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树干高度耦合壁面热效应对城市街谷内污染扩散的影响研究

姬蓉 姚成 崔鹏义 黄远东 罗杨 杨瑞涛

姬蓉,姚成,崔鹏义,等.树干高度耦合壁面热效应对城市街谷内污染扩散的影响研究[J].环境工程技术学报,2024,14(3):808-817 doi: 10.12153/j.issn.1674-991X.20230864
引用本文: 姬蓉,姚成,崔鹏义,等.树干高度耦合壁面热效应对城市街谷内污染扩散的影响研究[J].环境工程技术学报,2024,14(3):808-817 doi: 10.12153/j.issn.1674-991X.20230864
JI R,YAO C,CUI P Y,et al.Study on the influence of wall thermal effect coupled with tree trunk height on pollution diffusion in urban street canyons[J].Journal of Environmental Engineering Technology,2024,14(3):808-817 doi: 10.12153/j.issn.1674-991X.20230864
Citation: JI R,YAO C,CUI P Y,et al.Study on the influence of wall thermal effect coupled with tree trunk height on pollution diffusion in urban street canyons[J].Journal of Environmental Engineering Technology,2024,14(3):808-817 doi: 10.12153/j.issn.1674-991X.20230864

树干高度耦合壁面热效应对城市街谷内污染扩散的影响研究

doi: 10.12153/j.issn.1674-991X.20230864
基金项目: 国家自然科学基金项目(42277477)
详细信息
    作者简介:

    姬蓉(1997—),女,硕士研究生,主要研究方向为大气环境质量及模拟,212292121@st.usst.edu.cn

    通讯作者:

    崔鹏义(1986—),男,副教授,主要研究方向为大气环境质量及模拟,pycui@usst.edu.cn

  • 中图分类号: X51

Study on the influence of wall thermal effect coupled with tree trunk height on pollution diffusion in urban street canyons

  • 摘要:

    在半封闭的街道峡谷内,交通排放和二次污染物容易在通风不良的区域积聚,严重威胁人们的健康。在影响街道峡谷流场和污染物扩散特性的诸多因素中,太阳辐射引起的壁面热浮力以及不同树干高度对空气动力学的影响一直没有得到足够的重视。通过设置5种树干高度(0.18H、0.40H、0.62H、0.84H、1.06HH为建筑高度)耦合4种壁面加热配置,研究不同树干高度(耦合树木遮阴效应)和墙体加热条件对城市街道峡谷内气流流动和污染物扩散的影响。结果表明,不同树干高度及壁面热效应对城市街道峡谷内气流流动和污染物扩散有显著影响。当树干高度低于建筑物高度时,壁面加热产生的热浮力作用会降低街谷内污染物浓度并增强通风性能;当树干高度超过建筑物高度时,迎风面加热所产生的热浮力会对污染物扩散造成阻碍。采用全壁面加热能够实现更低的污染物积累。研究结果可为城市绿色设施的优化设计,实现对局部微气候环境和空气质量精准调控提供技术指导。

     

  • 图  1  不同绿化高度配置城市街道峡谷物理模型

    Figure  1.  Physical model of city street canyon configured with different tree trunk heights

    图  2  计算域和网格独立性分析

    Figure  2.  Computational domain and grid independence analysis

    图  3  等温条件下不同树干高度街道峡谷内的流场及污染物无量纲浓度分布

    Figure  3.  Flow fields and dimensionless concentration distributions in street canyons with varying trunk heights under isothermal conditions

    图  4  背风面加热条件下不同树干高度街道峡谷内的流场及污染物无量纲浓度分布

    Figure  4.  Flow fields and dimensionless concentration distributions in street canyons with varying trunk heights under leeward wall heating

    图  5  迎风面加热下不同树干高度街道峡谷内的流场及污染物无量纲浓度分布

    Figure  5.  Flow fields and dimensionless concentration distributions in street canyons with varying trunk heights under windward wall heating

    图  6  全壁面加热条件下不同树干高度街道峡谷内的流场及污染物无量纲浓度分布

    Figure  6.  Flow fields and dimensionless concentration distributions in street canyons with varying trunk heights under full wall heating

    图  7  不同树木高度下背风面、迎风面以及人行呼吸高度面污染物平均无量纲浓度

    Figure  7.  Average dimensionless concentrations on leeward, windward and pedestrian breathing height under varying tree trunk heights

    图  8  背风面、迎风面以及人行呼吸高度面的NEV*

    Figure  8.  NEV* under the leeward, windward and pedestrian breathing height planes

    表  1  树干高度耦合壁面热效应工况

    Table  1.   Trunk height coupled wall thermal effect conditions

    树干高度 等温街谷(不加热) 背风面加热 迎风面加热 全加热
    0.18H
    0.40H
    0.62H
    0.84H
    1.06H
    下载: 导出CSV

    表  2  实际尺度与模型尺度条件下的风速、温差及对应Ri

    Table  2.   Wind speed, temperature difference and corresponding Ri under actual and model scale conditions

    Ri H/m Uref/(m/s) Tw / K Tref/K ΔT=(Tw−Tref)/K 模型类型
    0 25 4.5 293 293 0 实际模型
    0.25 1.5 293 293 0 缩尺模型
    0.5 25 4.5 306 293 13 实际模型
    0.25 1.5 427 293 134 缩尺模型
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-12-02
  • 录用日期:  2024-03-11
  • 修回日期:  2024-01-04

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