氧可用性对受控大气锥量热计中材料燃烧行为的影响

Damien Marquis, É. Guillaume, A. Camillo
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引用次数: 20

摘要

材料对火的反应通常是通过在受控测试条件下进行的台架实验来研究的。通常用于此目的的两种台式仪器是锥形量热计和火焰传播仪。使用这些测试设备对聚合物材料的燃烧行为进行的研究表明,压力、辐照度、流速等测试变量对结果有显著影响。尽管进行了大量的研究,但人们对氧污染和减少通风对聚合物材料燃烧行为的影响知之甚少。最近在受控氧气环境中的工作提出了解释和结果准确性的问题。本文报道了一项研究的结果,评估了氧的蒸发和减少通风对受控大气锥量热计中材料燃烧行为的影响。该研究是在典型的热塑性材料上进行的,即黑色聚甲基丙烯酸甲酯。给出并讨论了实验火灾条件对实验结果的依赖性。实验表明,入口气流速率是研究高分子材料在围护结构内燃烧行为时需要考虑的主要因素。它强烈影响可反应的可用氧气量,并可能导致在研究氧气影响时对结果的误解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of oxygen availability on the combustion behaviour of materials in a controlled atmosphere cone calorimeter
The reaction-to-fire of materials is commonly studied with bench scale experiments conducted under controlled test conditions. Two bench-scale instruments commonly used for this purpose are the cone calorimeter and the fire propagation apparatus. Research performed with these test apparatuses on the burning behaviour of polymeric materials has demonstrated the significant effect on the results of test variables such as pressure, irradiance, flow velocity, etc. In spite of the fairly large number of studies, little is known concerning the effect of oxygen vitiation and reduced ventilation on the burning behaviour of polymeric materials. Recent work in a controlled oxygen environment raises the question of interpretation and accuracy of the results. This paper reports the results of a study to evaluate the effect of oxygen vitiation and reduced ventilation on the burning behaviour of materials in a controlled atmosphere cone calorimeter. The study was performed on a typical thermoplastic material, i.e., a black poly(methyl)methacrylate. The dependence of the results on the experimental fire conditions is presented and discussed. The experiments show that the inlet airflow rate is a major factor to consider when studying the burning behaviour of polymeric materials in an enclosure. It strongly affects the available amount of oxygen that can react and may lead to a misinterpretation of the results when the effects of oxygen are studied.
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