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首页> 外文期刊>International journal of nonlinear sciences and numerical simulation >Numerical Simulation of the Formation of Pollutant Nanoparticles in the Exhaust Twin-jet Plume of a Moving Car
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Numerical Simulation of the Formation of Pollutant Nanoparticles in the Exhaust Twin-jet Plume of a Moving Car

机译：动车排气双喷羽流中污染物纳米颗粒形成的数值模拟

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The concentration and size of particulate matter (PM) in atmosphere have a severe impact on human health. Diesel vehicle engines generate great abundant nanoparticles. The large eddy simulation (LES) was combined with the equations of nucleation and coagulation to study the flow structure and the formation of pollutant nanoparticles H{sub}2SO{sub}4 droplets in the flow around an on-road two tailpipes sedan. The effects of different ambient wind speeds and exhaust gas speeds on the particle number concentration and size distributions have been studied. The results show that the ratio of the ambient wind velocity to exhaust gas velocity greatly affect the flow structure, and further affect the nanoparticle concentration and size distribution. A higher ambient wind speed reduces the formation rate of nanoparticles and increases nanoparticle size. This study contributes to a better understanding of the number concentration and size distribution of nanoparticles which form through a nucleation process and transform as the subsequent coagulation after the formation.
机译：大气中颗粒物（PM）的浓度和大小会对人体健康造成严重影响。柴油发动机产生大量的纳米颗粒。将大型涡模拟（LES）与成核和凝聚方程相结合，以研究公路两个排气管轿车周围流中的污染物纳米颗粒H {sub} 2SO {sub} 4液滴的流动结构和形成。研究了不同的环境风速和排气速度对颗粒数浓度和粒径分布的影响。结果表明，环境风速与废气速度的比值极大地影响了流动结构，进一步影响了纳米粒子的浓度和粒径分布。较高的环境风速降低了纳米颗粒的形成速率并增加了纳米颗粒的尺寸。这项研究有助于更好地理解通过成核过程形成的纳米颗粒的数量浓度和尺寸分布，并随着形成后的后续凝结而转变。

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