Effects of isopropanol-n-butanol-ethanol blends on combustion and emissions performance in a spark assisted compression ignition (SACI) engine

Xianglong Meng, Fangxi Xie, Yu Liu, Xiaoping Li, Beiping Jiang, Xiaona Li and You Zhou

Renewable Energy, 2025, vol. 244, issue C

Abstract: To achieve carbon peaking and carbon neutrality goals, it is urgent to improve the thermal efficiency of engines and application of carbon-neutral fuels. The renewability and low emissions of isopropanol-n-butanol-ethanol (I-B-E) blends were receiving increasing attention, and spark-assisted compression ignition (SACI) was a high-efficiency combustion mode suitable for future engines. Therefore, this article designed 11 different I-B-E blends and investigated their differences in combustion and emissions performance under SACI combustion mode. It was found that regardless of the load, there was little difference in the auto-ignition timing of various I-B-E blends. Increasing the content of isopropanol and ethanol in I-B-E resulted in a decrease in the ratio of auto-ignition, COVIMEP, COVPmax and COVPRRmax. Regardless of the I-B-E composition, there was no significant relationship between COVCA5-CI and COVCACI-90. At light load, increasing the energy ratio of ethanol in I-B-E blends increased ITE by 2.11 % compared to n-butanol. After the load increased, regardless of the load, adjusting the composition of the I-B-E blends appropriately can achieve highest ITE and lowest ESFC. Increasing the energy ratio of ethanol and isopropanol in I-B-E blends was beneficial for reducing BSNOx and BSHC emissions. The BSCO emissions were not significantly related to the I-B-E components.

Keywords: Isopropanol-n-butanol-ethanol; SACI; Combustion characteristic; ESFC; BSNOx emissions; BSCO emissions (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:244:y:2025:i:c:s0960148125003647

DOI: 10.1016/j.renene.2025.122702

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