Ethanol Blended in Spark Ignition Engines
6. CONCLUSION
Blend of gasoline and ethanol as a fuel in spark ignition engine produces low emission compared combustion of pure hydrocarbon fuel (E0). Otherwise, use of ethanol as an additional fuel in gasoline will also increase power and engine efficiency.
Consistency reduced emissions and increased engine performance on conditions of standard setting particularly in spark ignition engine is obtained if the concentration of ethanol in gasoline up to 20%. In these conditions the existence of ethanol in gasoline acts as octane booster so that the power, torque and efficiency is increased and fuel consumption decreased even detonation minimize occurrence of each cycle.
Combustion of ethanol 25% - 40% as a blended fuel in spark ignition engines will reduce engine performance and increase emissions if using a conventional engine with a standard setting, which range of compression ratio 6/1 – 10/1. To overcome it is necessary to adjust the compression ratio based on the octane number value of the mixture, which every increase of 5 octane numbers need adjustment 1 compression ratio.
On the composition adjustment of the compression ratio would influence in better of excess air and ignition timing, so that in this condition is not required settings on two parameters.
Combustion gasoline and ethanol blended at high composition in the spark ignition engine requires adjustment on three main parameters simultaneously, namely compression ratio, ignition timing and lambda. It’s not only depend on octane number, but type of machine and engine operating conditions are also taken into consideration in order to produce greatest engine performance
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