DME CCCI COMBUSTION IN A DIESEL Engine

摘要：

Taking advantage of Homogeneous Charge Compression Ignition (HCCI) combustion and in-cylinderdirect injection combustion for an engine fueled with dimethyl ether(DME)，a new concept combustionsystem，namely Compound Charge Compression Ignition(CCCI) combustion system by port aspiration anddirect injection of DME，is proposed．A diesel engine was modified to realize this combustion mode．Combustion and emissions characteristics were investigated under different premixed fuel ratios and fueldelivery advance angles．The experimental results show that CCCI combustion process comprises HCCIcombustion,pre-mixing combustion and diffusion combustion．The combustion characteristics mainlydepend on premixed fuel ratio．With the increase of premixed fuel ratio，at 0.12MPa brake mean effectivepressure(BMEP)，the combustion varies from two stages to three stages，to four stages，later to three stagesand finally to two stages again．The peak of in-cylinder temperature and pressure decrease firstly andincrease later，while NOx emissions decrease monotonously．At 0.24 MPa BMEP，the peak of temperature，pressure，pressure rise rate and pressure rise acceleration as well as NOx emissions decrease firstly andincrease later．At 0.36 MPa BMEP，the peak Of temperature，pressure and N0x emissions increasemonotonously in the available range Of the premixed fuel ratio．As fuel delivery is advanced．CO and HCemissions decrease but N0x emissions increase；and the fuel consumption is lowered．Compared with HCCIcombustion mode，with a certain premixed fuel ratio and fuel delivery advance angle，CCCI combustion canextend the engine operating range with little change in N0x emissions and a considerable reduction in HCand CO emissions．

关键词： Dimethyl ether CCCI combustion HCCI Premixed fuel ratio Combustion control

作者: Xinqi.Qiao Junjun.Zhang Zhen.Wang Bin.Guan Zhen.Huang

作者单位: Key Laboratory of Power Machinery and Engineering,Ministry of Education.,Shanghai Jiao Tong Univ.,Shanghai 200240,China

会议类型: 国际会议

会议名称: 3rd International DME Conference & 5th Asian DME Conference(第三届国际二甲醚会议暨第五届亚洲二甲醚会议)

会议地点: 上海

会议语种:英文

页码: 1-7

在线出版日期: 2008-09-21（万方平台首次上网日期，不代表论文的发表时间）