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| 壁面热效应对建筑群外风场及污染物扩散影响的数值分析 |
| Numerical analysis of wall thermal effects on wind environment and pollutant diffusion around building clusters |
| 投稿时间：2024-10-07 |
| DOI：10.13259/j.cnki.eri.2026.02.001 |
| 中文关键词: 热效应 风环境 污染物 数值模拟 |
| 英文关键词:thermal effect wind environment pollutant numerical simulation |
| 基金项目: |
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| 摘要点击次数: 286 |
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| 中文摘要: |
| 利用realizable k–ε紊流模型模拟屋顶和不同建筑壁面加热下的建筑群外流场、温度场及浓度场。与无加热时相比，理查森数Ri为0.84时壁面热效应未改变建筑附近气流运动的主要特点，但会影响行人高度处及近壁面气流的强弱。地面加热会明显增强建筑间的主涡及地面附近的流动，背风面加热时的情况与地面加热时的基本相似，但影响程度略弱，而迎风面加热时的情况则相反。壁面加热对建筑外气流温度的影响较小，除紧邻壁面处外，大部分区域的气流与来流的温差均小于3 K。当污染源位于上游地面处时，建筑间的主涡使地面处有较强的反向回流，下游建筑附近的污染物浓度均不高，但壁面和屋顶加热加剧了污染物向下游的扩散，同时不同壁面加热时污染物浓度分布有一定差别，且与流场有对应关系。 |
| 英文摘要: |
| The realizable k-ε turbulence model was employed to simulate the flow field, temperature field, and concentration field around a building cluster under roof and wall heating conditions. Compared with the no-heating case, the wall thermal effect at a Richardson number (Ri) of 0.84 does not alter the main flow characteristics near the buildings but does affect the flow intensity at pedestrian level and near the wall surfaces. Ground heating significantly enhances the primary vortex between buildings and the near-ground flow. Leeward wall heating produces an effect similar to ground heating, albeit slightly weaker, whereas windward wall heating exhibits the opposite trend. The influence of wall heating on the air temperature outside the buildings is minor. Except in regions immediately adjacent to the walls, the temperature difference between the local airflow and the incoming flow is less than 3 K in most areas. When the pollution source is located on the upstream ground, the main vortex between buildings induces strong reverse flow near the ground, resulting in low pollutant concentrations near the downstream buildings. Wall and roof heating evidently enhance the downstream diffusion of pollutants. Furthermore, the distribution of pollutant concentrations varies with different wall heating conditions and corresponds to the flow field characteristics. |
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