不同稀释条件与测量技术下缸内直喷汽车排放颗粒物数浓度和粒径分布特征

发布时间：2018-06-21 20:36

本文选题：缸内直喷 + 颗粒物　；参考：《中国电机工程学报》2016年16期

【摘要】：利用2套稀释采样系统和3套测试系统对GDI汽油车排放颗粒物的数浓度和粒径分布特征进行了测试,比较了不同稀释方式与测量技术下排放颗粒物的差异,并探究了不同稀释流量对颗粒物测量结果的影响。结果表明,GDI汽油车在使用满足国V标准的汽油时,其排放颗粒物呈现核模态和积聚模态双峰分布,峰值粒径分别出现在22 nm和83 nm,而积聚模态颗粒物居多。全流定容稀释系统(CVS)下在一定范围内改变稀释流量对颗粒物粒径分布影响较小,数浓度测量结果相差±11%。法规规定的测试系统(PMP法)数浓度测量结果可重复性好,ELPI+测试结果要高于PMP法,2种方法的测量结果相差23%~100%,在速率变化较大的工况下相差更大。法规规定的CVS稀释系统测量的数浓度结果低于直采稀释系统的测量结果。
[Abstract]:Two dilution sampling systems and three test systems were used to measure the number concentration and particle size distribution of particulates emitted from GDI gasoline vehicles, and the differences between different dilution methods and measurement techniques were compared. The effects of different dilution flow rates on the measurement results of particulate matter were investigated. The results showed that the emission particles of GDI gasoline vehicle showed double peak distribution of nuclear mode and accumulation mode when using gasoline that met the national V standard. The peak particle size appeared at 22 nm and 83 nm, respectively, while the accumulation mode of particulate matter was the most. In the whole flow constant volume dilution system (CVS), changing the dilution flow rate in a certain range has little effect on the particle size distribution, and the difference between the measured results of the number concentration and the particle size distribution is 卤11. The number concentration measurement results of PMP method are more reproducible than those of PMP method and ELPI method. The difference between the two methods is 23 / 100, and the difference is even greater when the rate varies greatly. The number concentration measured by CVS dilution system is lower than that measured by direct mining dilution system.
【作者单位】：清华大学环境学院;
【基金】：国家重点基础研究发展计划项目(973计划)(2013CB 228505) 国家自然科学基金项目(91544222)~~
【分类号】：X734.2

【相似文献】