Effect of Injection Timing & Split Injection on Different Piston Bowl Configuration in a DI Diesel Engine

AbstractThe engine performance is generally governed by various parameters like peak pressure, static temperature, heat release rate, knocks emission, etc. However, these parameters are intern influenced significantly by varying the swirl ratio, split injection and the piston bowl configurations. Split injection is one of the most powerful tools that decrease soot and Nox emission. A better understanding of in-cylinder fluid motion during induction process could improve the combustion process and burning rates of compression ignition engines. Hence, this investigation aimed to develop a numerical model for in-cylinder fluid motion to study the effect of variation of swirl ratio, split injection, injection timing and piston bowl geometries on the engine performance characteristics. The model was developed in computational fluid dynamics (CFD) code, ANSYS FLUENT. The simulations were conducted for the combinations of swirl ratio, three split injection, injection timings and four piston bowl geometries. The simulation results revealed that, the split injection and injection timings and adopting suitable combination of combustion chamber configuration would greatly enhance the engine performance, besides reducing emission level to a greater extent