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首页> 外文期刊>Atmosphere >Numerical Study on the Urban Ventilation in Regulating Microclimate and Pollutant Dispersion in Urban Street Canyon: A Case Study of Nanjing New Region, China
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Numerical Study on the Urban Ventilation in Regulating Microclimate and Pollutant Dispersion in Urban Street Canyon: A Case Study of Nanjing New Region, China

机译：城市通风调节城市街道峡谷微气候和污染物扩散的数值研究-以南京新区为例

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摘要

Urban ventilation plays an important role in regulating city climate and air quality. A numerical study was conducted to explore the ventilation effectiveness on the microclimate and pollutant removal in the urban street canyon based on the rebuilt Southern New Town region in Nanjing, China. The RNG k ? ε turbulence model in the computational fluid dynamics (CFD) was employed to study the street canyon under parallel and perpendicular wind directions, respectively. Velocity inside of the street canyon and temperature on the building envelopes were obtained. A novel pressure coefficient was defined, and three methods were applied to evaluate the urban ventilation effectiveness. Results revealed that there was little comfort difference for the human body under two ventilation patterns in the street canyon. Air stagnation occurred easily in dense building clusters, especially under the perpendicular wind direction. In addition, large pressure coefficients ( C P > 1 ) appeared at the windward region, contributing to promising ventilation. The air age was introduced to evaluate the “freshness” of the air in the street canyon and illustrated the ventilation effectiveness on the pollutant removal. It was found that the young air distributed where the corresponding ventilation was favorable and the wind speed was large. The results from this study can be useful in further city renovation for the street canyon construction and municipal planning.
机译：城市通风在调节城市气候和空气质量中起着重要作用。进行了数值研究，探讨了基于南京重建的南部新城地区的城市街道峡谷中微气候和污染物去除的通风效果。 RNG k？在计算流体动力学（CFD）中使用ε湍流模型分别研究了平行和垂直风向下的街道峡谷。获得了街道峡谷内部的速度和建筑物围护结构上的温度。定义了一个新的压力系数，并应用了三种方法来评估城市通风效果。结果表明，在街道峡谷的两种通风方式下，人体的舒适度差异很小。在密集的建筑群中，特别是在垂直风向下，容易发生空气停滞。另外，在迎风区域出现了较大的压力系数（C P> 1），有助于通风。引入了空气年龄以评估街道峡谷中空气的“新鲜度”，并说明了通风对污染物去除的有效性。发现年轻的空气分布在相应的通风良好且风速大的地方。这项研究的结果可用于进一步的城市改造，以进行街道峡谷建设和市政规划。

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