Influence of Wooden Compartment’s Fuel Moisture Content on Time to Flashover: An Experimental and Numerical Study

Fire Pub Date : 2024-01-04 DOI:10.3390/fire7010017

Sanjay Kumar Khattri, T. Log, A. Kraaijeveld

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Abstract

Time to flashover is an important fire safety parameter. The present study investigated the effects of fuel moisture content on the time to flashover, crucial in fire safety analysis. Experiments and simulations of an ISO 9750-1 room model at 1/8 scale were performed by varying the wooden compartment boundaries’ moisture content between 5% and 16%. The results showed a linear increase in time to flashover with fuel moisture content. An empirical model to predict the time to flashover according to the moisture content was developed. The experiments showed that increasing the moisture from 6.5% to 14.4% prolonged the flashover time from 4.6 min to 8.75 min. These experimental results are consistent with computational fluid dynamics (CFD) modeling using Fire Dynamics Simulator (FDS), which also depicts a corresponding increase in the time to flashover. These findings demonstrate the critical role of fuel moisture content in fire safety analysis. The results suggest that a 1/8-scale model can be utilized for cost-effective and easily manageable education and demonstration purposes. This includes helping fire brigades and fire academy students comprehend the significance of fuel moisture content in compartment fire development. Since the FDS modeling is not restricted to a 1/8 scale, the presented results are promising regarding CFD modeling of time to flashover in full-scale compartments.

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木制隔间的燃料水分含量对闪蒸时间的影响：实验和数值研究

闪燃时间是一个重要的消防安全参数。本研究调查了燃料含水率对闪燃时间的影响，这在火灾安全分析中至关重要。通过改变木质隔间边界的含水率（5% 至 16%），对 1/8 比例的 ISO 9750-1 房间模型进行了实验和模拟。结果表明，随着燃料含水量的增加，闪燃时间呈线性增长。根据含水率建立了预测闪燃时间的经验模型。实验表明，水分从 6.5% 增加到 14.4%，闪燃时间从 4.6 分钟延长到 8.75 分钟。这些实验结果与使用火灾动力学模拟器（FDS）进行的计算流体动力学（CFD）建模结果一致，后者也描述了闪燃时间的相应增加。这些研究结果证明了燃料含水量在火灾安全分析中的关键作用。结果表明，1/8 比例的模型可用于成本效益高且易于管理的教育和演示目的。这包括帮助消防队和消防学院的学生理解燃料含水量在隔间火灾发展中的重要作用。由于 FDS 建模并不局限于 1/8 比例，因此在对全比例隔间的闪蒸时间进行 CFD 建模方面，所展示的结果是很有前景的。

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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Fire

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