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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：城市街道峡谷监管小气候和污染物分散的城市通风的数值研究 - 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方面发挥着重要作用。进行了一个数值研究，探讨了基于中国南京南部新城地区的城市街道峡谷中小型街道峡谷中的微气候和污染物去除的通风效果。使用计算流体动力学（CFD）的RNG K-ε湍流模型分别在平行和垂直的风向下进行街道峡谷。获得了街道峡谷内部和建筑信封的温度的速度。定义了一种新的压力系数，应用了三种方法来评估城市通气效率。结果表明，街道峡谷两种通风模式下的人体几乎没有舒适差异。密集建筑物簇中容易发生空气停滞，尤其是在垂直风向下。另外，在迎风区域时出现大的压力系数（C p> 1），有助于通气。介绍了空中时代，评价街道峡谷中空气的“新鲜度”，并说明了污染物去除的通风效果。发现年轻的空气分布在相应的通风有利的地方，风速大。本研究的结果对于街头峡谷建设和市政规划的进一步城市改造有用。

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