Numerical investigation of the temperature characteristics beneath the ceiling driven by a strong plume in a longitudinal ventilated tunnel

IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Longfei Chen, Xiaosong Li, Yunping Yang, Zhisheng Li, Tao Li, Yujie Lan, Yanqiu Chen
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Abstract

Previous studies have mainly focused on the situation that the tunnel's continuous flame region was lower than the ceiling height. For tunnels with longitudinal ventilation, the temperature characteristics of strong fire plumes are still unclear. In this paper, the maximum temperature rise beneath the ceiling for strong fire plume conditions in a small-scale tunnel is studied using fire dynamics simulator. Results show that when the effective height (the distance from the burner surface to the ceiling of the tunnel) is 0.65 m, the maximum temperature rise beneath the ceiling in this work shows a good correlation with Li's model and Kurioka's model. However, as the effective height decreases to 0.55 and 0.50 m, the maximum temperature rise would be significantly lower than the previous model. Therefore, a dimensionless coefficient is introduced to modify the maximum temperature rise model for a strong fire plume, which involves the effective height coefficient, heat release rate, and longitudinal ventilation. A calculation model for the maximum temperature rise beneath the tunnel ceiling in the condition of strong fire plumes is established. The temperature attenuation data along the tunnel are given by statistics. The relationship between the dimensionless temperature rise and the dimensionless position parameter is established, and a unified model under various heat release rates is obtained.

对纵向通风隧道中强烟流驱动的顶棚下温度特征的数值研究
以往的研究主要集中在隧道连续火焰区域低于顶棚高度的情况。对于纵向通风的隧道而言,强火羽的温度特征仍不明确。本文利用火灾动力学模拟器研究了小规模隧道中强火羽条件下顶棚下的最大温升。研究结果表明,当有效高度(燃烧器表面到隧道顶棚的距离)为 0.65 米时,顶棚下的最大温升与 Li 的模型和 Kurioka 的模型有很好的相关性。然而,当有效高度降至 0.55 米和 0.50 米时,最大温升将明显低于之前的模型。因此,引入了一个无量纲系数来修改强火羽流的最大温升模型,其中涉及有效高度系数、热释放率和纵向通风量。建立了强火羽流条件下隧道顶棚下最大温升的计算模型。隧道沿线的温度衰减数据由统计数据给出。建立了无量纲温升与无量纲位置参数之间的关系,并获得了各种热释放率下的统一模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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.
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