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Experimental study of the effects of ullage height on fire plume centerline temperature with a new virtual origin model
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2020-12-30 , DOI: 10.1016/j.psep.2020.12.025
Chunxiang Liu , Long Ding , Jie Ji

Investigating the evolution of the fire plume centerline temperature has both fundamental and practical importance to process safety, risk analysis and disaster control. In practice, ullage height (distance between the fuel surface and the container upper rim) is a common boundary condition that affects the burning intensity and the flaming characteristics. In this study, a series of experiments were conducted to reveal the effects of ullage height on the evolution of the heptane fire plume centerline temperature. The tested ullage height was systematically changed from zero to the value at which the flame self-extinguished. Results showed that, as ullage height increased, the fire plume centerline temperature first decreased and then slightly increased. By comparing the model predictions of previous classic models with the tested results, this study proved that previous classic models are not capable in predicting temperature profiles under high ullage height conditions. Based on physical and dimensionless analysis, a new virtual origin model was established to quantify the effects of ullage height on the virtual origin. A more universal plume centerline temperature model, which is capable to predict the centerline temperature profiles with any ullage height conditions, was proposed and validated by literature experimental data.



中文翻译:

虚高模型对缺料高度对火羽中心线温度影响的实验研究

研究火羽中心线温度的变化对过程安全,风险分析和灾难控制均具有根本和实际重要性。实际上,空缺高度(燃料表面和容器上边缘之间的距离)是影响燃烧强度和燃烧特性的常见边界条件。在这项研究中,进行了一系列实验以揭示缺损高度对庚烷火羽中心线温度演变的影响。测试的空缺高度从零开始系统地更改为火焰自熄的值。结果表明,随着料位高度的增加,火羽中心线温度先下降,然后略有上升。通过将先前经典模型的模型预测与测试结果进行比较,这项研究证明,以前的经典模型无法预测在高度不足高度条件下的温度曲线。基于物理和无量纲分析,建立了一个新的虚拟原点模型,以量化空缺高度对虚拟原点的影响。提出了一种更通用的羽状中心线温度模型,该模型能够预测任何缺料高度条件下的中心线温度曲线,并通过文献实验数据进行了验证。

更新日期:2020-12-30
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