Abstract
The evaluation for the fuel concentration near the spark plug is important for direct injection gasoline engine to improve the thermal efficiency with stratified concentration of fuel mixture. This study investigated the cycle to cycle variations for the fuel concentration near the spark plug region using Large Eddy Simulation (LES) which can realize to simulate the cycle variation for the flow field. The results show that the LES can evaluate not only the differences of mean value but also deviation regarding the local fuel concentration between engine operating conditions.
