• atomization
• CFD
• combustion
• fuel injector

In the first part of this work it is investigated how results are dependent on mesh, numerical schemes and turbulence models, using a simplified 2D axisymmetric isothermal model of a modern fuel injector. Eventually it is established the minimum mesh resolution suitable to properly resolve the flow field through an airblast fuel injector.
In the second part of the work the results sensitivity to fuel boundary conditions is investigated, taking into account a quite wide range of initial fuel particles velocities and Sauter Mean Diameters derived from different theoretical breakup models. Eventually a new procedure for modelling fuel injector boundary conditions at high Weber numbers is established.
All CFD simulations in the present work are carried out for a single aero engine fuel injector, but the methodology eventually established for modelling fuel nozzle boundary conditions is expected to be valid for all air-blast atomizers of similar type.