Akademik Veri Yönetim Sistemi
FUEL, cilt.407, 2026 (SCI-Expanded, Scopus)
In this study, the use of n-butanol at different compression ratios and different lambda values in a single cylinder homogeneous charge compression ignition engine was investigated experimentally. A spark ignited-mode converted Ricardo Hydra with variable compression ratio was used as the test engine. The findings are presented as a working map. In this study, imep maps, in-cylinder pressure and rate of heat release change, start of combustion, combustion duration, indicated thermal efficiency, maximum pressure rise rate and emissions were explained in detail. The addition of n-butanol to high reactivity n-heptane allowed the control of the homogeneous charge compression ignition combustion phase. The oxidation reactions were slowed down and most of the combustion took place around the top dead center. This allowed the achievement of an indicated thermal efficiency in the range of 35% to 44% and simultaneous reduction of carbonmonoxide and hydrocarbon emissions. Although the widest operating range was obtained with the reference neat n-heptane, by increasing compression ratio, the operating range of n-butanol-containing blend fuels could also be extended. Low reactivity n-butanol also partially reduced knocking, which is a major problem of homogeneous charge compression ignition combustion. Compared to the reference neat n-heptane, hydrocarbon emissions could be reduced by an average of 50% when using B60 fuel. This study clearly demonstrated that n-butanol is an ideal fuel type for homogeneous charge compression ignition engines.