Multi-Dimensional Simulation Of Intake And Combustion Process In Gasoline Engine

The intake process of the internal-combustion engine has a significant impact on performance. For spark ignition combustion engine, the more fresh air entering the cylinder per cycle,the more heat it can emit,thus increase the engine power and torsion. Three-dimensional simulations of a gasoline engine induction and combustion process were performed in this paper with AVL FIRE.The three-dimensional moving meshes including the intake ports, intake valves and cylinder were generated. Has demonstrated the spatial distribution and change along with the crank angle of flow field during the intake process in detail, emphatically analyzed the flow field evolution rule, the flowing characteristic and the macroscopic parameter.The three-dimensional meshes for combustion were generated, in which proper grid resolution and time increments were chosen. The mathematics models for simulation of in-cylinder process were introduced for researching the combustion of the gasoline engine.Furthermore, the combustion system parameters were optimized. The effect of spark ignition model, ignition advance angle and mixture concentration were studied.