热钢球和铝球降落在纤维素燃料床上的燃烧着火行为

C. Zak, J. Urban, V. Tran, A. Fernandez-Pello
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引用次数: 20

摘要

金属热颗粒对可燃物质的引燃是一种重要的火灾引燃途径,但研究较少。本文研究了粉末纤维素燃料床在不同直径和初始温度的钢球和铝球的燃烧着火行为。了解这种情况下的点火可以深入了解金属颗粒引发荒地火灾和工业火灾的机制。在这方面的早期工作表明,点火倾向与温度和球的直径有关系。然而,人们对控制这种关系的物理过程知之甚少。这项工作提供了关于点火所需条件的进一步信息,并为预测可燃燃料床的点火倾向的理论框架的发展提供了有用的观察。在测试条件下,粉末纤维素的点火似乎在两种情况下表现出限制行为:对于较大的球体,温度低于600℃不会点燃纤维素;对于直径低于2.38 mm的钢或2.03 mm的铝球体,温度高达1100℃也不会点燃纤维素。我们还观察到,在球体直径4-8毫米的范围内,给定直径的铝球比钢球更容易引起点火。这似乎是由于铝球在高于657.2℃的温度下是熔融的;熔化通过熔化的潜热为球体提供大量能量,并使球体在撞击过程中变形和飞溅。此外,高速纹影视频的定性分析显示了不同的热解和点火行为,并表明不同的控制过程可能对不同尺寸的球体以及熔融和固体球体起作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flaming Ignition Behavior of Hot Steel and Aluminum Spheres Landing in Cellulose Fuel Beds
The ignition of combustible material by hot metal particles is an important fire ignition pathway that remains relatively unstudied. In this work, the flaming ignition behavior of powdered cellulose fuel beds by hot steel and aluminum spheres of various diameters and initial temperatures was studied. Understanding ignition in this scenario could offer insight into the mechanisms by which metal particles initiate wildland fires and fires in industrial settings. Earlier work on this topic has shown that ignition propensity has a relationship with the temperature and diameter of the sphere. However, little is known about the physical processes governing this relationship. This work provides further information regarding the conditions required for ignition, and useful observations for the development of a theoretical framework for predicting ignition propensity of combustible fuel beds. For the conditions tested, powdered cellulose ignition appears to exhibit limiting behavior in two regimes: for larger spheres, temperatures below 600 C did not ignite the cellulose and spheres with diameters below 2.38 mm for steel or 2.03 mm for aluminum and temperatures up to 1100 C did not ignite the cellulose either. We also observed that in the range of sphere diameters from 4-8 mm, aluminum spheres of a given diameter are more likely to cause ignition than their steel counterparts. This seems to be due to the fact that the aluminum spheres are molten at temperatures greater than 657.2 C; melting contributes to a spheres bulk energy through the latent heat of melting and allows for sphere deformation and splatter during impact. Furthermore, qualitative analysis of high speed schlieren videos shows differences in pyrolysis and ignition behavior and suggests that, different controlling processes may be at work for spheres of different sizes and for molten versus solid spheres.
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