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首页> 外文期刊>Journal of Wind Engineering and Industrial Aerodynamics: The Journal of the International Association for Wind Engineering >Large Eddy Simulation of wind flow impact on fire-induced indoor and outdoor air pollution in an idealized street canyon
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Large Eddy Simulation of wind flow impact on fire-induced indoor and outdoor air pollution in an idealized street canyon

机译：理想涡流峡谷中风流对火灾引起的室内外空气污染的大涡模拟

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The Fire Dynamics Simulator (FDS) using the Large Eddy Simulation (LES) method was employed to investigate the effects of wind on plume dispersion generated by compartment fire and the level of air pollution inside an idealized street canyon and the surrounding buildings. The purpose of this study was to assess the exposure of the occupants in building compartments with openings oriented towards the street and for the pedestrians on the street at ground level. The numerical results indicate that there is strong interaction between wind flow and in-canyon fire plume flow. The flow field patterns in the canyon restrict the air inflow, cause the fire plume dispersion inside and over the canyon, and push the smoke into the building compartments. Larger quantities of air in the fire compartment result in lower concentrations of carbon monoxide, higher concentrations of carbon dioxide, and smoke dilution. Larger quantities of air in the outer plume, due to the dilution effect, reduce the concentrations and temperature of the pollutants in the street and the buildings. These results can be used not only to assess the air pollution level under extreme conditions such as a fire accident, but also in urban planning and air quality control strategies aimed at reducing the air pollution level within urban areas. (C) 2016 Elsevier Ltd. All rights reserved.
机译：采用大涡模拟（LES）方法的火灾动力学模拟器（FDS），研究风对车厢火灾产生的烟羽散布的影响以及理想化的街道峡谷和周围建筑物内空气污染水平的影响。这项研究的目的是评估建筑物隔室中居住者的暴露程度，这些居住者的开口朝向街道，地面上的行人也应注意。数值结果表明，风流与峡谷内火羽流之间存在很强的相互作用。峡谷中的流场模式限制了空气的流入，导致火焰在峡谷内外散布，并将烟雾推入建筑物隔室。防火室内的大量空气导致一氧化碳浓度降低，二氧化碳浓度升高和烟雾稀释。由于稀释作用，外羽流中的空气量较大，从而降低了街道和建筑物中污染物的浓度和温度。这些结果不仅可以用于评估火灾等极端情况下的空气污染水平，还可以用于旨在降低市区内空气污染水平的城市规划和空气质量控制策略中。 （C）2016 Elsevier Ltd.保留所有权利。

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