This paper examines experimentally the burning behaviors of transformer oil pool fires. A series of transformer oil pool fire tests with different pool diameters (0.2–1 m) were conducted. The mass burning rate, flame height, liquid layer temperature, flame temperature, and radiative heat flux were measured and analyzed. A new correlation for the mass burning rate as a function of pool diameter is deduced. The experimental flame height is compared to existing correlations, and it is found that the present result is in better agreement with those deduced for heavy oils. The liquid temperature results show that the fuel layer consists of a boiling layer and a gradient layer, and the thickness of the boiling layer is found to be around 2.6 mm independent of the pool diameter. The flame temperature is also analyzed and three zones are observed, for which a piecewise function is deduced. The radiation fraction and the emissive power of the flame are determined, respectively, based on the source flame model and solid flame model, and an exponential decay of the radiation fraction as a function of pool diameter is obtained. The present results are important for estimation of thermal radiation from a pool fire on the surrounding objects in practical transformer oil fires.

中文翻译：

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变压器油池大火燃烧特性的实验研究

本文通过实验检验了变压器油池火的燃烧行为。进行了一系列不同油池直径（0.2-1 m）的变压器油池燃烧测试。测量并分析了质量燃烧速率，火焰高度，液层温度，火焰温度和辐射热通量。推导了质量燃烧速率与池直径的函数的新的相关性。将实验火焰高度与现有的相关性进行了比较，发现目前的结果与针对重油得出的结果更好地吻合。液体温度结果表明，燃料层由沸腾层和梯度层组成，并且沸腾层的厚度约为2.6 mm，与池直径无关。还分析了火焰温度并观察到三个区域，为此推导出分段函数。分别根据源火焰模型和固体火焰模型确定火焰的辐射分数和发射功率，并获得随池直径变化的辐射分数的指数衰减。在实际的变压器油火灾中，当前结果对于估算池火对周围物体的热辐射非常重要。