This study examines how a diesel engine behaves when ethanol and butanol are mixed with regular diesel fuel in different proportions. The aim is to determine whether these cleaner, renewable fuels can partially replace diesel without compromising engine performance while reducing harmful emissions. To do this, several fuel blends were prepared and tested in a diesel engine under different load conditions and ratios (D85E7.5B7.5, D80E10B10, D75E12.5B12.5). During the experiments, important performance factors such as fuel efficiency, fuel consumption, and exhaust temperature were recorded. At the same time, emissions such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and smoke levels were measured to assess the environmental friendliness of each blend. The results show that adding ethanol and butanol improves the combustion process because these fuels contain oxygen, which helps the fuel burn more completely. This leads to lower emissions of pollutants like CO, HC, and smoke, making the engine cleaner compared to using pure diesel. However, when the proportion of ethanol and butanol is increased too much, the engine may consume more fuel and show a slight drop in efficiency, mainly because these fuels have lower energy content than diesel. In some cases, higher blends can also affect how smoothly the engine runs. Overall, the study suggests that using an optimal mix of ethanol and butanol with diesel can provide a good balance between performance and emission reduction, making it a practical and eco-friendly alternative for diesel engines.
Krishna et al. (Thu,) studied this question.
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