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| 来流风向对不同高度街谷内污染物扩散的影响 |
| Impact of incoming wind direction on pollutant dispersion in street canyons of different heights |
| 投稿时间：2024-11-11 |
| DOI：10.13259/j.cnki.eri.2026.02.002 |
| 中文关键词: 街谷 来流风向 建筑高度 数值模拟 空气交换率 污染物 |
| 英文关键词:street canyon inflow wind direction building height numerical simulation air exchange rate pollutant |
| 基金项目:国家自然科学基金资助项目（12202279） |
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| 中文摘要: |
| 以三维孤立街谷为研究对象，采用经风洞实验验证的数值模型研究了来流风向及建筑高度比对街谷内气流运动及污染物扩散的影响。结果表明：在相同来流风向下，升阶式街谷最有利于污染物扩散。90°来流风向下街谷内污染物浓度均高于45°来流风向下同类型街谷内的污染物浓度，说明在城市规划中应避免街谷轴线与当地主导风向垂直。经比较发现，升阶式街谷在两种来流风向下均表现出良好的通风性能。通过探讨不同来流风向下对称和非对称街谷内气流运动及污染物扩散特性，获取了有助于改善街谷内空气质量的街谷构型。研究可为城市规划设计中优化城市街谷布局、改善城市地区空气质量提供参考。 |
| 英文摘要: |
| This study focuses on three-dimensional isolated street canyons and employs a numerical model validated by wind tunnel experiments to investigate the effects of inflow wind direction and building height ratio on airflow and pollutant dispersion within the canyons. The results indicate that, under the same wind direction, step-up canyons are the most conducive to pollutant dispersion. Pollutant concentrations in canyons with a 90° inflow wind direction are consistently higher than those in similar canyons under a 45° inflow wind direction, suggesting that urban planning should avoid aligning canyon axes perpendicular to the prevailing local wind direction. A comprehensive comparison of the effects of inflow wind direction and building height ratio reveals that step-up canyons exhibit good ventilation performance under both wind directions. By exploring the airflow and pollutant dispersion characteristics in symmetric and asymmetric canyons under varying inflow wind directions, this study identifies canyon configurations that can help improve air quality. The findings provide a reference for optimizing urban canyon layouts and enhancing air quality in urban areas during urban planning and design. |
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