Performance, emission and combustion characteristics of CI dual fuel engine powered by diesel/ethanol and diesel/gasoline fuels

摘要

The effects of gasoline/diesel and ethanol/diesel on combustion, fuel economies and exhaust emissions of dual fuel direct injection diesel engine were experimentally investigated. Tests were carried out based on a direct injection engine at a constant engine speed of 1500 rpm and full load. The results showed that with the fraction of gasoline and ethanol increasing, ignition delay was noticed. Operating parameters of dual fuel engine powered with gasoline were at the same level as for engine powered by pure diesel fuel. In case of powering by ethanol the values of thermal efficiency and indicated mean effective pressure increased (about 13 %) with increase of ethanol fraction up to 55 %. For maximal analyzed gasoline fraction specific NOx (nitrogen oxide) emission increased by 2.7 times, but for ethanol the increase was lower and it was by 2.5-times compared to reference values obtained for an engine powered by pure diesel fuel. Regarding THC (total hydrocarbons) emission up to 45 % of ethanol or gasoline energetic fraction no significant increase in specific THC emissions was noted. With the increase in ethanol and gasoline fraction in combustion process causes lower CO (carbon monoxide) emission. It turns out that it is possible to co-combustion of gasoline in a compression-ignition internal combustion engine.