This paper presents an experimental investigation on the flame radiation characteristics of pool fire, including the flame emissivity, diameter and temperature. A series of experiments of heptane pool fires with diameters of 0.1–0.4 m were carried out. The flame height, mass loss rate, temperature distribution, flame emissivity and radiative heat flux were measured. A four regions function was used to correlate the centerline temperature rise above the pool surface with the flame height. The variations of the flame diameter against the flame height were formulated for D>0.2 m and D ≤ 0.2 m respectively. The highest flame emissivity is found at the flame base, which decreases with increasing height. Furthermore, a new model predicting the radiative heat flux based on classical solid flame model is developed taking into account the flame emissivity, diameter and temperature variations along the flame height. The comparisons between the new model and other models show that the new model can better predict the thermal radiation from heptane pool fires.

本文对池火的火焰辐射特性进行了实验研究，包括火焰的发射率，直径和温度。进行了一系列直径为0.1-0.4 m的庚烷池火实验。测量了火焰高度，质量损失率，温度分布，火焰发射率和辐射热通量。使用四个区域函数将池表面上方的中心线温度升高与火焰高度相关联。D > 0.2 m和D时，得出了火焰直径相对于火焰高度的变化 分别≤0.2 m。在火焰底部发现最高的火焰发射率，并随高度的增加而降低。此外，考虑到火焰的发射率，直径和沿火焰高度的温度变化，开发了一种基于经典固体火焰模型的预测辐射热通量的新模型。新模型与其他模型之间的比较表明，新模型可以更好地预测庚烷池火产生的热辐射。