Análise do desempenho de um motor a combustão de ignição por compressão monocilíndrico no funcionamento bicombustível diesel-etanol

Abstract

The main aim of this work was to investigate experimentally the effects of a compression ignition engine operating in dual fuel mode, diesel-ethanol. The experiments were conducted in a single-cylinder engine coupled to a dynamometer at full load from 1800 to 3000 rpm. Hydrous ethanol was injected at the engine intake manifold by a port fuel injector, representing ethanol substitution rates from 11.5% to 52.3% in energy. The experiments resulted in maximum decrease in the smoke index about 69% and reductions in emissions of CO, CO2 and exhaust gas temperatures. A maximum increase of 26.2% was observed in thermal and 22.9% in exergy efficiency. Nevertheless, an increase in HC emissions and total specific fuel consumption was noted. No significant changes were observed in the torque and power curves. The results were satisfactory, showing the feasibility of using ethanol as a renewable and alternative fuel in ignition compression engines.