Cerfacs Enter the world of high performance ...

The 28 May 2021 at 16h00

Phd Defense: Martin THOMAS – “Combustor – turbine interactions: hot spot migration and thermal environment prediction for a better understanding and design of helicopter engines”

Marie LABADENS |  Administration meeting room (webex), CERFACS Toulouse (France) |  


This PhD thesis, funded by SAFRAN Helicopter Engines, focuses on Large Eddy Simulation (LES) of the FACTOR test rig to investigate combustor-turbine interactions in the context of next generation lean combustion engines. The FACTOR test rig is a full annular non-reactive lean combustion simulator with a single staged high-pressure turbine located at the DLR in Göttingen. Another test rig featuring three sectors or 54° of the full annular DLR test rig is available at the University of Florence. Both rigs provide a huge amount of validation data. In this thesis, certain aspects of LES in turbomachinery are investigated in detail and the manuscript is divided into two parts dealing respectively with the modeling of cooling systems and an analysis of the flow field in the combustion chamber and high-pressure vane passage. First, a heterogeneous and a homogeneous coolant injection model for multiperforated plates in combustion chambers are tested against experimental results. From this first study it is shown that the heterogeneous model allows for a more realistic coolant jet representation and should be retained for future simulations. In gas turbine engines the application of coolant systems is not only mandatory in the combustion chamber, but also in the first stages of the high-pressure turbine. The next section therefore investigates the previously presented heterogeneous injection model as a mean to model the effects of the NGV cooling system on the main flow and compares the simulation to a second one with a fully resolved coolant system. The second part deals with simulations that extend over combustion chamber and high-pressure vanes and specifically addresses the impact of the flow field in the combustor on the high-pressure vanes. The main objective here is to better understand wall temperature distribution on the turbine blade wall which is obtained by use of higher order statistics analysis to highlight thermally critical areas. Based on such coupled multiple component LES, a discussion is initiated to identify a path allowing to take into consideration the impact of the combustion chamber on isolated high-pressure vane simulations using different reconstructed unsteady inlet conditions. %Finally, a LES of combustion chamber and entire single-staged high-pressure turbine is performed and compared against experimental data from the full annular FACTOR test rig located at DLR Göttingen. Compared to RANS predictions, the investigation of this rich unsteady LES data allows a more comprehensive study of the flow field yielding predictions closer to available experimental results than other simulations performed within the FACTOR project.



GICQUEL Laurent – Advisor – Institut National Polytechnique de Toulouse, France

ANDREINI Antoni – Referee – University of Florence, Italy

Mme SANJOSE Marlene – Referee – École de technologie supérieure, Canada

MOREAU Stephane – Member – Université de Sherbrooke, Canada

BRUEL Pascal – Member – Université de Pau et des Pays de l’Adour, France

GOURDAIN Nicolas – Member – ISAE Toulouse, France

DUCHAINE Florent – Invited member – Cerfacs, Toulouse France 

KOUPPER Charlie – Invited member-  Safran HE Bordes, France 


Thierry Poinsot officially entered the French Academy of Sciences

CERFACS |  8 November 2021

Thierry Poinsot officially entered the French Academy of Sciences on October 12. See presentation here :Read more

The AVBP code from CERFACS at the heart of for PRACE projects from the 23rd call

CERFACS |  30 September 2021

Cerfacs is involved in three PRACE projects of the 23rd call for which hour allocation runs from 01/10/2021 to 30/09/2022. Researchers from ECL/LMFA UMR5509 (Ecole Centrale de Lyon) and IMFT (UMR 5502) laboratories have earned projects entirely based on the use of the LES solver developed by Cerfacs AVBP and involve the support of experts from the CFD and COOP teams underling the importance and effectiveness of collaborations between French labs and Cerfacs. Alexis Giauque from ECL/LMFA UMR5509 (Ecole Centrale de Lyon) has obtained not only one but two PRACE projects! The first project LESFAN (RA0101, 30 000 000 CPU hours on Irene/Rome TGCC) is based on the use of AVBP in the turbomachinery version to study the generation of noise by a fan of a real airplane engine. The second, PRACE-EDGES (RA0101, 40 000 000 CPU hours on Irene/Rome TGCC) focuses on LES modeling of dens gas in complex geometries. To do so, the LMFA Team has developed advanced thermodynamic closures in AVBP allowing the direct simulation of such flows. Laurent Selle from IMFT (UMR 5502) has received CPU hours for the GASTON project (RA0061, 30 000 000 CPU hours on Marenostrum BSC) which aims to study the structure of hydrogen flames in porous materials. For this, IMFT and Cerfacs will perform coupled simulations considering the reactive flow with AVBP as well as the conduction in the porous medium with AVTP which is known to play an central role in the flame stabilization process. Carlos Perez Arroyo from IMFT (UMR 5502) received 16 Mh CPU hours on Joliot-Curie Skylake partition to support his project WONDER.Read more