Characteristics of Soot Formation in Optical Engine
using Methanol-HCB under PPC Low-Temperature Combustion
Mode

doi:10.3969/j.issn.1001-2222.2025.02.002

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (2) : 9. DOI: 10.3969/j.issn.1001-2222.2025.02.002

Characteristics of Soot Formation in Optical Engine using Methanol-HCB under PPC Low-Temperature Combustion Mode

SHAO Zhuang^1,2,LI Weimin²,CHEN Ji²,ZHAO Xinqiang³,ZHOU Xiucheng³,MA Xiaohan²

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Abstract

Combustion characteristics and transient soot generation of methanol-hydrogenated catalytic biodiesel(HCB) in partially premixed combustion(PPC) low temperature combustion mode were investigated by using an optical engine and twocolor testing method. The results indicate that the peak cylinder pressures of M0(100% HCB) and M15(15% methanol, 25% n-octanol, and 60% HCB) increase first and then decrease as the timing of direct injection advances. The methanol blending reduces the activity of blended fuels, which results in the lagging of the combustion phases of M15 compared with that of M0 under the same direct injection moment. In the early stage of PPC combustion mode, the flame temperature of M15 is lower than that of M0 due to the heat absorption of methanol evaporation, but with the development of combustion, the full combustion of M15 not only makes its flame temperature gradually higher than that of M0, but also significantly reduces the generation of carbon soot in the late combustion phase due to the higher oxygen content of M15 and the more homogeneous distribution of the fuel.

Key words

optical engine / two-color method / HCB / methanol / flame temperature / soot / low-temperature combustion

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SHAO Zhuang, LI Weimin, CHEN Ji, ZHAO Xinqiang, ZHOU Xiucheng, MA Xiaohan. Characteristics of Soot Formation in Optical Engine using Methanol-HCB under PPC Low-Temperature Combustion Mode[J]. Vehicle Engine. 2025, 0(2): 9 https://doi.org/10.3969/j.issn.1001-2222.2025.02.002