3-D Numerical Simulation on the Working Process of a Gasoline Direct Injection Engine

The working process of a gasoline direct injection engine, which was developed by the R&D Center of FAW Group, was simulated with 3-D CFD package. The movement of working fluid in the intake ports and cylinder of the engine was analyzed. The fuel injection and fuel-air mixture formation processes of two injection strategies were compared and analyzed. The formation and development processes of tumble in cylinder were studied, and the influence of tumble on fuel-air mixture formation was investigated. The fuel injection, fuel-air mixture formation and combustion processes of two injection timings were compared. The results show that under the present condition, injection timing of SOI=420 degrees CA leads to better fuel-air mixture quality around spark plug at the ignition time, and that is in favor of the ignition and the flame propagation.