Abstract
In this study; 95 octane unleaded gasoline and bioethanol were tested as fuel in a spark-ignition engine by blending bioethanol with gasoline in certain proportions (2%, 4%, 6%, 8%, 10%). Tests were carried out at five different engine loads for a constant engine speed of 2500 rpm. The variations in engine performance parameters (brake thermal efficiency, brake specific fuel consumption, brake specific energy consumption) and exhaust emissions (HC, CO, CO2 and O2) were investigated on the basis of test fuel and engine load. According to the test results, with the increase of bioethanol ratio in the blend, brake specific fuel consumption values increased by 9.71% and brake thermal efficiency values decreased by approximately 4.97% compared to gasoline. There was decrease in HC and CO emissions and an increase in CO2 emissions with bioethanol addition.
Highlights
Energy is one of the fundamental and driving needs of a countries economic and social development
In this study, engine performance and exhaust emission of a single cylinder spark ignition engine used gasoline-bioethanol blends were examined and the results were presented as follows
Due to the fact that it has lower thermal value than gasoline and higher combustion rate due to oxygen content, bioethanol has a negative effect on performance parameters by decreasing in the effective pressure affecting the piston surface
Summary
Energy is one of the fundamental and driving needs of a countries economic and social development. They performed their experiments at different engine speeds varied from 1000 to 4000 rpm for full throttle position It was observed decrease in brake thermal efficiency, CO and HC emissions, while brake specific fuel consumption increased with alcohol addiction. Ghobadian [16] have tested the engine with E5, E7.5, E10, E12.5 and E15 gasoline-ethanol blends to investigate the performance and emission behavior of a four-cylinder, four-stroke spark ignition engine They stated that usage of ethanol in blend increased brake torque, and brake power and improved the exhaust emissions but it decreased brake specific fuel consumption. Bioethanol is a renewable alcohol with high energy value that can be produced with local sources It is used as alternative fuel in spark plug ignition engines due to the high octane number. The obtained results were compared with gasoline, and have been presented as graphically
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