GDI发动机燃用甲醇及甲醇/汽油混合燃料的微粒排放特性研究  

Investigation on Particulate Matter Emission of GDI Engine Fueled with Methanol and Gasoline- Methanol Blends

作　　者：李翔[1] 裴毅强[1] 秦静[1,2] 安彦召[1] 张建业[1] 李云龙[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]天津大学内燃机研究所,天津300072

出　　处：《内燃机工程》2015年第2期1-6,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(50806051;50976076)

摘　　要：在缸内直喷汽油机上进行了燃用纯甲醇和甲醇/汽油混合燃料的微粒排放特性研究,分析了点火定时、喷油定时和过量空气系数对微粒排放的影响规律。试验结果表明:在选定的发动机典型常用运行工况下,燃用纯甲醇燃料(M100)时,缸内直喷汽油机几乎不产生微粒排放;燃用甲醇/汽油混合燃料时(M20或M25),排气微粒数浓度主要集中在核态微粒区域,微粒质量浓度主要集中在积聚态微粒区域,其中M25燃料的微粒排放性要优于M20燃料;随着点火定时的提前,排气微粒数浓度和质量浓度均有所升高;随着喷油定时的提前,排气微粒数浓度降低,微粒质量浓度升高。Effects of ignition timing, injection timing and excess air ratio ,t on particulate matter （PM） emission from a gasoline direct injection （GDI） engine fueled with pure methanol and gasoline-methanol blends was investigated experimentally. Results show that there is almost no PM emission when fueled with pure methanol; for gasoline-methanol blends M25 and M20, particulate number concentration mainly concentrates in the nucleation mode zone, and particulate mass concentration mainly concentrates accumulation mode zone. PM emission for M25 is generally lower than M20. As spark timing advance, PM number concentration and mass concentration increase, and as injection timing advance, PM number concentration decreases and PM mass concentration increases.

关 键 词：内燃机 缸内直喷汽油机 甲醇 甲醇/汽油混合燃料 微粒排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]