Analyzing the ignition capabilities of glowing firebrand accumulations

IF 5.3 2区工程技术 Q2 ENERGY & FUELS

Proceedings of the Combustion Institute Pub Date : 2024-08-21 DOI:10.1016/j.proci.2024.105746

Luqing Zhu, James L. Urban

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引用次数: 0

Abstract

Firebrand spotting is a significant mechanism for structure losses in wildland–urban interface (WUI) fires. In this work, the ability of firebrand accumulations to cause flaming ignition of an engineered wood material, Oriented Strand Board (OSB), under different flow conditions was experimentally studied. The firebrands were emulated by burning wooden dowels of two sizes, 6.35 & 12.7 mm. Firebrands were dropped onto on the fuel to form accumulations, with the coverage densities of 0.06 to on the fuel surface. The surface temperature of glowing combustion on the firebrands was measured with color ratio pyrometry. The ignition outcome results show a similar hyperbolic relationship between air flow and coverage density for both firebrand sizes although accumulations of small firebrands can cause the ignition faster. A firebrand combustion model was adopted to predict the surface temperature of accumulated firebrands considering re-radiation between nearby firebrands. A correlation between the ignition time and characteristics of accumulations was also established based on a theoretical combustion and heat transfer analysis.

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分析发光火种积聚的点燃能力

在野外-城市交界（WUI）火灾中，火烧斑是造成结构损失的一个重要机制。在这项研究中，我们通过实验研究了在不同流动条件下，火种累积导致工程木质材料定向刨花板（OSB）燃烧的能力。通过燃烧两种尺寸（6.35 毫米和 12.7 毫米）的木钉来模拟火带。火带被投放到燃料上形成堆积，在燃料表面的覆盖密度为 0.06。用色比高温计测量了火带燃烧时的表面温度。点火结果表明，两种大小的火苗在空气流量和覆盖密度之间都存在类似的双曲线关系，但小火苗的积聚会导致更快的点火。考虑到附近火带之间的再辐射，采用了火带燃烧模型来预测积聚火带的表面温度。根据理论燃烧和传热分析，还建立了点火时间与积聚特征之间的相关性。

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

Proceedings of the Combustion Institute 工程技术-工程：化工

CiteScore

7.00

自引率

0.00%

发文量

420

审稿时长

3.0 months

期刊介绍： The Proceedings of the Combustion Institute contains forefront contributions in fundamentals and applications of combustion science. For more than 50 years, the Combustion Institute has served as the peak international society for dissemination of scientific and technical research in the combustion field. In addition to author submissions, the Proceedings of the Combustion Institute includes the Institute''s prestigious invited strategic and topical reviews that represent indispensable resources for emergent research in the field. All papers are subjected to rigorous peer review. Research papers and invited topical reviews; Reaction Kinetics; Soot, PAH, and other large molecules; Diagnostics; Laminar Flames; Turbulent Flames; Heterogeneous Combustion; Spray and Droplet Combustion; Detonations, Explosions & Supersonic Combustion; Fire Research; Stationary Combustion Systems; IC Engine and Gas Turbine Combustion; New Technology Concepts The electronic version of Proceedings of the Combustion Institute contains supplemental material such as reaction mechanisms, illustrating movies, and other data.