Soot sheet characteristics of turbulent diffusion fire using equivalent ellipse method

IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Fire and Materials Pub Date : 2023-02-09 DOI:10.1002/fam.3130
Yubo Bi, Yanghui Hu, Shouxiang Lu, Haiyong Cong, Wei Gao, Mingshu Bi
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Abstract

This paper investigates the soot sheet characteristics of buoyant turbulent fires using laser-induced incandescence technique. Experiments are carried out for four fires using propane and nitrogen hybrid gases as fuel with propane fractions of 1.0–0.4. An equivalent ellipse method in previous literature was employed to evaluate soot sheet characteristics. The results show that soot sheet mainly exists in two kinds of morphology: one is small piece and the other is narrow and long piece. Both the probability density functions of the length and width of the equivalent ellipse and soot volume fraction of soot sheet are strongly dependent on height. In addition, the effect of propane fraction on the probability density functions is always opposite in the lower and middle part of the fires, while no obvious effect can be found in the upper part of the fires. Soot sheet number is found to increase with height except when propane fraction is 0.4. The total soot sheet number increases linearly with height within the scope of this paper.

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用等效椭圆法研究湍流扩散火灾的烟炱特性
本文利用激光诱导白炽技术研究了浮力湍流火灾的烟炱片特性。使用丙烷和氮气混合气体作为燃料,丙烷分数为1.0-0.4,对四起火灾进行了实验。采用先前文献中的等效椭圆法来评估烟炱片的特性。结果表明,煤烟片主要存在两种形态:一种是小片,另一种是细长片。等效椭圆的长度和宽度的概率密度函数以及烟炱片的烟炱体积分数都强烈依赖于高度。此外,丙烷分数对概率密度函数的影响在火灾的下部和中部总是相反的,而在火灾的上部则没有发现明显的影响。除丙烷分数为0.4外,发现烟灰片数随高度增加。总烟炱片数在本文范围内随高度线性增加。
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来源期刊
Fire and Materials
Fire and Materials 工程技术-材料科学:综合
CiteScore
4.60
自引率
5.30%
发文量
72
审稿时长
3 months
期刊介绍: Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.
期刊最新文献
Issue Information Issue Information Analyzing thermal-moisture comfort and thermal protective performance of phase change materials dripped protective clothing Effect of silane coupling agent on mechanical properties, flame retardancy, and ceramifiable behavior of ceramifiable flame-retardant silicone rubber composite Enhancing fire safety and thermal performance: Wood composites with bio-based phase change materials and fire retardants for building applications
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