Analysis of Unregulated Emission for High-Compression Ratio Methanol Engine

ZHEN Xudong; LEI Xingxing; TIAN Zhi; GENG Jie; LI Runing; LI Xiaoyan

doi:10.3969/j.issn.1001-2222.2023.03.009

Vehicle Engine ›› 2023, Vol. 0 ›› Issue (3) : 52-58. DOI: 10.3969/j.issn.1001-2222.2023.03.009

Analysis of Unregulated Emission for High-Compression Ratio Methanol Engine

ZHEN Xudong¹,LEI Xingxing¹,TIAN Zhi²,GENG Jie¹,LI Runing¹,LI Xiaoyan³

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Abstract

By coupling the detailed chemical kinetic mechanism of methanol oxidation with onedimensional GTPower and threedimensional CFD simulation software, a onedimensional and threedimensional physical model of spark ignition methanol engine was established to study the unregulated emissions based on the parameters of a traditional diesel engine. The results show that the emissions of unburned methanol and formaldehyde reduce first and then increase with the increase of load. The emissions of unburned methanol and formaldehyde reduce more effectively by increasing spark advance angle under small loads. With the increase of engine speed, the emissions of unburned methanol increase, while the emissions of formaldehyde increase first and then reduce. The increase of EGR rate reduces the emissions of unburned methanol and formaldehyde significantly. When the compression ratio increases, the emissions also reduce. And when the compression ratio increases to 17.5, the emissions are almost close to 0. In addition, the emissions reduce effectively with the increase of equivalent ratio when the compression ratio is small. The unburned methanol and formaldehyde mainly distribute in the gap areas of cylinder wall, bottom surface of cylinder head and top surface of piston.

Key words

high-compression ratio engine / methanol / unregulated emission / simulation

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ZHEN Xudong,LEI Xingxing,TIAN Zhi,GENG Jie,LI Runing,LI Xiaoyan. Analysis of Unregulated Emission for High-Compression Ratio Methanol Engine[J]. Vehicle Engine. 2023, 0(3): 52-58 https://doi.org/10.3969/j.issn.1001-2222.2023.03.009