Lu Ye-qiang, Chen Qiu-fang, Sun Zai, Cai Zhi-liang, Yang Wen-jun
Huan Jing Ke Xue. 2014 Sep;35(9):3309-14.
Ultrafine particle (UFP) number concentrations obtained from three different vehicles were measured using fast mobility particle sizer (FMPS) and automobile exhaust gas analyzer. UFP number concentration and size distribution were studied at different idle driving speeds. The results showed that at a low idle speed of 800 rmin-1 , the emission particle number concentration was the lowest and showed a increasing trend with the increase of idle speed. The majority of exhaust particles were in Nuclear mode and Aitken mode. The peak sizes were dominated by 10 nm and 50 nm. Particle number concentration showed a significantly sharp increase during the vehicle acceleration process, and was then kept stable when the speed was stable. In the range of 0. 4 m axial distance from the end of the exhaust pipe, the particle number concentration decayed rapidly after dilution, but it was not obvious in the range of 0. 4-1 m. The number concentration was larger than the background concentration. Concentration of exhaust emissions such as CO, HC and NO showed a reducing trend with the increase of idle speed,which was in contrast to the emission trend of particle number concentration.
使用快速移动粒子粒度分析仪（FMPS）和汽车尾气分析仪测量了来自三种不同车辆的超细颗粒（UFP）数量浓度。研究了不同怠速行驶速度下的UFP数量浓度和粒径分布。结果表明，在800 rmin-1的低怠速速度下，排放颗粒数量浓度最低，并随着怠速速度的增加呈上升趋势。大多数排气颗粒处于核模态和艾肯模态。峰值粒径以10 nm和50 nm为主。在车辆加速过程中，颗粒数量浓度显著急剧增加，然后在速度稳定时保持稳定。在距排气管末端0.4 m的轴向距离范围内，稀释后颗粒数量浓度迅速衰减，但在0.4 - 1 m范围内不明显。数量浓度大于背景浓度。CO、HC和NO等尾气排放浓度随着怠速速度的增加呈下降趋势，这与颗粒数量浓度的排放趋势相反。
