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This paper investigates the performance and emissions characteristics of a diesel engine fueled by biodiesel at partial load conditions. Experiments were conducted on a Renault K9K common-rail fuel injection diesel engine using mineral diesel and blends fuels of 6% and 10% with biodiesel obtained from corn oil and sunflower oil. The testes were made for 50%, 75% and 100% engine load. During experimental tests were measured the engine torque and the emissions of CO, CO2 and NOx. The engine torque for engine fueled with biodiesel blends is higher than for diesel fueled with mineral diesel in all tests. The CO and NOx, emissions decrease for all blends, and the CO2 increase. These are the results of better oxidation and of lower carbon content of biofuels.

Biodiesel; emissions; partial load