Optimization Study of Fuel Blends in an SI Engine Running with Gasoline/Isopropanol/Isoamyl Alcohol Blends

In this study, was focused on determining the optimum alcohol mixtures of gasoline iso-propanol and isoamyl alcohol mixtures according to minimum exhaust emission and BSFC (Brake Specific Fuel Consumption) and maximum CGP (Cylinder Gas Pressure) parameters. In the optimization study, 3 different iso-propanol (vol. 10, 20 and 30) and 3 different iso-amyl (vol. 5, 10 and 20) rate were used as input parameters at maximum power and torque speed. The experimental study, it was performed in a single-cylinder air-cooled, spark-ignition engine (SI), at full throttle position, maximum power speed (3600 min-1) and maximum torque speed (2400 min-1). In the optimization study, ANOVA supported RSM (Response Surface Methodology) and CCD (Central Composite Design) were used as the experimental design. In the results obtained, it was determined as an effective parameter for BSFC of engine speed, and for CGP were effective also alcohol types along with engine speed. As a result of the optimization, as the optimum operating parameters were determined as 3600 min-1 engine speed, 27.7778% iso-propanol and 13.9394% iso-amyl alcohol. In the confirmation tests, the error rates were obtained as 3.36%, 3.45%, 9.81%, 4.76% and 4.67% for BSFC, CGP, HC, CO and NOX, respectively.