柴油机缸内微粒粒数粒径分布规律的研究  

Investigation on the Numbers and Size Distributions of In-Cylinder Particulates for a Diesel Engine

作　　者：董素荣[1] 宋崇林[1] 张国彬[2] 裴毅强[1] 张铁臣[1] 张宾[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]军事交通学院汽车工程系,天津300161

出　　处：《内燃机学报》2008年第1期24-28,共5页Transactions of Csice

基　　金：国家重点基础研究发展规划资助项目(2002CB21603);国家自然科学基金资助项目(50576067)

摘　　要：基于柴油机全气缸取样系统，采用商用电子低压冲击仪（ELPI）和透射电子显微镜（TEM），对柴油机燃烧过程中凝聚微粒的粒数浓度、粒径分布和基本碳粒子的粒径分布进行了研究。研究结果表明，凝聚微粒粒数浓度随曲轴转角呈单峰状分布，峰值出现在上止点后14～18°CA，燃烧后期约70％以上的微粒粒数被氧化燃烧；凝聚微粒粒数、粒径呈类似对数正态分布，频度最大值出现在100～200nm。构成凝聚微粒的基本碳粒子粒径呈高斯分布，最大值出现在15～30nm，平均粒径为19．7～29．7nm，且在上止点后12～15°CA出现最大值。Using the total cylinder sampling system of diesel engine, the number concentration and size distribution of in-cylinder particulates were investigated by the electrical low pressure impactor（ELPI） and the sized distribution of primary carbon particle was studied by a field emission gun transmission electron microscopy （ FEG TEM）. Experimental results indicate that the agglomeration number concentration gives the unimodal distribution versus the crank angle, and the peak value occurs at 14 - 18° CA ATDC. Over 70% agglomeration is oxidized in the late combustion phase. The distribution of particulate number size is analogous to lognormal distribution, and the maximum frequencies is occurred at 100 - 200 nm diameter. The size distribution of primary carbon particles gives the gauss distribution and the maximum value is occurred at 15 - 30 nm particle diameter. The average diameter is in the range of 19.7 -29.7 nm,and the peak value is presented at 12 - 15°CA ATDC.

关 键 词：柴油机 全气缸取样系统 缸内微粒 粒数浓度 粒径分布 基本碳粒子 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]