Study On The Effects Of Inlet Gas Composition On Compression-Ignition Combustion Engine

Reducing fuel consumption and engine emissions is the major objective in engine development in light of increasing concern about energy shortage and environmental protection. The main two solutions are improvement on conventional diesel engines and gasoline engines, and development of alternative fuel engines. Methanol has a rich source of raw materials and Reformed Methanol Gas (RMG) is an excellent hydrogen carrier. Now there hasn't been too much research on RMG fueled internal combustion engines. Therefore, the pre-mixed combustion and NOx emissions of RMG were investigated using numerical simulation based on chemical kinetics in this paper. Oxidizer improvement is another way to decrease emissions. Three-dimensional CFD program was used to simulate the effects of inlet gas composition on the combustion in diesel engines. And the corresponding experiments were carried out.Detailed chemical kinetics mechanism and CHEMKIN software were used to simulate the premixed combustion of a refitted Volvo TD100 engine fueled with RMG. The results show that the ignition timing and NOx emissions predicted by using single-zone combustion model have a good agreement with measured results, and RMG HCCI combustion is characterized by single-stage heat release. NOx emissions are very low. The key species (OH,H,O,HO2 and H2O2) histories were analyzed to determine important reactions and the overall reaction scheme for RMG. Supercharging was introduced to solve the problems of low output horsepower and inlet gas heating. It was found that appropriate supercharging without inter-cooling...