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Measurements and models to characterise flame radiation from multi-scale kerosene fires
Fire Safety Journal ( IF 3.1 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.firesaf.2020.103179
Giacomo Erez , Anthony Collin , Gilles Parent , Pascal Boulet , Mathieu Suzanne , Aurélien Thiry-Muller

Abstract A detailed understanding of flame radiation is useful in numerous fire applications, and can be improved through experiments and modelling: the work presented here is a contribution to both aspects. Data were gathered for kerosene pool fires (30–250 cm wide), in order to characterise the flame geometry and emission. It was shown that the average visible flame can be well approximated by a conical shape. Radiation of soot in the flame was described with an equivalent absorption coefficient and temperature. The results appear to be only weakly dependent on the fire size, which is a valuable information for upscaling approaches. Experimental data were used to compute heat fluxes received by targets outside the flame with four models, based on different assumptions regarding radiation absorption in the flame. Numerical results were compared to experimental ones in order to assess the various approaches and determine their applicability domain. The two most detailed models give good results for all fire sizes, thus showing that the key parameters of flame radiation have been identified and taken into account. The simplified models are less satisfactory, and seem to be applicable only in specific conditions which are rarely met in the case of fires.

中文翻译:

表征多尺度煤油火灾火焰辐射的测量和模型

摘要 对火焰辐射的详细理解在许多火灾应用中很有用,并且可以通过实验和建模来改进:这里介绍的工作对这两个方面都有贡献。收集煤油池火灾(30-250 厘米宽)的数据,以表征火焰几何形状和发射。结果表明,平均可见火焰可以很好地近似为圆锥形。火焰中烟灰的辐射用等效吸收系数和温度来描述。结果似乎仅微弱地依赖于火灾规模,这是升级方法的宝贵信息。基于关于火焰中辐射吸收的不同假设,实验数据用于通过四种模型计算火焰外目标接收的热通量。将数值结果与实验结果进行比较,以评估各种方法并确定其适用范围。两个最详细的模型对所有火灾大小都给出了良好的结果,从而表明火焰辐射的关键参数已被识别并考虑在内。简化模型不太令人满意,似乎只适用于火灾情况下很少遇到的特定条件。
更新日期:2020-07-01
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