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Multi-phase turbulent reacting flow modeling and its impact on the thermo-acoustic stability of next generation of aero-engines

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Required Education : Master de recherche ou équivalent
Start date : 1 September 2023
Mission duration : 3 years
Deadline for applications : 30 November 2023
Salary : > 21 600 €/year (gross)




Context:  With the uprise of ever more efficient combustion systems for aviation which target ever more reduced pollutant  emissions and reduced fuel consumptions, the risk of thermo-acoustic instabilities to arise becomes critical. Indeed, resulting from a synchronization between the burner actoucis and the flame, these instabilities remain today a clear scientific challenge which are very often only diagnosed while testing the final product. Being able to anticipate and ultimately mitigate such resonant oscillations while designing next genration of lean aeronautical combustors is a key industrial aspect for successful and viable solutions. In collaboration with SAFRAN AE, CERFACS’ CFD team has invested masively in numerical tools to leverage such a difficulty and has acquired worldwide recognition on the matter. This PhD work contirbutes to these past efforts and collaboration by addressing multi-phase turbulent reacting flows and their impact on thermo-acoustics.



In this context, the main objective of this PhD offer is to develop and validate liquid phase models (injection, film and atomisation models) developped at  CERFACS and made available in its Large Eddy Simulation solver AVBP for accurate numerical prediction of the sol called Flame Transfer Functions (FTF). These FTF’s will then have to be incorporated in the acoutic suite of tools able to address engine stability for a wide range of operating conditions and to qualify and eventually mitiagte thermo-acoustic instabilities arising while designing next generation of lean aeronautcial combustors. Conducted within the CFD team at CERFACS, this research project will benefit from past and on-going efforts as well as research collaborations with French laboratories like EM2C (CentraleSupelec), CORIA (CNRS, Rouen), IMFT (CNRS, Toulouse).



Dr Laurent Gicquel   lgicquel@cerfacs.fr