孟相宇

个人信息Personal Information

副教授

博士生导师

硕士生导师

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:化工学院

学科:安全科学与工程. 化工过程机械

电子邮箱:mengxiangyu@dlut.edu.cn

扫描关注

论文成果

当前位置: 中文主页 >> 科学研究 >> 论文成果

Combustion characteristics of high pressure direct-injected methanol ignited by diesel in a constant volume combustion chamber

点击次数:

论文类型:期刊论文

发表时间:2019-10-15

发表刊物:FUEL

收录刊物:SCIE、EI

卷号:254

ISSN号:0016-2361

关键字:Methanol-diesel dual-fuel; Flame development; Flame lift-off length; Shadowgraph imaging; Natural luminescence imaging

摘要:To figure out the interaction between direct-injected methanol and diesel during the whole combustion process, this paper studied the direct-injected methanol ignited by diesel through shadowgraph and natural luminescence imaging in a constant volume combustion chamber which allows both fuels directly injected with high pressure. Strategies of diesel injection with pilot methanol (DIPM) and conventional diesel injection (CDI) were included. Results show that in DIPM cases, there were areas where the methanol failed to achieve a complete burning at the end of combustion. These areas may explain the excessive emission of HC in the relevant engine tests. Besides, DIPM ignition delay firstly drops from 1.183 to 1.125 ms as the diesel injection pressure rising from 60 to 120 MPa and then increases to 1.237 ms when diesel pressure is 140 MPa. While ignition delay in CDI cases keeps decreasing with the increase of diesel pressure. It indicates that inhibition effect of methanol injection was not obvious in DIPM at low pressure injected diesel condition due to a poor methanol-diesel mixing but took dominance when diesel injection pressure was high. The inhibition of methanol also led to the result that ignition spot of DIPM was 8.9-17.6% closer to diesel injector nozzle than that of CDI with the increase of diesel pressure. Finally, the SINL of DIPM drops more quickly than CDI. It implies a faster and more complete soot oxidation in DIPM cases caused by the later combustion of methanol.