乙醇池火燃烧行为实验分析

Burning Behavior of Ethanol Pool Fire

摘要

为了探究乙醇池火的火焰和燃烧特性,在全尺度隧道内搭建了油池火实验平台,研究了单一火源与双火源燃烧工况下油池火的燃烧行为,分析了燃烧过程中火焰高度、温度分布及脉动频率的变化规律.结果表明:油池火的火焰高度与油盘当量直径呈显著线性关系；纵向火焰温度分布与 McCaffrey 无量纲模型高度吻合,但双油盘燃烧时因火焰规模扩大导致无量纲温度略有升高；基于实验数据修正了火焰脉动频率的比例系数 K 为 0.52.根据以上结果,修正了矩形乙醇池火无量纲火焰温度、火焰高度和火焰脉动频率的预测模型.

Abstract

To investigate the flame and burning characteristics of ethanol pool fires, a pool fire experimental platform was built in a full-scale tunnel. The burning behavior of pool fires under single-fire and double-fire burning conditions was studied, respectively. The variation of flame length, temperature distribution and pulsation frequency during the burning process was analyzed. The results show that there is a significant linear relationship between the flame length of pool fires and the equivalent diameter of the fuel pan. The longitudinal flame temperature distribution is in good agreement with the McCaffrey dimensionless model, but the dimensionless temperature increases slightly in the case of double-fuel-pan burning due to the expanded fire scale. The proportional coefficient K of the flame pulsation frequency is revised to 0.52 based on the experimental data. According to the above results, the prediction models for the dimensionless flame temperature, flame length and flame pulsation frequency of rectangular ethanol pool fires are modified.

关键词

油池火 / 燃烧行为 / 火焰高度 / 脉动频率

Key words

pool fire / burning behavior / flame length / pulsation frequency

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基金资助

建筑安全与环境国家重点实验室/国家建筑工程技术研究中心开放基金资助项目(BSBE2023-09)