Engine Performance of Dual Fuel Operation with In-cylinder Injected Diesel Fuels and In-Port Injected DME

摘要

The demand for new and alternative fuels such as biodiesel or synthetic fuels has seen sharp increase, however their composition and properties can affect significantly engine performance and emissions. The effects of the type of fuel on diesel engine performance have been revealed as very important in new engine. Dimethyl Ether (DME) is potential alternative option to further facilitate the limitations of fossil fuel source in a near future. The benefit of DME fuel properties, cctanc number and heating value, is higher than the diesel fuel. In the present work was carried out to further the understanding into the engine performance and exhaust gas emission on single cylinder common rail. The engine fueled with diesel fuel and injecting additional DME fuel into the cylinder via intake manifold. The effect of DME additions, 0 - 90% of the total fuel, were demonstrated under different steady state operated conditions. The combustion of the DME port injection were improved thermal efficiency and reduced exhaust emission compared with the engine was operated with diesel fuel. The exhaust gas emission, i.e. nitrogen oxide and black smoke, was reduced from the engine operating at 30% DME concentration was used. In additions, diesel fuel consumption was reduced up to 22.36% lead to increase the brake thermal efficiency. Furthermore, the higher concentrations of DME are required to improve hydrocarbon and carbon monoxide emissions. However, optimised injection timing are very important in improving the engine performance under different engine operating conditions.