隧道火灾中带有分叉羽流的最高顶棚温度建模

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL
Tianhang Zhang , Ganyu Wang , Jiangdong Li , Ke Wu , Lizhong Wang
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引用次数: 0

摘要

评估隧道火灾引起的温度分布对火灾探测和结构损坏评估具有重要意义。本研究引入了一种特殊的烟羽模型,即 "烟羽分叉",并从理论上分析了其对温度分布的影响。通过全尺寸隧道火灾实验和数值模拟,研究了不同热释放率和通风条件下的烟羽演变。结果表明,在强通风条件下,烟流会分裂成两个子流,形成上升时的多维烟流运动模式。以纵向垂直偏转角θv和横向分叉角θh量化的子烟流撞击点位置与火灾热释放率和通风条件相关。当无量纲通风速度 V′≤0.33 时,烟羽分叉角为 0,表示为单流烟羽;当 V′>0.33 时,烟羽分叉角随 V′ 的增大而迅速增大,然后缓慢减小,表示烟羽分叉随通风速度的增大而突然发生并呈衰减趋势。最后,提出了一种基于羽流分叉的新型模型来估算最高天花板温度。这项研究揭示了多维烟雾运动在重塑温度场中的作用,为深入理解纵向通风隧道火灾中的烟雾传输行为提供了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modelling the maximum ceiling temperature with bifurcated plume in tunnel fires

Evaluation of the temperature profile induced by tunnel fire is of great significance for fire detection and structural damage assessment. In this work, a special plume model, namely, the “plume bifurcation” is introduced, and its impact on the temperature distribution is analysed theoretically. Full-scale tunnel fire experiments and numerical simulations are conducted to investigate the plume evolution under various heat release rates and ventilation conditions. Results show that the plume will sperate into two sub-streams under strong ventilation condition, resulting in the multi-dimensional plume movement pattern when rising. The sub-plume impingement point location, quantified by the longitudinal vertical deflection angle θv and horizontal bifurcation angle θh, is correlated with the fire heat release rate and ventilation condition. The plume bifurcation angle is 0 when the dimensionless ventilation velocity V0.33, marking a single-stream plume; and rapidly increase and then slowly decrease with V when V>0.33, representing the sudden occurrence and decay trend of plume bifurcation with the ventilation velocity. Finally, a novel bifurcated plume-based model to estimate the maximum ceiling temperature is proposed. This study reveals the role of multi-dimensional smoke movement in reshaping the temperature field, providing new perspectives for a deeper understanding of the smoke transport behaviour in longitudinally ventilated tunnel fires.

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来源期刊
Fire Safety Journal
Fire Safety Journal 工程技术-材料科学:综合
CiteScore
5.70
自引率
9.70%
发文量
153
审稿时长
60 days
期刊介绍: Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.
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