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Experiments were performed in an optically-accessible DI Diesel engine to investigate the effects of the addition of two oxygenated blending compounds to Diesel fuel, dimethoxymethane (DMM) and dimethylcarbonate (DMC). The focus of the study was to determine whether the structure of the oxygenated compound affects the production of soot. Laser light extinction was used to measure soot variation during combustion as well as exhaust soot levels. NOx, CO2 and CO concentrations in the engine exhaust were also measured using gas analyzers. Each oxygenated compound was blended into the base Diesel fuel to obtain 2% and 4% oxygen by mass. Heat release analysis showed that modifications of the heat release characteristics from those of the base fuel were significant, with increases of up to 1.7° in ignition delay and increases in the amount of premixed burn. The addition of the oxygenated compounds decreased the peak level of soot during combustion as well as the exhaust soot levels.

Experiments were performed in an optically-accessible DI Diesel engine to investigate the effects of the addition of oxygenated blending compounds to Diesel fuel. The focus of the study was to determine how the structure and boiling point of the oxygenating compounds affect the emissions of NOx and soot. NOx, CO2 and CO concentrations in the engine exhaust were measured using gas analyzers. Laser light extinction was used to measure time-resolved, in-cylinder soot concentrations. Two different oxygenate families, maleates and glycol ethers, were chosen to study the effects of molecular structure on emissions. For both families, oxygenates of various boiling points were examined within the distillation range of the base Diesel fuel. All oxygenates were blended into the base Diesel fuel to obtain two percent oxygen by mass.