Abstract
Hydrogen can be a viable alternative fuel for modern diesel engines, offering benefits on efficiency and performance improvement. The paper analyses the results of a thermodynamic model developed by authors in order to study the influence of Hydrogen addition on a process like vaporization, mixture forming, and combustion at the level of diesel fuel droplets. The bi-zonal model is applied for a dual-fueled diesel engine K9K type designed by Renault for automotives. For the engine operating regime of 2000 rpm speed and 55% engine load, the diesel fuel is partially substituted by Hydrogen in energetic percents of 6.76%, 13.39%, and 20.97%, the engine power being maintained at the same level comparative to classic fueling. At Hydrogen addition, the diesel fuel jets atomization and diesel fuel droplets vaporization are accelerated, the speed of formation of the mixture being increased. Comparative to classic fueling, the use of Hydrogen leads to diesel droplets combustion intensification, with a shortened autoignition delay, reduction of combustion duration, and increase of flame radius.
Highlights
The atomization of the diesel fuel jets and the vaporization of the diesel fuel droplets react to the gaseous environment established in-cylinder, the environment changed by Hydrogen presence
Once with the increase of Hydrogen in-cylinder content the time needed for diesel fuel breakup starts to decrease compared to diesel fueling, Figure 3, at xc = 20.97, the decrease being around 12%
Mixture forming and combustion of diesel fuel droplets at injection mixture of air-Hydrogen can complete the field of Novelty aspectsinto of avaporization, mixture forming and combustion of knowledge diesel fuel of Hydrogen use in diesel engines
Summary
The use of alternative fuels to fuel internal combustion engines have been promoted in order to reduce the pollutant emissions emitted by automotives. In the future, years of 2030–2050, the use of alternative fuels will ensure the reduction of pollutant emissions and greenhouse gases (GHG) of automotive internal combustion engines (ICE)’s [1,2,3]. A higher emission level of CO2 can amplify the greenhouse effect [4]. The main pollutant substances emitted by the internal combustion engine are CO, NOx , HC, and particles. These substances are toxic and a decrease in their level is necessary.
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