Influence of Methanol Atmosphere in Diesel Engine&nbsp;Cylinder
on Particle Structure of F-T Diesel

doi:10.3969/j.issn.1001-2222.2025.06.003

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (6) : 17-21. DOI: 10.3969/j.issn.1001-2222.2025.06.003

Influence of Methanol Atmosphere in Diesel Engine Cylinder on Particle Structure of F-T Diesel

LYU Hui,LI Ruina,YANG Dahai

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Abstract

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.

Key words

F-T diesel / methanol / particulate matter / polycyclic aromatic hydrocarbons / particle structure characterization

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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 https://doi.org/10.3969/j.issn.1001-2222.2025.06.003