Effects of ethanol-gasoline blends on exhaust and noise emissions from 4-stroke S.I.engine

الملخص EN

Considering pollution problems and energy crisis today, investigations have been concentrated on lowering the concentration of toxic components in combustion products and decreasing fuel consumption by using renewable alternative fuels.

In the present work, the effect of ethanol addition to gasoline on the exhaust emissions and noise level has been experimentally investigated at various engine loads.

Results of the engine test indicated that using ethanol-gasoline blended fuels increases the power output of the engine dramatically (up to 50 %).

While the CO and HC emissions decrease as a result of the leaning effect caused by the ethanol addition ; and the CO2 emission increases because of the improvement of combustion.

Also, it was noted that the noise level emission increases slightly with the increase of ethanol content.

Finally, the results showed that ethanol can be used as a supplementary fuel to gasoline in modern spark ignition engines without major changes, and it can help to save our environment from toxic pollutants and to save a considerable part of the available oil.