Effects of hydrogen direct injection on combustion and emission characteristics of a hydrous ethanol SI engine

IF 9.2 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2026-07-20 Epub Date: 2026-06-24 DOI:10.1016/j.ijhydene.2026.156174

Decheng Li, Xiumin Yu, Dawei Zhao, Zhipeng Hu, Jufang Zhang, Haopo Sun

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Abstract

Hydrous ethanol is a low-cost, carbon-neutral spark-ignition engine fuel, yet it features low combustion rate and poor cyclic stability. This study proposes a combined injection strategy of hydrogen direct injection and hydrous ethanol port injection. The effects of hydrogen blending ratio (HBR, 0–20%) and ignition timing (0–12 °CA BTDC) are investigated. The results show that hydrogen addition accelerates combustion, shortening flame development and rapid combustion periods by up to 58.6% and 25.8% at 20% HBR. In terms of engine performance, the IMEP increases by 4.16%, indicated specific fuel consumption decreases by 4.00% and COV_IMEP is reduced by 54.09% at 20% HBR. For emission characteristics, HC and CO decrease by 14.8% and 27.2% respectively at 20% HBR, while NO_x rises. This combined injection strategy facilitates the clean and efficient application of hydrous ethanol and hydrogen in engines.

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氢直喷对含水乙醇发动机燃烧和排放特性的影响

含水乙醇是一种低成本、碳中性的火花点火发动机燃料，但其燃烧速率低、循环稳定性差。本研究提出了氢直接注射和含水乙醇端口注射相结合的注射策略。研究了掺氢比（HBR, 0 ~ 20%）和点火正时（0 ~ 12 °CA BTDC）的影响。结果表明：在20% HBR条件下，加氢能加速燃烧，使火焰发展和快速燃烧周期分别缩短58.6%和25.8%；在发动机性能方面，IMEP提高了4.16%，表明比油耗降低了4.00%，COVIMEP在20% HBR时降低了54.09%。在20% HBR时，HC和CO分别降低14.8%和27.2%，而NOx升高。这种组合喷射策略促进了含水乙醇和氢气在发动机中的清洁和高效应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.