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灌木篱墙对高架桥街道峡谷内CO扩散的影响

王薇 陈昌萍 郑翥鹏 张祥敏

王薇,陈昌萍,郑翥鹏,等.灌木篱墙对高架桥街道峡谷内CO扩散的影响[J].环境工程技术学报,2024,14(3):818-825 doi: 10.12153/j.issn.1674-991X.20230755
引用本文: 王薇,陈昌萍,郑翥鹏,等.灌木篱墙对高架桥街道峡谷内CO扩散的影响[J].环境工程技术学报,2024,14(3):818-825 doi: 10.12153/j.issn.1674-991X.20230755
WANG W,CHEN C P,ZHENG Z P,et al.Influence of shrub hedge on CO diffusion in elevated bridge street canyons[J].Journal of Environmental Engineering Technology,2024,14(3):818-825 doi: 10.12153/j.issn.1674-991X.20230755
Citation: WANG W,CHEN C P,ZHENG Z P,et al.Influence of shrub hedge on CO diffusion in elevated bridge street canyons[J].Journal of Environmental Engineering Technology,2024,14(3):818-825 doi: 10.12153/j.issn.1674-991X.20230755

灌木篱墙对高架桥街道峡谷内CO扩散的影响

doi: 10.12153/j.issn.1674-991X.20230755
基金项目: 国家自然科学基金项目(52178510);福建省中青年教师教育科研项目(JAT200492)
详细信息
    作者简介:

    王薇(1999—),女,硕士研究生,主要从事风环境研究,wwang817@163.com

    通讯作者:

    陈昌萍(1971—)男,教授,研究方向为风工程与风环境,cpchen@hnu.edu.cn

  • 中图分类号: X511

Influence of shrub hedge on CO diffusion in elevated bridge street canyons

  • 摘要:

    为探究灌木篱墙布局对高架桥街道峡谷内部流场及污染物扩散的影响,将灌木篱墙假设为多孔介质,采用标准k-$ \varepsilon $模型结合组分运输方程对布置中央灌木篱墙和两侧灌木篱墙的高架桥街谷的底部和桥面道路机动车排放的CO扩散过程进行模拟,并与风洞试验结果比较。结果表明:数值模拟方法可靠,且与标准街谷不同,高架街谷中的灌木篱墙不仅不会阻碍流场运动,还能加强底部受阻风场与上部风场的对流,有利于底部道路排放污染物的扩散,能够有效降低街谷的整体污染物浓度,改善污染物在背风侧、桥体上方和底部集聚的问题。两侧均设置篱墙时风场的上下对流更强,背风面壁面处CO质量分数降低60%,增设灌木篱墙可作为改善其内部空气污染程度的有效措施。

     

  • 图  1  高架街谷二维模型示意

    Figure  1.  Schematic diagram of elevated bridge street canyon 2D model

    图  2  Gromke风洞试验[18]

    Figure  2.  Gromke's wind tunnel test

    图  3  数值模拟与风洞试验CO无量纲浓度对比

    Figure  3.  Comparison of dimensionless concentrations between numerical simulation and wind tunnel experiment for CO

    图  4  不同布局的街谷内部风速云图

    Figure  4.  Wind speed contour maps inside street canyons with different layouts

    图  5  不同布局的街谷内部流线

    Figure  5.  Streamline maps inside street canyons with different layouts

    图  6  不同布局的街谷内部CO质量分数分布云图

    Figure  6.  Cloud maps of CO mass fraction distribution inside street canyons with different layouts

    图  7  不同布局和污染源位置的街谷内部CO质量分数分布云图

    Figure  7.  Cloud maps of CO mass fraction distribution inside street canyons with different layouts and pollution source locations

    图  8  背风侧建筑物壁面处CO质量分数垂直分布

    Figure  8.  Vertical distribution of CO mass fraction at leeward building facades

    图  9  行人呼吸高度处(1.6 m)CO质量分数分布

    Figure  9.  CO mass fraction distribution at pedestrian breathing height (1.6 m)

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出版历程
  • 收稿日期:  2023-10-18
  • 录用日期:  2024-03-11
  • 修回日期:  2024-03-08

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