A multi-coupled Eulerian-Lagrangian solver for airblast injectors including liquid film evolution and primary breakup - Numerical model

A multi-coupled Eulerian-Lagrangian solver for reacting sprays integrated with a film solver based on the thin film approximation has been developed in the framework of the open source code called OpenFOAM. Interactions between the different phases have been considered, with particular attention to the liquid film primary breakup which was modelled introducing a new phenomenological model. The computation of droplet population SMD is based on literature correlations starting from the solution of the gas-phase and liquid film. Different criteria to determine the breakup locations have been introduced as well as different strategies to accelerate solution towards steady-state. This work is divided into two different parts: the first one deeply describes the numerical model and its validation whereas in the second one an application to an industrial combustor is considered. In this paper the first part is presented; the companion paper reporting the application is published in the same conference.