理想森林火灾情景下点状粒子最大距离的计算

IF 1.5 Q3 ENGINEERING, CHEMICAL
J. Pereira, J. Pereira, André L. A. Leite, Duarte M. S. Albuquerque
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引用次数: 10

摘要

利用等效体积热源,在理想森林火灾条件下,对植被上方和植被内部的风面层进行了大涡模拟。Firebrand的颗粒被表示为球形颗粒,其大小范围很宽,以随机方式分布在燃烧体中,并以拉格朗日点的形式在上升羽流中对流。在干燥、热解、炭燃烧和燃烧过程中,热薄颗粒受到相对于流动和水分损失的阻力。在非定常三维风场中沿粒子轨迹计算粒子动量、传热传质和燃烧控制方程,直至粒子沉降到地面。将该点状距离与Albini模型在几种理想的线草或火把树火灾情景下获得的最大点状距离进行了比较。2000 kW/m短草火灾的颗粒最大点状距离预测结果与Albini模型的结果比较满意,比50000 kW/m高强度火灾的预测结果低40%。对于单棵和四棵燃烧树的情况,模型预测的最大距离一致,但颗粒直径略有不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calculation of Spotting Particles Maximum Distance in Idealised Forest Fire Scenarios
Large eddy simulation of the wind surface layer above and within vegetation was conducted in the presence of an idealised forest fire by using an equivalent volumetric heat source. Firebrand’s particles are represented as spherical particles with a wide range of sizes, which were located into the combustion volume in a random fashion and are convected in the ascending plume as Lagrangian points. The thermally thin particles undergo drag relative to the flow and moisture loss as they are dried and pyrolysis, char-combustion, and mass loss as they burn. The particle momentum, heat and mass transfer, and combustion governing equations were computed along particle trajectories in the unsteady 3D wind field until their deposition on the ground. The spotting distances are compared with the maximum spotting distance obtained with Albini model for several idealised line grass or torching trees fires scenarios. The prediction of the particle maximum spotting distance for a 2000 kW/m short grass fire compared satisfactorily with results from Albini model and underpredicted by 40% the results for a high intensity 50000 kW/m fire. For the cases of single and four torching trees the model predicts the maximum distances consistently but for slightly different particle diameter.
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来源期刊
Journal of Combustion
Journal of Combustion ENGINEERING, CHEMICAL-
CiteScore
2.00
自引率
28.60%
发文量
8
审稿时长
20 weeks
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