期刊
FUEL
卷 317, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.123414
关键词
Diesel-methanol diffusion combustion; Dual-direct injection system; Methanol substitution ratio; Combustion and emissions; Energy distribution
资金
- National Science Foun-dation of China [51779044]
This study investigates the effects of high methanol substitution ratio (MSR) on the combustion performance of diesel-methanol diffusion combustion (DMDC) mode. The results show that DMDC mode can significantly reduce NOx and soot emissions, and improve indicated thermal efficiency (ITE) at high engine loads.
To investigate the high methanol substitution ratio (MSR) combustion performance of diesel-methanol diffusion combustion (DMDC) mode, the engine experiments were conducted based on a high-speed light-duty engine with a dual-direct injection system in this study. Effects of MSR on the combustion, emission and energy distribution characteristics, as well as the difference between the DMDC mode and the conventional diesel combustion (CDC) mode, were investigated in detail under four engine loads at a constant engine speed of 3000 rpm and a similar CA50 of 7.5 degrees CA ATDC. The experimental results show that the MSR can reach 87% at BMEP = 0.55 MPa. Under all operating conditions, the NOx and soot emissions of the DMDC mode are significantly reduced simultaneously compared to those of the CDC mode, and the reduction is enlarged as both MSR and loads increase. At BMEP = 0.14 MPa, the indicated thermal efficiency (ITE), THC and CO emissions of the DMDC mode are inferior to that of the CDC mode. However, the combustion and emission performances are gradually improved when the BMEP exceeds 0.27 MPa. Especially at BMEP = 0.55 MPa, the THC and CO emissions of the DMDC mode are lower and the ITE increases by 10% compared to the CDC mode, and the ITE is more sensitive to the MSR. According to the energy distribution analysis, it can be found that the heat transfer loss and exhaust loss of the DMDC mode have been dramatically reduced, resulting in the increased ITE compared to the CDC mode.
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