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刘呈威, 赵福云. 街区交通污染物光化学反应及其自然通风稀释[J]. 环境化学, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
引用本文: 刘呈威, 赵福云. 街区交通污染物光化学反应及其自然通风稀释[J]. 环境化学, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
shu
LIU Chengwei, ZHAO Fuyun. Photochemical reaction with traffic pollutants in street canyon and the dilution of natural ventilation[J]. Environmental Chemistry, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
Citation: LIU Chengwei, ZHAO Fuyun. Photochemical reaction with traffic pollutants in street canyon and the dilution of natural ventilation[J]. Environmental Chemistry, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
shu

街区交通污染物光化学反应及其自然通风稀释

  • 武汉大学动力与机械学院, 武汉, 430072

    • 通讯作者: 赵福云, E-mail: fyzhao@whu.edu.cn
  • 基金项目:

    国家自然科学基金（51778504）和深圳市科技局基础研究计划（JCYJ20160523160857948）资助.

Photochemical reaction with traffic pollutants in street canyon and the dilution of natural ventilation

  • School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    • Corresponding author: ZHAO Fuyun, fyzhao@whu.edu.cn
  • Fund Project: Supported by the National Natural Science Foundation of China(51778504)and Shenzhen Municipal Science and Technology Bureau of Basic Research Program(JCYJ20160523160857948).

摘要

  • 摘要: 随着城市化进程的加剧，汽车尾气在太阳辐射作用下发生光化学反应，生成的气态污染物NOx会在街区中扩散造成环境污染，这也是光化学烟雾形成的重要环节.本文通过数值模拟的方法，将风洞实验对比验证典型高宽比1的街区峡谷模型计算的可靠性和准确性，再运用RNG k-ε湍流模型耦合NOx化学反应模型进行数值计算，探究存在光化学反应下的气态污染物在城市六街区中的扩散迁移规律.结果发现，上游街区的光化学反应程度要大于下游街区，但是因为街区自身涡旋结构的流动以及自然通风的稀释作用会慢慢将生成气态污染物迁移到下游街区中，且气态污染物会在街区背风侧形成积聚达到一定的浓度后会沉积在整个街区中.
    Abstract: With the acceleration of urbanization and the increase of urban population, vehicle exhaust lead to photochemical reaction occurred under the influence of solar radiation in urban neighborhoods, meanwhile, the gaseous pollutant NOx would diffuse into the blocks, which is also an important link in the formation of photo chemical smog. In this paper,the block model with idealized aspect ratio 1 to calculate the reliability and accuracy by a comparison of the wind tunnel experiments, transport processes for NOx with simple reactive pollutant dispersion within six blocks were modelled by using the computational fluid dynamics (CFD) together with a RNG k-ε turbulence model. The results showed that the degree of photochemical reaction in the upstream block was greater than that in the downstream block, but because of the flow of the vortex structure of the block itself and the dilution of natural ventilation, the gaseous pollutants were slowly transferred to the downstream block. The gaseous pollutants would accumulate at certain concentration on the leeward side of the block and deposit in the whole block.
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  • 收稿日期:  2018-12-17
刘呈威, 赵福云. 街区交通污染物光化学反应及其自然通风稀释[J]. 环境化学, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
引用本文: 刘呈威, 赵福云. 街区交通污染物光化学反应及其自然通风稀释[J]. 环境化学, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
shu
LIU Chengwei, ZHAO Fuyun. Photochemical reaction with traffic pollutants in street canyon and the dilution of natural ventilation[J]. Environmental Chemistry, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
Citation: LIU Chengwei, ZHAO Fuyun. Photochemical reaction with traffic pollutants in street canyon and the dilution of natural ventilation[J]. Environmental Chemistry, 2019, (9): 2008-2017. doi: 10.7524/j.issn.0254-6108.2018121702
shu

街区交通污染物光化学反应及其自然通风稀释

    通讯作者: 赵福云, E-mail: fyzhao@whu.edu.cn
  • 武汉大学动力与机械学院, 武汉, 430072
  • 收稿日期:  2018-12-17
基金项目:

国家自然科学基金（51778504）和深圳市科技局基础研究计划（JCYJ20160523160857948）资助.

摘要: 随着城市化进程的加剧，汽车尾气在太阳辐射作用下发生光化学反应，生成的气态污染物NOx会在街区中扩散造成环境污染，这也是光化学烟雾形成的重要环节.本文通过数值模拟的方法，将风洞实验对比验证典型高宽比1的街区峡谷模型计算的可靠性和准确性，再运用RNG k-ε湍流模型耦合NOx化学反应模型进行数值计算，探究存在光化学反应下的气态污染物在城市六街区中的扩散迁移规律.结果发现，上游街区的光化学反应程度要大于下游街区，但是因为街区自身涡旋结构的流动以及自然通风的稀释作用会慢慢将生成气态污染物迁移到下游街区中，且气态污染物会在街区背风侧形成积聚达到一定的浓度后会沉积在整个街区中.

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