A quantitative description of vehicle exhaust particle size distributions in a highway tunnel
A quantitative description of vehicle exhaust particle size distributions in a highway tunnel
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DOI：
10.1080/10473289.2004.10470905
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发表时间：
2004-03-01
影响因子：
2.7
通讯作者：
Gertler, AW
中科院分区：
文献类型：
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作者：
Abu-Allaban, M;Rogers, CF;Gertler, AW
在1999年5月18日至5月22日期间，在宾夕法尼亚州收费公路的Tuscarora山隧道进行了一项全面的研究，以测量真实世界的机动车排放。作为本研究的一部分，使用扫描迁移率粒度仪确定了颗粒排放的尺寸分布。每一次测量的尺寸分布都包括两种模式：中点直径小于20 nm的成核模式和中点直径小于100 nm的堆积模式。在某些分布中，成核分量和堆积分量也出现了第二次极大值，这表明这些粒径分布是两个粒径分布的叠加。该假设用于拟合具有四个对数正态分布的第二个最大值的粒径分布，其中两个用于成核模式，两个用于堆积模式。拟合假设观测到的粒径分布是两个双峰对数正态分布的组合，一个归因于重型柴油（HDD）车辆，另一个归因于不同类别的HDD车辆或轻型火花点火车辆。基于该方法，估计轻型火花点火和HDD车辆的颗粒产生率分别为1.8 x 10（13）和2.8 x 10（14）个颗粒/车-公里，这与独立获得的估计值一致。
During the period May 18-May 22, 1999, a comprehensive study was conducted in the Tuscarora Mountain Tunnel on the Pennsylvania Turnpike to measure real-world motor-vehicle emissions. As part of this study, size distributions of particle emissions were determined using a scanning mobility particle sizer. Each measured size distribution consisted of two modes: a nucleation mode with midpoint diameter less than 20 nm and an accumulation mode with midpoint diameter less than 100 nm. The nucleation and accumulation components in some distributions also exhibited second maxima, which implies that such particle size distributions are superpositions of two particle size distributions. This hypothesis was utilized in fitting the particle size distributions that exhibited second maxima with four lognormal distributions, two for the nucleation mode and two for the accumulation mode. The fitting assumed that the observed particle size distribution was a combination of two bimodal lognormal distributions, one attributed to the heavy-duty diesel (HDD) vehicles and another attributed either to a different class of HDD vehicles or to the light-duty spark ignition vehicles. Based on this method, estimated particle production rates were 1.8 x 10(13) and 2.8 x 10(14) particles/vehicle-km for light-duty spark ignition and HDD vehicles, respectively, which agreed with independently obtained estimates.