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| 建筑物布局对街道交叉口内气流和污染扩散的影响 |
| Impact of Building Arrangement on the Airflow and Pollutant Dispersion in a Street Intersection |
| 投稿时间：2015-06-05 |
| DOI：10.13259/j.cnki.eri.2017.03.002 |
| 中文关键词: 气流 污染扩散 建筑物偏移 街道交叉口 数值模拟 |
| 英文关键词:airflow pollutant dispersion building offset street intersection numerical simulation |
| 基金项目: |
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| 中文摘要: |
| 采用Fluent软件对7种不同建筑物偏移量Δy（Δy=0、1/6W、1/3W、1/2W、2/3W、5/6W和W，其中：W为街道宽度）下的交叉口内气流和污染扩散进行了三维数值模拟.模拟结果表明，建筑物偏移量对交叉口内气流运动和污染扩散具有显著影响.1/6W的偏移量已足以在侧向街道内产生明显的次生流；当偏移量由1/6W增加到1/3W时，侧向街道内的速度场显著增强；而当偏移量分别为1/2W、2/3W、5/6W和W时，侧向街道内的风速已与上风街道内的风速相当.随偏移量的增加，侧向街道和交叉口的空气交换增强而下风街道与交叉口的空气交换减弱.随着偏移量的增加，从上风街道尾端点源扩散到侧向街道内的污染物增加. |
| 英文摘要: |
| 3-D numerical simulation was performed using Fluent software to evaluate the airflow and pollutant dispersion in a street intersection under seven different building offsets of Δy=0,1/6W,1/3W,1/2W,2/3W,5/6W and W.The results revealed clearly that the airflow and pollutant dispersion in a street intersection were influenced significantly by the building offset.The offset of 1/6W was sufficient to develop the secondary flow well in the lateral streets.As the offset increased from 1/6W to 1/3W,the velocity fields in the lateral streets were strengthened significantly.In the cases with the offset of 1/2W,2/3W,5/6W and W,the wind velocity in the lateral streets was comparable with that in the upwind street.The velocity field in the downwind street became weaker as the offset increased.As the offset increased,the air exchange between the lateral streets and the intersection was strengthened while the air exchange was weakened between the intersection and the downwind street.As the offset increased,more pollutants were transported into the lateral streets from the point source,which situated at the end of the upwind street. |
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