T型街谷交叉路口机动车诱导下污染物传播规律

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Abstract In order to explore the influence of the moving vehicle on the air flow and pollutant dispersion at the T-shaped street intersection, a mathematical model coupling the fluid and pollutant concentration fields with the moving vehicle is established. The characteristics of the traffic-induced turbulence and pollutant diffusion in the T-shaped street intersection are revealed using the method of computational fluid dynamics. Based on filed synergy theory, the impact of the vehicle moving speed on pollutant dispersion is quantitatively evaluated. The results show that the turbulent kinetic energy induced by the moving vehicle increases with the increase of the vehicle speed. When the vehicle speed is 9m/s, the maximum turbulent kinetic energy on the central axis of the vehicle is 5times higher than that when the vehicle speed is 3m/s. However, the affected region of the turbulent kinetic energy in the rear of the vehicle is about 4m for all the cases. When the vehicle speed increases from 3m/s to 9m/s, the field synergy increases by 66%, and the average concentration of pollutants in the pedestrian area decreases by 43% With the increase of vehicle moving speed, the flow field at T-shaped street intersection is changed, and the synergistic effect between the velocity field and the pollutant concentration field is enhanced, which in turn reduces the pollutant concentration by improving the convective mass transfer effect in the pedestrian region.

Key words： T-shaped intersection vehicle turning numerical simulation pollutant dispersion field synergy theory

Received: 13 September 2021

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X511

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	SU Chang-rong
	MING Ting-zhen
	WU Yong-jia
	SHI Tian-hao
	HE Fang-yan

Cite this article:

SU Chang-rong,MING Ting-zhen,WU Yong-jia等. Numerical simulation of pollutant dispersion induced by vehicle moving in a T-shaped intersection[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1534-1544.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1534

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