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Numerical study of ignition and light-around process in aeronautical gas turbines.

Event Type: 
Date and Time: 
Friday, July 24, 2015 - 16:00
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Dr. Lucas Esclapez, CTR Postdoctoral Fellow

For safety reasons, in-flight relight of the engine must be guaranteed over a wide range of operating conditions but the increasing stringency of pollutant emission constraints requires the development of new aero-engine combustor whose design might be detrimental to the ignition capability. To improve the knowledge of the ignition process in aeronautical gas turbines and better combine conflicting technological solutions, current research relies on both complex experimental investigations and high fidelity numerical simulations. Numerical study of the ignition process in gas turbines from the energy deposit to the light-around is performed with several objectives: increase the level of confidence of Large Eddy Simulations tool for the analysis of the ignition process, investigate the mechanisms controlling ignition in conditions representative of realistic aeronautical gas turbine flows and improve the low-order methodologies for the prediction of ignition performance. In a first part, LES of the single burner installed at CORIA (France) is carried out and allows to highlight the LES accuracy and to build a database on which the main mechanisms controlling the ignition success are identified. Based on these results, a methodology is developed to predict the ignition performance at a low computational cost using the non-reacting flow statistics only. In a second part, the light-around is studied and the LES is showed to predict accurately the ignition process. LES results are then used, jointly with experiments, to analyse the mechanisms driving the flame propagation.

Dr. Lucas Esclapez just received his PhD. conducted at CERFACS from Institut National Polytechnique of Toulouse (France). His research focuses Large-Eddy Simulation (LES) of the ignition process in gas turbines in a massively parrallel environment and the develoment of a reduced model for the prediction of ignition performances. This work has led to an extensive experience in LES of turbulent reacting flow and development of scientific code (C++/Fortran/MPI) in supercomputing context.