Numerical simulation of the performance and emission of a diesel engine with diesel-biodiesel mixtures

Abstract

Among the alternative fuels, biodiesel is considered as a sustainable option for diesel engine. In this study, the methyl ester of waste cooking oil was produced using the transesterification method. The suggested biodiesel is mixed with different percentages (5% and 10%) on a volume basis together with diesel fuel and tested in on a four cylinder, four stroke, direct injection, diesel engine at different engine speeds (1100 to 1400 rpm at an interval of 100 rpm) under full load in the faculty of mechanical engineering, nowshahr imam Khomeini university of marine sciences. The experimental side is verified with simulation study done by GT-Power software, which shows very good agreement between simulation and experimental result, more specifically variation of only up to 6.3% in torque, 4.8% SFC and 5.6% in NOx and CO was found. The simulation results showed by increasing the engine speed and higher biodiesel to diesel ratios for biodiesel (B10), torque increased by 4.4%, whereas specific fuel consumption (SFC) decrease by 4.45%. Also, compared to the diesel fuel, NOx increased by 1.8%, whereas CO decreased by 37.67%. The simulation and experimentally results revealed that overall B10 provides better performance and significantly reduced engine emissions. Therefore, the simulation work due to lower costs and increased computational speed compare to the experiments can reduce the cost of research.