Effect of Fuel Injection Pressure and Spray Cone Angle in DI Diesel Engine Using CONVERGETM CFD Code

Abstract

Fuel spray and atomization play a critical role in the performance and emission characteristics of a direct injection diesel engine. In general the higher fuel injection pressure is favourable for better fuel atomization and may have the better combustion characteristics. It also needs to be making sure that the fuel spray should not hit the walls of the cylinder leading to unaccounted losses. The position of spray and its spread in combustion space is depends on the other parameters such as spray cone angle, nozzle location and orientation etc. The present study analyses the performance and emissions of a diesel engine with respect to fuel injection pressure and spray cone angle using a CONVERGETM CFD code. The simulation results showed that increase in fuel injection pressure increases the performance but at the same time there is a trade-off observed in NOx and soot emissions. The CFD simulations reveal that the Spray cone angle has also a significant effect on the performance and emissions to a certain extent.