Fluiddynamic Instability

Image injection

Injection into quiescent air

In order to investigate the stability of liquid sheets both a linear and non-linear stability analysis will be performed. Break-up o liquid jets is important for injector nozzles of a Gasoline Direct Ignition (GDI) engines. The various parameters affecting the breakup of the liquid sheet in to droplets will be identified and compared with experimental results and theoretical results. A Computational Fluid Dynamics (CFD) analysis of the liquid sheet breakup will also performed using the OpenFOAM code based on a VOF-LES method. The results of the stability analysis and experimental data will be compared with the predictions obtained by a CFD LES model. Thus, the study aims at the improvement of the design of the fuel injection nozzles used in GDI engines.