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

机译：一组移动车辆对街道峡谷污染物分散的影响

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摘要

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.
机译：移动的车辆是道路污染的主要排放来源和影响街道峡谷中流场的车辆诱导的湍流（VIV）。本文采用动态网格更新方法来模拟车辆运动和街道峡谷排气的真实情况下的空气污染。分析了各种车辆布置下车辆排气的分散特性。将个人进气级分（P_IF）作为分析行人污染暴露水平的因素，以分析因素的影响，例如车辆速度和环境风速等因素。基于街道峡谷污染研究的一般假设，车辆诱导的湍流（VIT）是连续的湍流源和车辆粪便污染物是均匀的污染源，假设的条件是初步探索的。该研究表明，当车辆在道路上保持“安全距离”并形成稳定的交通流量时，VIT可以被视为连续的湍流源。此外，根据排气污染的分散范围，提出了一种“健康距离”以引导驾驶员，以避免在前面的车辆中发出的排气的直接冲击。

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