论文部分内容阅读
测量了轻型柴油车在高怠速和低怠速运转的条件下,其尾气烟羽中粒径范围在15 nm到30μm的颗粒数量和粒径的分布。利用SMPS和APS测量装置测量尾气烟羽中心线和环境背景条件下的颗粒排放。测量结果表明,测试的柴油车在高怠速运转的条件下会排放出更多的颗粒。然而,在两种怠速条件下,总的颗粒数量浓度由于沉降的作用会随着远离排气管的距离而减少。测量结果还表明,柴油车排放的颗粒主要是粒径小于700 nm的颗粒,这些细颗粒比粗颗粒更易长期悬浮于大气中,从而引发局部的颗粒物污染问题。
The distribution of particle number and particle size in the range of particle diameter from 15 nm to 30 μm in tail plume was measured under light and low idling conditions. Particle emission measured by SMPS and APS measuring devices on the center line of tail plume and environmental background. The measurement results show that the diesel vehicles tested emit more particles under high idling conditions. However, under both idling conditions, the total particle concentration decreases due to settling away from the exhaust pipe. The measurement results also show that the particles emitted by diesel vehicles are mainly particles with a diameter of less than 700 nm. These fine particles are more likely to be suspended in the atmosphere than coarse particles for a long period of time, thereby causing local particle pollution problems.