AUTHOR=Ziheng Zhao , Xiaolong Chen , Yuxiu Jiang TITLE=Prediction of combustion and exhaust emissions of a CI engine fueled with diesel-biodiesel blends with different EGR rates JOURNAL=Frontiers in Energy Research VOLUME=11 YEAR=2023 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2023.1205840 DOI=10.3389/fenrg.2023.1205840 ISSN=2296-598X ABSTRACT=

In this paper, the effects of diesel-biodiesel blends with different exhaust gas recirculation (EGR) rates on cylinder pressure, cylinder temperature, brake specific fuel consumption (BSFC), and brake thermal efficiency (BTE) of diesel engines are investigated. The emissions of nitrogen oxides (NOx), carbon monoxide (CO), hydrocarbon (HC), and soot are also predicted to some extent. In this paper, a 3D-computational fluid dynamics (CFD) model of the in-cylinder combustion of a diesel engine is developed using the simulation software CONVERGE combined with an improved kinetic mechanism. A series of sub-models including the combustion, injection, and emission models are selected and presented, and the model's accuracy is verified based on experimental results. The results show that the cylinder pressure and in-cylinder temperature show a decreasing trend with an increasing EGR rate. In addition, BSFC increases with increasing EGR rate, and BTE decreases accordingly. When the EGR rate increased, the emission of NOx decreased significantly, and the higher the EGR rate, the more obvious the decrease. The emission of soot, HC, and CO tended to increase with the increase of the EGR rate.