Investigation of the Ignition and Combustion Processes of a Dual Fuel Spray under Diesel-like Conditions using CFD Modeling

Recent research activities in the field of Diesel engines have shown the potential to reduce pollutant emissions and improve thermal efficiency by controlling fuel reactivity. However, understanding the impact of blending fuels with different physical and especially chemical properties on diesel-like spray mixing and combustion processes is still a challenge. Since the experimental techniques are still far from providing detailed temporal and spatial information about local spray conditions, CFD modeling tools arise as the key source of information to investigate the characteristics of these dual fuel sprays. In this frame, the present research focuses on modeling a dual fuel spray in diesel-like conditions, comparing different gasoline and diesel blends in terms of ignition characteristics and flame structure. The results confirm the suitability of the state of the art computational CFD modeling tools for reproducing the complex phenomena associated to dual fuel sprays. Moreover, the important benefits provided by dual fuel blends, considering the expected reduction in pollutant emissions as a consequence of the differences observed in terms of flame structure, are confirmed.