Etude du couplage flamme non-prémélangée / phase condensée par simulation numérique avancée

Study of the non-premixed flame / condensed phase coupling by advanced numerical simulation

• Auteur / Autrice : Raghavendran Raman
• Direction : Fabien Halter, Guillaume Legros
• Type : Projet de thèse
• Discipline(s) : Energétique
• Date : Inscription en doctorat le 01/10/2021
• Etablissement(s) : Orléans
• Ecole(s) doctorale(s) : Energie, Matériaux, Sciences de la Terre et de l'Univers - EMSTU
• Partenaire(s) de recherche : Laboratoire : ICARE - Institut de Combustion, Aérothermique, Réactivité, Environnement

Mots clés

Mots clés libres

Simulation numérique

Écoulement multiphasique

Flamme

Numerical simulation

Flame

Multiphase flow

Résumé

The main objective driving the current projects dealing with spacecraft fire safety is to create a comprehensive data set to enable a suitable paradigm for fire safety in spacecraft. To face this challenge, within the context of the future manned mission to Mars, a topical team gathering experts from the main space agencies has worked on the definition of a complete series of demonstration and validation experiments. The French contribution, lead by Dr. Guillaume Legros, focuses on the configuration illustrated in [1], i.e. a flame spreading in microgravity over the polyethylene coating of an electrical wire in an opposed laminar flow. Due to the intense heating by the flame, the coating melts. While at normal gravity this leads to dripping, capillarity effects are revealed in microgravity, resulting in the formation of a persistent bulb. The exposure of the burning bulb to the radiative flux from the flame is then significant and may enhance the flame spread. Simulating the coupling between the flame and the burning bulb is a challenging multiphase problem that requires extended studies. Within the context of this Ph.D. project, the student will develop a numerical tool, i.e. basilisk code, developed by Dr. Stéphane Zaleski at Sorbonne University [2]. This DNS tool is expected to enable the simulation of the condensed phase and more specifically the coupling of its topology to the flame. The intense heating of the condensed phase will be paid particular attention as it especially requires the incorporation of a sophisticated radiative heat transfer model, such as those developed by Dr. Jean-Louis Consalvi at Aix-Marseille University [3]. More academic still very similar configurations are experimentally investigated at ICARE-CNRS in Orléans. As an illustration, the combustion of a single metallic particle has been documented for a few years. This kind of configuration will serve as an intermediate still synergetic step towards the ultimate goal of this PhD project. References [1] A. Guibaud, J.-M. Citerne, J.-L. Consalvi, O. Fujita, J.L. Torero, G. Legros, Fire Technol. 56, p.185-207, 2020. [2] G. Tryggvason, R. Scardovelli, S. Zaleski, Direct numerical simulations of gas–liquid multiphase flows, Cambridge University Press, 2011. [3] A. Guibaud, J.-L. Consalvi, J.-M. Citerne, G. Legros, Comb. Flame 222, p.530-543, 2020.