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Research Article

Transport characteristics of PM2.5 inside urban street canyons: The effects of trees and vehicles

Xinming Jin, Lijun Yang( ), Xiaoze Du, Yongping Yang
Key Laboratory of Condition Monitoring and Control for Power Plant Equipments of Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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Abstract

Particles emitted from vehicles can threaten human health. Therefore the investigations about the particle dispersion characteristics inside the street canyon are of significance. For the current work, the airflow fields and the particle movement inside an isolated street canyon with three aspect ratios under perpendicular wind direction and two typical wind speeds are studied numerically, for which the particle distributions are obtained by solving the drift-flux model. The conclusions demonstrate that the trees will result in the particles gathering. However, the particle deposition fluxes on the trees are so small which cannot effectively remove the particles from the ambient air. Besides, the vehicles tend to cluster particles around the street axis and slow down the dispersion to the curbside buildings. Therefore, the vehicles should not be ignored in the numerical models, especially for the cases in the wind direction of 90°. Moreover the cases with the aspect ratio of 0.5 are more sensitive to the effects of trees and vehicles. The shop vendors expose to the highest particle concentrations in most of the scenarios.

Keywords

street canyonairflow patternPM2.5trees and vehicles

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Building Simulation
Volume 10 Issue 3,
June 2017
Pages 337-350
DOI: 10.1007/s12273-016-0324-1
Cite this article:
Jin X, Yang L, Du X, et al. Transport characteristics of PM2.5 inside urban street canyons: The effects of trees and vehicles. Building Simulation, 2017, 10(3): 337-350. https://doi.org/10.1007/s12273-016-0324-1

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Received: 09 June 2016
Revised: 24 July 2016
Accepted: 10 August 2016
Published: 28 September 2016
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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