Chemiion evolution in motor vehicle exhaust: Further evidence of its role in nanoparticle formation
Chemiion evolution in motor vehicle exhaust: Further evidence of its role in nanoparticle formation
复制标题
机动车尾气中化学离子的演变：其在纳米颗粒形成中作用的进一步证据
DOI：
10.1029/2002gl015004
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发表时间：
2002
影响因子：
5.2
通讯作者：
F. Yu
中科院分区：
文献类型：
--
作者：
F. Yu
研究了发动机产生的化学物质在汽车排气管或采样传输线中的演变，并对控制出口平面化学物质浓度的关键参数进行了研究。我们发现，随着交通速度的增加，核模粒子的数量浓度增加而尺寸减小，与传输线停留时间的缩短有关，纳米粒子发射增强与碳烟排放减少有关，以及核模粒子的数量浓度增加而尺寸减小与交通速度的增加有关，都可以一致地解释为传输线或排气管中离子损失的减少。这进一步证明，发动机产生的化学物质在机动车尾气中纳米颗粒的形成中起着关键作用。
The evolution of engine‐generated chemiions in a vehicle tailpipe or in a sampling transfer line is studied and the key parameters controlling chemiion concentration at the exit plane are investigated. We find that the observed higher number concentration but smaller size of nuclei mode particles associated with shorter transfer line residence time, enhanced nanoparticle emission associated with reduced soot emission, and increase in the number concentration but decrease in the size of nuclei mode particles associated with increasing traffic speed, can all be consistently explained by the reduced loss of ions in the transfer line or tailpipe. This provides further evidence that engine‐generated chemiions play a key role in the formation of the nanoparticles in motor vehicle exhaust.