The effect of exhaust emissions from a group of moving vehicles on pollutant dispersion in the street canyons

Tianhao Shi; Tianzhen Ming; Yongjia Wu; Chong Peng; Yueping Fang; Renaud  de_Richter

doi:10.1016/j.buildenv.2020.107120

The effect of exhaust emissions from a group of moving vehicles on pollutant dispersion in the street canyons

Tianhao Shi, Tianzhen Ming, Yongjia Wu, Chong Peng, Yueping Fang, Renaud de_Richter

School of Energy, Construction and Environment

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

302 Downloads (Pure)

Abstract

Moving vehicles are the primary emission source of road pollution and the vehicle-induced turbulence (VIT) affecting the flow field in the street canyon. This paper used the dynamic mesh updating method to simulate the air pollution under the real situation of vehicle movement and exhaust emission in the street canyon. The dispersion characteristics of vehicular exhaust under various vehicle arrangements were analyzed. The personal intake fraction (P_IF) was introduced as an index to analyze the impact of factors such as vehicle speed and ambient wind velocity on the pollution exposure level of pedestrians. Based on the general assumptions in the study of street canyon pollution that vehicle-induced turbulence (VIT) is a continuous turbulence source and vehicle exhaust pollutants is a uniform pollution source, the conditions of the hypothesis are preliminarily explored. The research indicates that VIT can be regarded as a continuous turbulence source when vehicles maintain a “safe distance” on the road and form a stable traffic flow. Moreover, according to the range of dispersion of exhaust pollution, a “healthy distance” was proposed to guide driver to avoid direct impact of exhaust emitted from the vehicles in front.

Original language	English
Article number	107120
Journal	Building and Environment
Volume	181
Early online date	23 Jul 2020
DOIs	https://doi.org/10.1016/j.buildenv.2020.107120
Publication status	Published - 15 Aug 2020

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Building and Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Building and Environment, 181 (2017)
DOI: 10.1016/j.buildenv.2020.107120

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Funder

This study was financially supported by the National Natural Science Foundation of China (Grant No. 51778511, 51778253), the Hubei Provincial Natural Science Foundation of China (Grant No. 2018CFA029), the Key Project of ESI Discipline Development of Wuhan University of Technology (WUT Grant No. 2017001), and the Fundamental Research Funds for the Central Universities (WUT Grant No. 2019IVB082).

Keywords

Vehicular exhaust, Pollution dispersion
Street canyon, Vehicle arrangement
Vehicle-induced turbulence
Personal intake fraction (P_IF)

ASJC Scopus subject areas

General Engineering
General Environmental Science

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10.1016/j.buildenv.2020.107120

Post-PrintAccepted author manuscript, 3.05 MBLicence: CC BY-NC-ND

Cite this

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title = "The effect of exhaust emissions from a group of moving vehicles on pollutant dispersion in the street canyons",

abstract = "Moving vehicles are the primary emission source of road pollution and the vehicle-induced turbulence (VIT) affecting the flow field in the street canyon. This paper used the dynamic mesh updating method to simulate the air pollution under the real situation of vehicle movement and exhaust emission in the street canyon. The dispersion characteristics of vehicular exhaust under various vehicle arrangements were analyzed. The personal intake fraction (P_IF) was introduced as an index to analyze the impact of factors such as vehicle speed and ambient wind velocity on the pollution exposure level of pedestrians. Based on the general assumptions in the study of street canyon pollution that vehicle-induced turbulence (VIT) is a continuous turbulence source and vehicle exhaust pollutants is a uniform pollution source, the conditions of the hypothesis are preliminarily explored. The research indicates that VIT can be regarded as a continuous turbulence source when vehicles maintain a “safe distance” on the road and form a stable traffic flow. Moreover, according to the range of dispersion of exhaust pollution, a “healthy distance” was proposed to guide driver to avoid direct impact of exhaust emitted from the vehicles in front.",

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note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Building and Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Building and Environment, 181 (2017) DOI: 10.1016/j.buildenv.2020.107120 {\textcopyright} 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

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N2 - Moving vehicles are the primary emission source of road pollution and the vehicle-induced turbulence (VIT) affecting the flow field in the street canyon. This paper used the dynamic mesh updating method to simulate the air pollution under the real situation of vehicle movement and exhaust emission in the street canyon. The dispersion characteristics of vehicular exhaust under various vehicle arrangements were analyzed. The personal intake fraction (P_IF) was introduced as an index to analyze the impact of factors such as vehicle speed and ambient wind velocity on the pollution exposure level of pedestrians. Based on the general assumptions in the study of street canyon pollution that vehicle-induced turbulence (VIT) is a continuous turbulence source and vehicle exhaust pollutants is a uniform pollution source, the conditions of the hypothesis are preliminarily explored. The research indicates that VIT can be regarded as a continuous turbulence source when vehicles maintain a “safe distance” on the road and form a stable traffic flow. Moreover, according to the range of dispersion of exhaust pollution, a “healthy distance” was proposed to guide driver to avoid direct impact of exhaust emitted from the vehicles in front.

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The effect of exhaust emissions from a group of moving vehicles on pollutant dispersion in the street canyons

Abstract

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