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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation
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Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation

机译：用CFD模拟和风洞验证对城市街道上的单个巡航车辆的排放流模型进行建模

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摘要

Transportation has become one of the primary sources of urban atmospheric pollutants and it causes severe diseases among city residents. This study focuses on assessing the pollutant dispersion pattern using computational fluid dynamics (CFD) numerical simulation, with the effect and results validated by the results from wind tunnel experiments. First, the wind tunnel experiment was carefully designed to preliminarily assess the flow pattern of vehicle emissions. Next, the spatiotemporal distribution of pollutant concentrations around the motor vehicle was modeled using a CFD numerical simulation. The pollutant concentration contours indicated that the diffusion process of carbon monoxide mainly occurred in the range of 0−2 m above the ground. Meanwhile, to verify the correctness of the CFD simulation, pressure distributions of seven selected points that were perpendicular along the midline of the vehicle surface were obtained from both the wind tunnel experiment and the CFD numerical simulation. The Pearson correlation coefficient between the numerical simulation and the wind tunnel measurement was 0.98, indicating a strong positive correlation. Therefore, the distribution trend of all pressure coefficients in the numerical simulation was considered to be consistent with those from the measurements. The findings of this study could shed light on the concentration distribution of platoon-based vehicles and the future application of CFD simulations to estimate the concentration of pollutants along urban street canyons.
机译：交通运输已成为城市大气污染物的主要来源之一，并在城市居民中引起严重疾病。这项研究的重点是使用计算流体动力学（CFD）数值模拟评估污染物的扩散模式，其效果和结果已通过风洞实验的结果得到验证。首先，精心设计了风洞实验，以初步评估车辆排放物的流态。接下来，使用CFD数值模拟对机动车周围污染物浓度的时空分布进行建模。污染物浓度等值线表明，一氧化碳的扩散过程主要发生在离地面0-2 m的范围内。同时，为验证CFD仿真的正确性，通过风洞实验和CFD数值仿真获得了沿车辆表面中线垂直的七个选定点的压力分布。数值模拟与风洞测量之间的皮尔逊相关系数为0.98，表明存在强正相关。因此，数值模拟中所有压力系数的分布趋势被认为与测量结果一致。这项研究的结果可能有助于阐明基于排的车辆的浓度分布以及未来的CFD模拟在估算城市街道峡谷中污染物浓度方面的应用。

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