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高层建筑群对街谷内颗粒物扩散特性的影响

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邓存宝, 金铃子, 陈曦, 王雪峰. 高层建筑群对街谷内颗粒物扩散特性的影响[J]. 环境工程学报, 2019, 13(1): 147-153. doi: 10.12030/j.cjee.201805149
引用本文: 邓存宝, 金铃子, 陈曦, 王雪峰. 高层建筑群对街谷内颗粒物扩散特性的影响[J]. 环境工程学报, 2019, 13(1): 147-153. doi: 10.12030/j.cjee.201805149
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DENG Cunbao, JIN Lingzi, CHEN Xi, WANG Xuefeng. Impact of high-rise buildings on particulate matter dispersion in urban street canyon[J]. Chinese Journal of Environmental Engineering, 2019, 13(1): 147-153. doi: 10.12030/j.cjee.201805149
Citation: DENG Cunbao, JIN Lingzi, CHEN Xi, WANG Xuefeng. Impact of high-rise buildings on particulate matter dispersion in urban street canyon[J]. Chinese Journal of Environmental Engineering, 2019, 13(1): 147-153. doi: 10.12030/j.cjee.201805149
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高层建筑群对街谷内颗粒物扩散特性的影响

  • 1.

    辽宁工程技术大学安全科学与工程学院，阜新 123000

  • 2.

    辽宁工程技术大学安全工程技术研究院，阜新 123000

  • 3.

    北京天地玛珂电液控制系统有限公司，北京 101300

  • 基金项目:

    国家自然科学基金资助项目（51704145）

Impact of high-rise buildings on particulate matter dispersion in urban street canyon

  • 1.

    College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China

  • 2.

    Research Institute of Safety Engineering and Technology, Liaoning Technical University, Fuxin 123000, China

  • 3.

    Beijing Tiandi-Marco Electro-Hydraulic Control System Company Limited, Beijng 101300, China

  • Fund Project:

  • 摘要: 为了获得城市冠层内高层建筑群的高度变化对城市颗粒物污染的作用情况，采用大涡模拟方法研究了不同高层建筑群的街谷形状因子对街谷内空气流动与污染物扩散规律的影响。结果表明：在高层建筑群上方形成一个顺时针旋涡，旋涡中心位于城市峡谷内靠近高层建筑群背风处；随着街谷形状因子的增大，高层建筑群的滞留效应增强，导致高层建筑物上方的剪切层湍动能增强；当形状因子为2.5时，湍动能达到1.9 m2·s-2，此时城市街谷内可吸入颗粒物的稀释扩散条件变差；在涡旋和气流夹带作用下，可吸入颗粒物浓度在垂直方向上分布具有明显的分层现象，大量可吸入颗粒物聚集于低建筑迎风面底部。不同街谷形状因子下街谷内空气流动与污染物扩散规律的探明将为有关部门制定相应规划提供参考。
    Abstract: In order to obtain the effects of height variation of high-rise buildings in urban canopy on the particulate pollution, large-eddy simulation was used to study the influence of street shape factors of different high-rise buildings on airflow and pollutant diffusion in the canyon. The simulation result shows that a clockwise vortex could be formed above the high-rise buildings, and its center is located near the lee of the high-rise buildings in the urban canyon. With the increase of the shape factor of the valley, the particulate-retention effect of the high-rise buildings will increase, which could strengthen the turbulent kinetic energy and air stagnation of the shear layer above the building. The dilution and diffusion conditions of the inhalable particles in the urban street canyon become worse at the shape factor of 2.5 and the turbulent kinetic energy is 1.9 m2·s-2. With the entrainment of the vortex and the airflow, an obvious concentration stratification distribution will occur in the vertical direction for the inhalable particulates, a large number of them will gather at the bottom of windward side of the low-rise buildings. To achieve the spread of particulate pollutants outside the urban street canyon, it is necessary to observe the law of airflow and pollutant diffusion with different aspect ratio, which will provide a theoretical basis for relevant government departments to formulate the corresponding policies and regulations.
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  • 刊出日期:  2019-01-08

高层建筑群对街谷内颗粒物扩散特性的影响

  • 1. 辽宁工程技术大学安全科学与工程学院，阜新 123000
  • 2. 辽宁工程技术大学安全工程技术研究院，阜新 123000
  • 3. 北京天地玛珂电液控制系统有限公司，北京 101300
基金项目:

国家自然科学基金资助项目（51704145）

摘要: 为了获得城市冠层内高层建筑群的高度变化对城市颗粒物污染的作用情况，采用大涡模拟方法研究了不同高层建筑群的街谷形状因子对街谷内空气流动与污染物扩散规律的影响。结果表明：在高层建筑群上方形成一个顺时针旋涡，旋涡中心位于城市峡谷内靠近高层建筑群背风处；随着街谷形状因子的增大，高层建筑群的滞留效应增强，导致高层建筑物上方的剪切层湍动能增强；当形状因子为2.5时，湍动能达到1.9 m2·s-2，此时城市街谷内可吸入颗粒物的稀释扩散条件变差；在涡旋和气流夹带作用下，可吸入颗粒物浓度在垂直方向上分布具有明显的分层现象，大量可吸入颗粒物聚集于低建筑迎风面底部。不同街谷形状因子下街谷内空气流动与污染物扩散规律的探明将为有关部门制定相应规划提供参考。

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