不同燃烧模式下正庚烷燃烧发动机排气超细颗粒特性  

Effects of Combustion Modes on Exhaust Particle Size Distributions from a Diesel Engine Fueled with n-Heptane

作　　者：刘炜[1,2] 黄震[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]深圳创新集团投资有限公司博士后工作站,广东深圳518048

出　　处：《上海交通大学学报》2011年第6期837-841,共5页Journal of Shanghai Jiaotong University

基　　金：教育部高校博士点基金项目(20070248024)

摘　　要：在改造的发动机上研究了正庚烷缸内直喷压燃(CIDI)、进气道喷射均质压燃(HCCI)以及进气道-气缸喷射复合燃烧(CCCI)3种燃烧模式的发动机排气超细颗粒特性.结果表明,排气超细颗粒数浓度-粒径分布曲线随预混合率变化显著;CIDI燃烧时,排气超细颗粒以积聚模态微粒为主.随着预混合率的增大,排气积聚模态微粒数浓度明显降低,而核模态数浓度则显著增大;正庚烷HCCI燃烧时发动机排气超细颗粒以核模态微粒为主,积聚模态微粒数浓度很低;正庚烷CCCI和HCCI燃烧时发动机排气总颗粒数浓度明显较CIDI燃烧时高.排气核模态数浓度与HC排放明显相关.Effect of combustion modes（including compression ignition direct injection（CIDI）,homogeneous charge compression ignition（HCCI） and compound charge compression ignition（CCCI） combustion） on NSDs of exhaust particles from engines fuelled with n-heptane was studied.The results indicate that the structure of NSDs for n-heptane changes with premixed ratio（rp） obviously.The accumulation mode dominates in CIDI case.With the increase of rp,the accumulation mode decreases,the nucleation mode increases significantly.In HCCI case,the nucleation mode occupies the dominant part of the total particles,and the number concentration of accumulation mode is very low.And the total exhaust particles number concentrations for CCCI and HCCI are obviously higher than those of CIDI.In addition,the number concentration of nucleation mode is highly correlation with HC concentrations.

关 键 词：燃烧模式 排气 超细颗粒 正庚烷 

分 类 号：TK16[动力工程及工程热物理—热能工程]