Experimental and CFD analysis of diesel engine emissions and combustion characteristics with premixed gasoline fuel

Abstract

This study investigates the effects of gasoline-premixed fuel on emissions and combustion characteristics in a compression ignition engine. A multi-cylinder, four-stroke diesel engine was analyzed using both experimental and computational methods. Emission and combustion parameters were measured at varying loading conditions for two gasoline–diesel blends and compared with pure diesel at a constant engine speed. Numerical simulations were conducted using the AVL Fire-CHEMKIN coupler for emission and combustion modeling, while CHEMKIN was used for chemical reaction modelling. Simulated results were validated against experimental data, showing minor deviations in mean effective pressure and emissions. The in-cylinder pressure data exhibited strong agreement with experimental results. The gasoline–diesel blends demonstrated longer ignition delays compared to pure diesel, influencing combustion characteristics. Additionally, the mole fraction of unburned hydrocarbons increased with gasoline blending. These findings provide insights into alternative fuel applications for compression ignition engines, contributing to advancements in fuel efficiency and emission reduction strategies.

 Keywords: Computational fluid dynamics ;  diesel engine emissions; diesel engine performance; premixed gasoline fuel