radiation heat flux of leading triangular-prism flame, finding that the maximal 70 equivalent divisions are sufficiently accurate. The proportion of triangular-prism flame radiation to total heat flux reduces from 100 % to 50 % during spilling fire propagation. The triangular-prism flame radiation plays a dominant role in heat transfer to the subsurface flow area while the cuboid flame radiation plays a secondary role. The current research is of great significance for revealing heat transfer mechanism and predicting rate of spilling fire.

中文翻译：

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新提出的大范围溢火向地下对流区域的三角棱柱火焰辐射模型


液体燃料的使用通常会因意外泄漏而发生溢出火灾。火焰辐射是支持大规模溢出火灾进展的主要传热方式。本工作基于6m×0.8m×0.1m托盘进行溢出火灾，考察溢出火灾性能和火焰辐射。检查瞬时火焰高度和质量燃烧速率与火蔓延距离的关系。将火焰形态分为三棱柱火焰和长方体火焰，得到大面积溢出火焰向地下流动区域的辐射热通量。提出了多长方体火焰等效划分方法来估计前三角柱火焰的辐射热通量，发现最多70个等效划分就足够准确。溢出火蔓延过程中，三棱柱火焰辐射占总热通量的比例从100%降低到50%。三棱柱火焰辐射在地下流动区域的传热中起主导作用，而长方体火焰辐射起次要作用。目前的研究对于揭示传热机理和预测溢火速率具有重要意义。