摘要：Alcohol is one of the renewable energy sources that can be locally produced as well as serves as asource that would help in considering the depleting natural petroleum fuel resources. However, its nonmiscibility with diesel, especially at high alcohol ratios, low cetane number and poor lubricatingcharacteristics have restricted its utilization in diesel engines. Usually, when ethanol contents in theblends reach 20-40%, high concentration of additives are needed to ensure the mixture homogeneityin the presence of high water contents, and to attain the required cetane number for suitable ignition.Therefore, selection of suitable additives plays a vital role for increasing the solubility of ethanol to alarger extent. Similarly, selection of a suitable surfactant is very important for obtaining long lastingemulsions. The surfactant span 20 and tween 20 have been selected here on account of theirfavourable properties and been focused in this study, as they have been used to stabilize the ethanoldiesel and water emulsions and as an alternate fuel. A single-cylinder, air-cooled, direct injection dieselengine that could develop a power output of 5.2 kW at 1500 rev/min was used. Engine performanceand emission data were used to optimize the blends for reducing emission and improving performance.
关键词：Alcohol;
Additives;
Alternate fuel;
Emulsion;
Pollution control
