PhD defense : Francis Shum-Kivan (CFD)
Jeudi 15 juin 2017 à 14h00
Thèses Cerfacs le jeudi 15 juin 2017, à 14h, en salle de conférences du Cerfacs
LARGE EDDY SIMULATION OF SPRAY FLAMES AND MODELLING OF NON-PREMIXED COMBUSTION
Abstract:
The combustion of hydrocarbons still represents a major part of the worldwide production of energy, especially in the aeronautical industry. Most industrial burners are fed with liquid fuel that is directly injected in the combustion chamber, generating a strong interaction between the spray, the turbulent flow and the flame. In order to provide a better understanding of turbulent spray flame complex structures, a numerical study has been performed on the two-phase flow burner KIAI which has been experimentally fully characterized. Numerical simulations consist of Large Eddy Simulation coupled to Discrete Particle Simulation for the dispersed phase (LES-DPS). A detailed analysis of the flame structure shows that non-premixed combustion plays an important role in this type of spray flame. This motivates, in a second step of the present work, the development of a new approach to model turbulent diffusion flames. The model is based on the response to the mesh, strain rate and wrinkling. The global flame heat release is analyzed through configurations of increasing complexity and the capacity of the model to describe it is evaluated.
Key words:
LES-DPS, spray flames, non-premixed combustion
Members of the Jury:
Denis VEYNANTE Research Director, CNRS-EM2C Referee
Stéphane JAY Research Engineer, IFPEN Referee
Bruno RENOU Professor, CORIA Member
Fabien HALTER Professor, ICARE, Member
Bénédicte CUENOT Senior Researcher, CERFACS Advisor
Eléonore RIBER Senior Researcher, CERFACS Co-Advisor
