Cerfacs Enter the world of high performance ...

You tube link : https://youtu.be/l9Ujw9hOJT0

Abstract :

SAFRAN Helicopter Engines has recently developed the spinning combustion technology in which the burnt gases from one injector travel tangentially along the combustor annulus towards the neighboring injectors. Compared to a conventional design, this arrangement modifies the ignition process, which is a critical phase for aeroengines. In addition to that, few ignition studies in literature feature actual aeronautical igniters. This thesis aims to numerically reproduce the kernel formation and flame propagation at conditions occurring in spinning combustion engines fitted with aeronautical igniters at relevant operating conditions. For this objective, the in-house code AVBP has been used together with models for the energy addition from the igniter, semi-detailed chemistry and a recent version of the thickened flame model using a generic sensor and a static and dynamic formulation for the subgrid chemistry-turbulence closure term. The results have been compared to experiments from partner laboratories and show that the Large-Eddy Simulation calculations are able to reproduce the kernel formation and propagation in spinning combustion technology engines. An average error of 10\% in the time for complete chamber ignition was obtained when using a dynamic formulation of the subgrid chemistry-turbulence closure term. As a conclusion, this thesis gives further support to the use of LES as a tool for the design of combustion chamber systems in aircraft engines, in particular in novel configurations such as the spinning combustion technology.  

Jury :

Marc Bellenoue Prof., ENSMA Poitiers, Member

James R. Dawson, Prof., NTNU Norway, member

Andreas Kempf Prof,. University Duisburg-Essen, Referee

Denis Veynante CNRS Research Director, Referee

Bénédicte Cuenot, CERFACS, Advisor

Eleonore Riber, CERFACS, co-advisor

Stéphane Richard, co-advisor