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PhD Defense: Laure LABARRÈRE – Theoretical and numerical study of the isochore combustion applied to the case of the thermoréacteur

  Monday 21 March 2016 at 14h00

  Phd Thesis       Salle de conférence Jean-Claude André    

Abstract:
A major challenge for the aircraft industry is to improve engine efficiency and to reduce pollutant emissions for economic, technical and environmental reasons.
Aeronautical gas turbines have enjoyed a constant improvement for more than 60 years. This technology seems to have reached such efficiency levels that a technological breakthrough is necessary. Constant Volume Combustion (CVC) offers significant gain in consumption and could replace classical constant pressure combustion technologies, currently used in aeronautical engines. Mechanisms involved in isovolume combustion are not accurately controlled in the context of aeronautical chambers. Experimental, theoretical and numerical studies should provide a better understanding of CVC devices.

The objective of this thesis is to develop simulation tools to study the thermoreacteur concept. First, a zero-dimensional (0D) simulation tool is developed to describe the evolution of a CVC cycle. Models based on experimental correlations are used to build the 0D tool. Parameters have to be determined from numerical simulations.
Today, the 3D simulation of a CVC system is possible thanks to the recent progress of the LES (Large Eddy Simulation) methods developed at CERFACS. Simulations of the thermoreacteur concept have been carried out, and compared to experimental results obtained at the Pprime laboratory. Three operating points have been calculated.
The main conclusion is the existence of significant cyclic variations which are observed in the experiment and analyzed in the LES: the local flow velocity at spark timing and the level of residuals gases are the major factors leading to cyclic variations.

keywords : 
Constant Volume Combustion, Large Eddy Simulations, Turbulent Flames

Jury:
Thierry POINSOT (CERFACS) : Advisor

Antoine DAUPTAIN (CERFACS) : Co advisor

Philippe GUIBERT (Université Pierre et Marie CURIE – Paris) : referee

Stephane JAY (IFP Energies Nouvelles – Rueil-Malmaison) : referee

Marc BELLENOUE (ENSMA – Poitiers) : member

Pascal BRUEL (Université de PAU) : member
Ludovic DAUDOIS (COMAT Aerospace – Flourens) : industrial member

Luc HERRERO (COMAT Aerospace – Flourens) :  industrial member
Stephane RICHARD (TURBOMECA – Bordes) :  industrial member

CALENDAR

Monday

17

June

2024

Sparse Days Meeting 2024

From Monday 17 June 2024 to Tuesday 18 June 2024

  Cerfacs, Toulouse, France    

Tuesday

18

June

2024

🎓 PhD Defense: Nicola DETOMASO

Tuesday 18 June 2024From 14h00 at 18h00

  Phd Thesis       Cerfacs, JCA room, Toulouse, France    

Wednesday

19

June

2024

🎓 PhD Defense: Jean-Jacques HOK

Wednesday 19 June 2024From 14h00 at 18h00

  Phd Thesis       Cerfacs, JCA room, Toulouse, France    

ALL EVENTS