中文摘要：

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。

英文摘要：

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.