Effect of Using Gasoline-Jatropha Blend on Performance of Two-Stroke Combustion Engines

Abstract

In this work, laboratory experiments were carried out at the Military University of Kerrari for a two-stroke single-cylinder engine, Specification of engine (Engine Model is Bajaj auto, Maximum Power and Maximum Torque equal to 4.63 k w and 9 N.m respectively). A mixture of gasoline and jatropha oil was used as an alternative fuel for fuel used as a standard gasoline-Fuchs engine oil, model was used to reduce the ratio of exhaust emissions by determining optimal mixing ratio and maintaining good performance. Gas analyzers for gas emission analyses, and a device to measure the speed of the engine rotation, tacometer, was used, and readings were taken in the experiments at different speeds of rotation and different mixing ratios of fuel and oil. The gases analyzed are: NOx, CO, CO2, and HC. At speeds of 1500-2500 RPM, there was decrease in the amount of NOx and CO2 emitted from exhaust gases, when increasing rotational velocity. In the case of carbon monoxide (CO) and hydrocarbons (HC), it was found to increase by increasing the rotational speed. However; when increasing the ratio of mixing oil to gasoline, there was an increase in the amount of nitrogen oxides (NOx), carbon dioxide (CO2), hydrocarbons (HC) and carbon monoxide (CO). The dynamometer was used to measure the torque and the fuel consumption rate per second, the results were used in the calculation of the indicated power, brake power, machine's thermal and mechanical efficiency. Then the output was analyzed through the statistical analysis program. The analysis found the following results: Blend B20(The mixture consist of 80% gasoline and 20% lubricant oil) through the different ratios of mixtures give the best results for the best mixture in terms of good performance of the brake and indicated power and the mean effective pressure, thermal efficiency, mechanical efficiency and fuel consumption.