Emissions are among those crucial factors that create a huge stress on the people related to engine industry.LTC concepts like HCCI and PPCI are proved as potential solutions for reducing NOx emissions.The impact of ethanol premixed fraction on PPCI mode diesel engine has been investigated in this study.Various ethanol flow rates like 0.27,0.45,0.54,0.72 and 0.81 kg/hr are fumigated in conventional single cylinder diesel engine.Ethanol is used due to the fact that it is available naturally as well as manufactured industrially.The combustion,emission and performance characteristics are plotted for each and every load with various premixed fractions and then the results are compared to pure diesel operation.It is clear from the results that the range of stable operation is being confined by ethanol for different premixed fractions.It can be safely said that for all stable operation,the NOx emission is exceptionally less compared to pure diesel,though,the Un burnt Hydrocarbon & Carbon monoxide emissions are comparatively more.NOx and smoke are decreased for all the premixed fractions at full load.At medium load operations,less NOx,smoke opacity,CO and HC is obtained.Also,at low load operations,there is less NOx and smoke opacity up to premixed fraction 0.3,but HC and CO emissions increases on further increase in the premixed fraction.Keywords-Premixed fraction,homogeneous,HCCI,combustion,NOx,temperature.
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