ENGINE PERFORMANCE BEHAVIOR OF WGOEE-DIESEL FUEL BLENDS IN COMPRESSION IGNITION ENGINE

Abstract

A 2.43 kW stationary compression ignition engine was tested on B5 (5% by volume of waste groundnut oil ethyl ester blended with 95% by volume of fossil diesel fuel), B10, B15, and B20 blended diesel fuel. A benchmark test was conducted on the test bed with 100% fossil diesel fuel (DF) Io evaluate the engine performance in terms of brake power, brake mean effective pressure, specific fuel consumption and brake thermal efficiency at maximum engine speed. Engine performance tests were also conducted for B5, B10, B15, and B20 wasted groundnut oil ethyl ester (WGOEE) blended oil samples, and their observed engine performance behavior was compared with the benchmark test results. The study showed that the engine exhaust temperature for B5, B10, B15 and B20 WGOEE blended oil samples are 5.0%, 6.0%, 16% and 40% higher than fossil DF. The brake power of B5 and B20 blended fuel samples are lower by 3.7% and 24.69%, while B10 and B15 sample produced similar result in brake power as fossil DF. The brake mean effective pressure (b.m.e.p) for B5 and B20 blended fuel samples are 3.83 % and 24.61% lower in comparison Io the tested fossil diesel fuel, while B10 and B15 blended fuel sample generated similar amount of b.m.e.p as fossil DF. Furthermore, B5 and B10 blended fuel samples exhibited 16.39% and 12.55% lower fuel consumption than fossil DF, whereas B15 and B2(0 fuel samples generated 19.98% and 14.66% higher specific fuel consumption than fossil DF. The dense and viscous nature of WGOEE in the fuel mixture slightly affects the atomization and spray efficiency of blended Oil Through injector nozzles, and consequently slows down the combustion process and lowers the brake power and thermal efficiency. This study in effect has revealed that by blending WGOEE with fossil DF at lower proportions (i.e B5, B10, B15) produced somewhat equal amount of brake power, and slightly higher fuel economy for B5 and B10 blended fuel samples respectively.