Simulation study on the influence of fuel injection strategy on the soot emission of dual-injection engine

A 2.0T gasoline engine was modified to a dual-injection engine. Numerical simulation method is used study the influence of fuel type and injection strategy on in-cylinder mixture formation process, combustion process soot emission The results show that an appropriate increase in intake port ratio can improve uniformity air-fuel mixture. Increasing system, proportion directly injected into cylinder decreases oil film distribution reduced. Among three schemes, flame front D85 scheme reaches wall earliest, spreads faster; mass fraction generation with decrease GDI ratio. In particular, amount generated under D65GDI significantly