Experimental Study On Improving The Combustion And Emission Of Diesel With Oxygenated Fuel

With the improvement of the overall living standards, more and more people care for their health and the surrounding environment. That the shortage of the energy leads to the more stringent emission regulations to improve the internal combustion engine combustion and emissions and these require that the corresponding manufactures and designers pay much attention on decreasing the fuel consumption and emissions to meet the requirements of the lower emission. That the control aim is to realize ultra-low emissions even to zero-emission provides a question confronted to the automobile industry, which is how to realize the low emissions and zero-emissions without sacrificing the engine thermal efficiency.Compared with gasoline engine, diesel engine with the advantages of high power,low HC,CO emissions and fuel consumption makes diesel engines have become more and more people of all ages. However, the disadvantages of diesel engine include soot emissions, and the growing shortage of oil resources and increasingly stringent emission regulations.Diesel engine emissions pollution attracted attention,controlling diesel engine emissions is faced with hard challenge.It was found that adding oxygen to diesel can reduce PM and NOx emissions simultaneous. In many alternative fuels, oxygenated fuels can reduce harmful emissions from diesel engines. DGM and DBE have a high cetane number and oxygen content compared to pure diesel, and they can soluble in diesel fuel easily, their physical and chemical properties have an impact on the performances of compression ignition engine.The investigation of the effects of physical and chemical properties such as the oxygen concentration cetane number and the latent vaporization heat on the compression ignition engine combustion and emissions have been performed without any modifications in a supercharger inter-cooler compression engine.DGM-diesel blend fuel and DBE-diesel blend fuel have much effect on the combustion according to the experimental study. Under the light load, the decrease percentage of the peak in-cylinder pressure is high and the mean indicated pressuredecreases also. Under heavy load, the decrease percentage of the peak in-cylinder pressure is a little bit low compared to the light load and the peak heat released decreases and vary as the load variation. The fuel consumption increases, the fuel consumption rate decrease and the ignition delay and combustion duration decrease when the engine fueled with DGM-diesel blend fuel and DBE-diesel blend fuelDGM-diesel blend fuel and DBE-diesel blend fuel have much effect on the emission according to the experimental study. The soot emission can decrease no matter what the engine load is when the engine fueled with both of the two blend fuels. Compared with the operation that the engine fueled with diesel, when the engine fueled with these two blend fuels, the CO emission decreases under the light and heavy load, and no obvious difference was observed under medium load, the HC emissions of the two blend fuels is almost equal under light load but it increases a little under medium and heavy load, the NOx emission is equal under light and medium load and decreases under heavy load.