A CFD modelling study of reactive pollutant dispersion in an urban street canyon

2018 International Conference on New Energy and Future Energy System

Liu, C.W.^1,2,3 ; Mei, S.J.^1,2,3 ; Zhao, F.Y.^1,2,3

School of Power and Mechanical Engineering, Wuhan University, Hubei Province Wuhan, China^1

Key Laboratory of Hydraulic Machinery Transients, Wuhan University, Ministry of Education, Hubei Province Wuhan, China^2

Hubei Key Laboratory of Accoutrement Technique in Fluid Machinery and Power Engineering, Wuhan University, Hubei Province Wuhan, China^3

关键词: Airborne pollutants;    Diffusion rules;    Photochemical smog;    Pollutant dispersions;    Pollutant sources;    Traffic pollutants;    Urban neighborhood;    Urban street canyon;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012051/pdf
DOI  :  10.1088/1755-1315/188/1/012051

来源: IOP

【 摘 要 】

This study numerically explores the diffusion rules of pollutants in an idealized urban street canyon where photochemical reactions are present in the neighbourhood. The airborne pollutants dispersion and reaction in street canyons are further investigated in this study. There is a relatively tense traffic pollutants release in urban neighborhoods, including nitrogen oxides and hydrocarbons. Photochemical reaction occurs at strong solar radiation, forming photochemical smog and other environment issues. We selected typical O3 + NO→O2 + NO2 reactions. Effects of the pollutant source location on pollutant dispersion and reaction are also investigated. Numerical simulations were conducted on chemically activity reactive air nitrogen oxides in urban street canyons with W (street canyon wide)/H (building height) = 1. Provided three different locations from the line source street canyon bottom exhaust nitric oxide diffusion and react with ozone in the free stream. The chemical reaction has a significant impact on the concentration of pollutants in the valley volume.