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首页> 美国卫生研究院文献>Elsevier Public Health Emergency Collection >Wind-induced natural ventilation of re-entrant bays in a high-rise building
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Wind-induced natural ventilation of re-entrant bays in a high-rise building

机译：高层建筑折返海湾的风致自然通风

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摘要

This paper reports a systematic computational study of wind-induced natural ventilation and pollutant transport of re-entrant bays on a total of 30 generic building models of different building heights and with bays of different dimensions. Mean wind flow around each building model and wind-induced flow inside re-entrant bays are computed. To determine the ventilation efficiency of the bay, the computed flow field is used to disperse a scalar pollutant initially occupying the entire bay at a uniform concentration. The subsequent time decay of pollutant concentration inside the bay is studied and the ventilation efficiency is quantified by the retention time. The results show that wind-induced flow inside the bay, especially on the building side face, is complex and highly three-dimensional. Air exchange rates through the roof opening and vertical side opening are analyzed for each bay and their relationship to the ventilation efficiency is discussed. The bays on the building side faces are much worse ventilated than those on the windward or leeward building face. The deeper the side bay, the worse is the air exchange and ventilation. The building height is found to have a governing effect on the ventilation of the windward and leeward re-entrant bays.
机译：本文报告了共30个不同建筑物高度和不同尺寸海湾的通用建筑模型对折返海湾风致自然通风和污染物迁移的系统计算研究。计算每个建筑模型周围的平均风流和折返海湾内的风流。为了确定舱室的通风效率，计算出的流场用于分散最初以均匀浓度占据整个舱室的标量污染物。研究了海湾内部污染物浓度随后的时间衰减，并通过停留时间来量化通风效率。结果表明，海湾内部，尤其是建筑物侧面的风致流动是复杂的，并且是高度三维的。分析了每个舱室通过屋顶开口和垂直侧面开口的空气交换率，并讨论了它们与通风效率的关系。建筑物侧面的通风孔比迎风面或背风的通风孔差。侧托架越深，空气交换和通风越差。发现建筑物的高度对迎风区和背风折返区的通风有控制作用。

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