Introduction and Motivation

Due to their convenient way of storage and transport liquid fuels are used for combustion in aero engines. Prior to combustion the liquid fuel needs to go through two stages in order to form a flammable gaseous flow. In the first stage the liquid fuel is atomized to form a cloud of particles. In the following these particles are vapourized resulting in the required flammable gas.

Today Computational Fluid Dynamics (CFD) plays an important role in the optimization of aero engine components like the combustor. However most combustor simulations neglect the modeling of spray and the evaporation of the droplets. Instead the computation starts with a given flammable gaseous mixture. In doing so the optimization potential cannot be fully exploited. This project focuses on including the spray and evaporation processes in order to simulate the combustor more accurately.

Method and Theory

In this work an unstructured CFD code is to be extended by a two-phase reacting flow for Large Eddy Simulations (LES). The approach used for the two-phase flow is an Eulerian-Lagrangian. In this approach the particles of the dispersed phase are each tracked individually. Phase coupling is accounted for by introducing source terms into the equations for the continuous phase.


This project involves the following steps:

  • Implementation of a two-phase-flow model for LES (Eulerian-Lagrangian approach)
  • Implementation of a spray evaporation model
  • Coupling with an available combustion model
  • Verification and Validation