Coupled heat transfer and LES in combustion chambers: application to the prediction of the exit temperature (FRT)
Computational Fluid Dynamics - Combustion
Required Education / Niveau requis
From / Date de début
Duration / Durée
Context / Contexte
One key point in aeronautical combustion chamber design is the control of the temperature at the exit of the chamber (FRT), to avoid the occurrence of hot points which could damage the turbine blades placed downstream. In such systems combustion products are cooled by dilution jets to a mean temperature below the acceptable treshold for the turbine. The homogeneity of the exit temperature is strongly linked to the quality of the turbulent mixing with the cold jets, and large eddy simulation (LES) is a powerfull tool to study this process [1-4]. However the exit temperature is also linked to the wall heat losses and to thermal radiation (in particular by soot), which are much less known and understood. Finally, the computation of absolute exit temperature fields (and not only their deviation to the mean) requires accurate thermochemistry which is not an easy task for a complex fuel like kerosene.
Description / Description
It is proposed in this work to take into account thermal and thermochemical effects in the prediction of FRT with LES, and to compare these calculations to the current state of the art (N3S computations). To reach this objective, coupled simulations Fluid-Heat transfer (including radiation) will be set up and run with the codes AVBP (fluid), AVTP (heat transfer in solids) and PRISSMA (radiation) developed at CERFACS, and coupled in PALM. All these codes already exist and have been coupled, so that code developments in the framework will mainly concern the coupling technique and possibly the improvement of wall treatment where heat transfer models are still a difficulty in LES. Computations will be performed on an industrial configuration proposed by Turbomeca. The analysis of the results will give new information on the role of heat transfer on the FRT and allow to evaluate the improvement of the quality of the prediction brought by coupled simulations. The efficiency of such tools will be compared to existing methods at TM. The methodology will be also well adapted to the study of wall temperature.
 G. Boudier, L.Y.M. Gicquel, T. Poinsot, D. Bissières and C. Bérat. Les predictions and validations of the exit temperature profiles in an industrial combustion chamber. In 1st Workshop INCA, pages 113-120, SNECMA, Villaroche, France, 2005.
 G. Boudier, L.Y.M. Gicquel and T. Poinsot. Effects of mesh resolution on large eddy simulation of reacting flows in complex geometry combustors. Combustion and Flame, 155:196-214, 2008.
 G. Boudier, L.Y.M. Gicquel, T. Poinsot, D. Bissières and C. Bérat. Comparison of LES, RANS and experiments in an aeronautical gas turbine combustion chamber. Proc. of the Combustion Institute, 31(2):3075-3082, 2007.
 P. Moin and S. V. Apte, Large-eddy simulation of realistic gas turbine combustors, AIAA Journal, 44(4) : 698-708, 2006.
Contacts / Contacts
Name: Poinsot Thierry
Name: Cuenot Bénédicte
Phone: 05 61 19 30 44
Fax: 05 61 19 30 00
Salary / Rémunération