Study the Effects of Separate Nitrogen and Hydrogen Addition on Engine Performance and The amount of Pollutant Emissions in a High Speed Direct Injection Diesel Engine

In current research, the effects of separate Nitrogen and Hydrogen addition on engine performance and the amount of pollutants emissions have been investigated in a High Speed Direct Injection (HSDI) Diesel engine. For this purpose, the numerical results have been firstly compared to experimental data and good agreements have been to estimate the in-cylinder pressure, rate of heat release and the amount of NOx, soot and Co emissions. In current investigation, the ECFM-3z model has been applied to analyze the combustion process. In second phase of this research, the effects of separate Nitrogen and hydrogen addition in a range of 2-8 percent (based on 2% interval) have been studied. The results show that by applying the Hydrogen as a separate additive, the amount of CO and soot have been decreased by 54% and 89%, respectively. while using the separate Nitrogen addition causes the increase of these emissions by 86% and 146% respectively due to decreasing the available oxygen in combustion process compared to the neat diesel baseline engine case.