Cerfacs Enter the world of high performance ...

The 21 March 2016 at 14h00

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

ROGEL |  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

NEWS

Two CERFACS proposals accepted in PRACE 14th call

superadmin |  4 April 2017

Two CERFACS proposals have been accepted at the last PRACE call. The two studies will be performed with the AVBP solver and will address two very different topics: "Large Eddy Simulation of the Deflagration to Detonation Transition » (in collaboration with TOTAL) will focus on explosions in...Read more


Articles of scientific mediation in the online journal “The Conversation”

thual |  31 March 2017

Among the missions of the researchers and engineers of Cerfacs is the dissemination of scientific results at all levels, from specialized scientific journals to media intended for the general public. In this spirit, Cerfacs has chosen the online journal "The Conversation" to publish several...Read more

ALL NEWS