Effect of SI Engine Operating Temperature Fuelled with Gasoline and Ethanol Blends for Better Emission Characteristics

It is very difficult for an I C Engine to operate uniformly in various regions of the India because of the different atmospheric temperature gradients varies between 0°C to 50°C, hence indifferent heat transfer rate creates indefinite emission standards. The purpose of this study is to analyze the problem experimentally to reduce the engine pollutant emission levels by using three-cylinder four-stroke SI engine computerized test rig used ethanol-gasoline different blended as engine fuel i.e. blended rates 0%, 5%, 10%, 15%, and investigate the engine operating temperature levels at which emission is better as compared to gasoline. The engine test results indicated that using ethanol-gasoline blended fuels, NOx and HC emissions decrease drastically as a result of the leaning effect caused by the ethanol addition. Results showed that while increasing the coolant temperature of the engine with ethanol proportion in blended fuel, NOx and HC emissions increases as compared to gasoline. The results obtained on engine operating parameters at 2500 rpm, i.e. NOx and HC have presented graphically with respect to the engine coolant temperature at different engine loads. The present study shows that it is suitable to operate the engine between 50°C to 70°C temperature for obtaining better emission levels for ethanol gasoline blends as compare to gasoline.