摘要
对一台车用高压共轨直喷式柴油机,分别燃用纯柴油和B20燃料,在未加装后处理装置的原机和加装柴油机氧化催化器与颗粒氧化催化转化器(DOC+POC)后处理装置的两种状态下,利用EEPS颗粒粒径谱仪,测试其排气颗粒数量排放及其粒径分布。结果表明:未加装后处理装置时,燃用B20燃料的核态颗粒数量排放略高于柴油;而聚集态颗粒的数量排放则低于柴油;加装DOC+POC后处理装置后,排气颗粒数量排放明显下降,颗粒净化效率存在两个较高的峰值,一个在粒径10nm附近的核态颗粒区域,另一个在粒径300nm附近的聚集态颗粒区域。燃用B20燃料时,总的来说排气颗粒数量排放低于柴油,一DOC+POC对多数工况下颗粒的净化效率明显高于柴油。
The exhaust particle number emission and its size distribution of a high-pressure common rail di- rect injection automotive diesel engine fueled with pure diesel and biodiesel B20, with and without diesel oxidation catalyst and particle oxidation catalyst （DOC＋POC） are measured respectively by using EEPS spectrometer. The re- suits show that the number emission of nucleation mode particles of original engine fueled with B20 is higher than that with pure diesel, while the situation for accumulation mode particles is just the opposite. With DOC＋POC add- ed, exhaust particle number emission obviously reduces and there are two peaks for particle purification efficiency （at around the particle size of 10nm and 300nm respectively）, and by and large, the particle number emission for B20 is lower than that for diesel and the particle purification efficiency for B20 is higher than that for diesel in most working conditions.
出处
《汽车工程》
EI
CSCD
北大核心
2015年第7期737-742,共6页
Automotive Engineering
基金
国家自然科学基金(50906062)
国家863计划项目(2012AA111717)资助
