Performance and emission characteristics of a CI engine fueled with hydrogen-enriched biodiesel
A. Velmurugan, Kubilay Bayramoglu, T. V. Rajamurugan, C. Rajaganapathy, S. Murugapoopathi, Senthil Sampath
article (Uluslararası, Hakemli) — Özet: The growing need to reduce emissions and improve efficiency in compression-ignition (CI) engines has accelerated research into hydrogen-assisted biodiesel combustion. The purpose of this study is to experimentally evaluate the effects of hydrogen enrichment on the performance, co
The growing need to reduce emissions and improve efficiency in compression-ignition (CI) engines has accelerated research into hydrogen-assisted biodiesel combustion. The purpose of this study is to experimentally evaluate the effects of hydrogen enrichment on the performance, combustion, and emission characteristics of a CI engine fueled with corn oil methyl ester (COME20). The experimental investigation was conducted on a single-cylinder, four-stroke, water-cooled, direct-injection CI engine operating at a constant speed. Hydrogen was inducted through the intake manifold at volumetric enrichment ratios of 13.32%, 19.98%, and 26.64%, while neat diesel operation served as the reference condition. Engine performance parameters, in-cylinder combustion characteristics, and exhaust emissions were measured over a wide range of engine loads. The results show that hydrogen enrichment significantly enhances combustion efficiency and engine performance. The highest hydrogen enrichment level (26.64% H2-COME20) resulted in the highest brake thermal efficiency (40.77%) and the lowest brake-specific fuel consumption compared to neat diesel. Hydrogen addition substantially reduced carbon monoxide and hydrocarbon emissions due to improved oxidation, while nitrogen oxides increased because of higher in-cylinder temperatures. Combustion analysis revealed increased peak cylinder pressure, higher heat-release rates, and shorter ignition delay as the hydrogen fraction increased. In conclusion, hydrogen-enriched COME20 fuels offer a practical and effective approach to improving efficiency and reducing carbon-based emissions in existing CI engines, providing a promising near-term pathway toward cleaner, more sustainable engine technologies.