柴油微引燃乙醇发动机燃烧、性能及排放特性研究

陈桢皓1; 李铁1; 2; 王斌1; 2; GAO Tongyang3; ZHENG Ming3

doi:10.3969/j.issn.1001-2222.2017.06.002

车用发动机 ›› 2017, Vol. 0 ›› Issue (6) : 7-12. DOI: 10.3969/j.issn.1001-2222.2017.06.002

栏目

柴油微引燃乙醇发动机燃烧、性能及排放特性研究

陈桢皓¹，李铁^1,2，王斌^1,2，GAO Tongyang³,ZHENG Ming³

作者信息 +

Combustion, Performance and Emission Characteristics of Ethanolfueled Engine with Diesel Micropilot Injection Ignition

CHEN Zhenhao¹,LI Tie^1,2,WANG Bin^1,2,GAO Tongyang³,ZHENG Ming³

Author information +

文章历史 +

摘要

柴油微引燃乙醇发动机采用进气道喷射乙醇、缸内直喷微量柴油引燃的方式进行燃料供给。基于单缸四冲程柴油机，对其燃烧、性能及排放特性进行研究，固定引燃柴油喷射量为发动机能实现压燃着火的最小值，在进气压力为0.15 MPa时比较不同乙醇喷射量的工况组，通过改变柴油喷射时刻进行工况扫描。结果表明，引燃柴油的喷射时刻对发动机的燃烧、性能和排放影响显著。柴油微引燃乙醇发动机在中高负荷能够稳定运行，指示热效率可达34%以上，通过适当调节柴油喷射时刻，可以有效控制未燃碳氢（UHC）、NOx与CO排放，同时可以实现极低的炭烟排放。柴油微引燃乙醇发动机燃烧模式为预混合或部分预混合燃烧，燃烧有两阶段放热特征，改变引燃柴油喷射时刻，可以有效控制燃烧相位。

Abstract

Ethanolfueled engine with diesel micro-pilot injection ignition adopted the fuel supply method of ethanol port injection and diesel in-cylinder direct injection. On a singlecylinder fourstroke compression ignition engine, the combustion, performance and emission characteristics were researched. With the pilot diesel amount fixed as the minimum value to realize compressionignition, pilot diesel injection timing sweeping tests were conducted based on different ethanol injection mass under intake air pressure of 0.15 MPa. Pilot diesel injection timing had a strong effect on combustion, performance and emission. The engine could work steadily at medium and high load and its thermal efficiency was more than 33%. With the appropriate pilot diesel injection timing, unburnt hydrocarbon, carbon monoxide and nitrogen oxide emission decreased and the ultralow soot emission realized. In addition, engine combustion form of premixed combustion or partialpremixed combustion led to 2-stage heat release characteristic and so combustion phase could be controlled effectively by changing pilot diesel injection timing.