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首页> 外文期刊>Building and environment >Investigation of O3-NOx-VOCs chemistry and pollutant dispersion in street canyons with various aspect ratios by CFD simulations
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Investigation of O3-NOx-VOCs chemistry and pollutant dispersion in street canyons with various aspect ratios by CFD simulations

机译：Investigation of O3-NOx-VOCs chemistry and pollutant dispersion in street canyons with various aspect ratios by CFD simulations

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Based on the OpenFOAM environment, a new CFD code named as APFoam coupling turbulence with the complex photochemical mechanism of NOx-O3-VOCs reactions has been developed. The standard k-epsilon model is selected for turbulent airflow simulation and the SAPRC07 is for complex NOx-O3-VOCs photochemical reactions. Two-dimensional(2-D) full-scale street canyons with two aspect ratios(AR = H/W = 1 and 5, W = 24 m) are stud-ied. By considering both physical effects and chemical reactions, the influences of three key factors on the photochemical pollutant dispersion and human health risk analysis are investigated, including the background wind speeds(Uref = 1.5 m/s, 3 m/s), pollutant concentrations from ambient air(O3-NOx-VOCs) and the emission (NOx-VOCs) source settings at the pedestrian-level. Besides, the effective measures to control O3 concentration is discussed.This study mainly concludes below. 1) The variations of NOx concentration increases about 20 times and O3 concentration decreases about 30% with the increase of AR. The chemical effect on photochemical pollutants is more important for the deep canyon(AR = 5) than that for the typical canyon(AR = 1). 2) The indoor and pedestrian-level exposure risk of NO2 is much larger than that of O3. The deep street canyon(AR = H/W = 5) has a higher exposure risk of NO2 than the typical canyon(AR = H/W = 1). 3) The NOx concentration increases about twice and O3 concentration decreases 6.5-13.5% with the decrease of Uref. 4) O3 concentration decreases after removing the background NOx and VOCs; it increases if there are no traffic emissions. 5) Simple traffic control measures can effectively reduce NOx but the reduction of O3 still requires additional VOCs control measures in a street canyons.

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