Experimental and numerical investigation of biogas energy as an alternative fuel to conventional gasoline

This work numerically investigates the potential of replacing neat gasoline with two different biogases in a single-cylinder, 4-stroke gasoline engine. The Diesel-RK simulation software is employed to analyze the engine’s power cycle. The results indicate that the peak cylinder pressure for gasoline is higher than for both biogases, primarily due to differences in fuel energy content. Both biogases exhibited lower combustion temperatures, resulting in a substantial reduction in NOₓ emissions by 59.4% and 52.3% for Biogas (I) and Biogas (II), respectively. The higher-octane number and self-ignition temperature of the biogases contributed to improved knock resistance compared to gasoline. Additionally, exhaust gas temperatures were higher for gasoline than for the biogases. The simulation outcomes were validated against available experimental and numerical studies, showing slight deviations within an acceptable range.