To investigate the influence of methanol on exhaust
particulates of diesel engines, a port
methanol injection system was installed on a four-cylinder
turbocharged intercooled common rail diesel engine. The particulate matter
emissions were measured at 2 400 r/min and 100% load, and the effects of
methanol introduction into the intake port on combustible mixture formation in
the cylinders and the microstructure of particulate matter from F-T diesel were analyzed. A computational model of the diesel
combustion process under a methanol atmosphere was developed to examine the
impact of in-cylinder methanol atmosphere on soot
precursor formation. The results show that the presence of methanol in the
cylinder significantly improves the oxidation degree and microstructure of soot
particles. At a methanol concentration of 30%, the average interlayer spacing
of the particles increases by 13.2%, the microcrystalline length shortens by
29.6%, and the curvature increases by 28.9%. With the increase of methanol
concentration, the peak concentrations of all PAHs decrease significantly, and
their peak occurrence times generally advance. Methanol exerts a more
pronounced inhibitory effect on high ring number PAHs and significantly reduces the soot concentration at M30.
LYU Hui, LI Ruina, YANG Dahai
. Influence of Methanol Atmosphere in Diesel Engine Cylinder
on Particle Structure of F-T Diesel[J]. Vehicle Engine, 2025
, 0(6)
: 17
-21
.
DOI: 10.3969/j.issn.1001-2222.2025.06.003
