Abstract
In this study, multi-cycle combustion simulations were conducted using Large Eddy Simulation (LES) to analyze cycle-to-cycle variations in a single-cylinder engine under varying conditions of fuel injection methods (port fuel injection (PFI) and direct injection (DI)), air-fuel ratio, and engine load. Specific focus was placed on the fuel concentration, velocity, and sub-grid scale (SGS) turbulence intensity near the spark plug at the spark timing, examining their relationship with cycle-to-cycle variations and subsequent combustion characteristics.
