Numerical investigation of a diesel jet at high injection pressure - several parametric studies

Abstract

The purpose of this work is to investigate the dynamic behaviour of a diesel spray. To this end, the calculation code used to simulate the spray is Fluent. The evolution of the jet is simulated using an averaged approach according to the Navier-Stokes equations. To complete the system of the averaged equations, we tested many turbulence models. The multiphase structure of the spray diesel is modelled within the Volume of Fluid (and its coupling with Level-Set models). The comparison of the penetration length of our numerical study by the experiment and by the calculation code AVBP gives a good agreement. Finally, we investigate the impact of several parameters (the ambient density, the diameter of the injection nozzle…) on the evolution of the diesel jet. The calculation results have contributed to an understanding of some physical phenomena governing the evolution of the diesel spray.