Abstract The butanol-diesel blended fuel possesses broad application prospects in energy industry owing to its excellent properties; thus, studying on flame spread over the blended fuel is of great significance for both scientific meanings and practical guidelines. Several fundamental parameters of flame spread, including the flame spread rate, frequency of flame oscillation, temperature distribution, and velocity of subsurface flow are characterized. Prior to analyzing the experimental data, a blended fuel flashpoint-prediction model is developed based upon Le Chatelier’s rule, Antoine’s principle, and the ideal liquid evaporation theory. For low ratio of butanol, the calculated values of the butanol-diesel blended fuel flashpoints agree well with those achieved through experimental methodology. The flame spread characteristics of the blended fuel approach those of diesel fuel as the ratio of butanol is less than 17.5%, whereas they resemble those of pure butanol fuel with the ratio of butanol beyond 17.5%. Further, an increase in the ratio of butanol leads to an increase in the flame spread rate as well as the velocity of subsurface flow. The findings of the present work are useful to provide the basic data for butanol-diesel blended fuel spilling fire, and also to develop some fire prevention measures.

中文翻译：

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丁醇-柴油混合燃料火焰蔓延的现象学表征与研究

摘要 丁醇-柴油混合燃料以其优异的性能在能源工业中具有广阔的应用前景；因此，研究混合燃料上的火焰蔓延对科学意义和实践指导意义重大。描述了火焰蔓延的几个基本参数，包括火焰蔓延速率、火焰振荡频率、温度分布和地下流动速度。在分析实验数据之前，基于 Le Chatelier 规则、Antoine 原理和理想液体蒸发理论开发了混合燃料闪点预测模型。对于低比例的丁醇，丁醇-柴油混合燃料闪点的计算值与通过实验方法获得的值非常吻合。混合燃料的火焰蔓延特性接近柴油燃料，丁醇比率小于17.5%，而它们类似于纯丁醇燃料，丁醇比率超过17.5%。此外，丁醇比例的增加导致火焰蔓延速率以及地下流动速度的增加。本工作的研究结果有助于为丁醇-柴油混合燃料泄漏火灾提供基础数据，并有助于制定一些防火措施。