PhD defense - E. Collado Morata

Delivered by Université de Toulouse - MEGeP
Speciality: Energy and Transfers


October 29, 2012 - CERFACS

This PhD dissertation, conducted as part of a CIFRE research project between TURBOMECA and CERFACS, deals with improving performance of axial turbines from helicopter engines. One of the main difficulties with such an objective is the control of the temperature prediction around the blades, especially the temperature of the high pressure rotor. The work of this thesis focusses on two axes: First concerns the analysis of Large Eddy Simulation (LES) predictions around blades: a numerical LES approach on unstructured meshes is compared to Reynolds Averaged Navier-Stokes (RANS) results on structured meshes as well as to LES on structured meshes. LES on unstructured meshes demonstrates its capacity of taking into account the phenomena which have an impact on wall heat flux around blades. The second axis deals with the development of a numerical tool for coupling and transferring information between a reactive LES code, used in combustion chambers, and a non-reactive RANS solver, employed by industrial actors for modeling the turbine stage. This tool is validated on a number of test cases which show the potential of this methodology for multi-component predictions. In addition, this coupling procedure is the first step towards the numerical simulation of a whole engine.

S. Moreau	Université de Sherbrooke (Canada)	Referee
E. Van der Weide	University of Twente (The Nederlands)	Referee
I. Trébinjac	Ecole Centrale de Lyon LMFA	Member
B. Nkonga	ENSEIRB-MATMECA Bordeaux	Member
L. Pons	Turbomeca Bordes	Invited member
M. Dumas	Snecma Villaroche	Invited member
N. Gourdain	CERFACS - CFD	Co-advisor
L.Y.M. Gicquel	CERFACS - CFD	Advisor

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