Treffer: Modèle CFD pour la combustion d'aluminothermites

Title:
Modèle CFD pour la combustion d'aluminothermites
Authors:
Pillemont, Lea, Estève, Alain, Simonin, Olivier, Bédat, Benoît, Rossi, Carole
Contributors:
Équipe Nano-ingénierie et intégration des oxydes métalliques et de leurs interfaces (LAAS-NEO), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Institut National des Sciences Appliquées (INSA)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Université Toulouse - Jean Jaurès (UT2J), Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Université Toulouse III - Paul Sabatier (UT3), Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Université Toulouse Capitole (UT Capitole), Communauté d'universités et établissements de Toulouse (Comue de Toulouse), ESA SSA-NEO Coordination Centre, Agence Spatiale Européenne = European Space Agency (ESA), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), CNRS, European Project: 832889
Source:
https://laas.hal.science/hal-04245310 ; CNRS. 2023.
Publisher Information:
CCSD
Publication Year:
2023
Collection:
HAL Université Côte d'Azur
Subject Terms:
CFD Computational Fluid Dynamics, Al, combustion, thermite, [PHYS]Physics [physics], [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment
Document Type:
Report report
Language:
French
Availability:
https://laas.hal.science/hal-04245310
https://laas.hal.science/hal-04245310v2/document
https://laas.hal.science/hal-04245310v2/file/Rapport_scientifiquePILLEMONT.pdf
Rights:
info:eu-repo/semantics/OpenAccess
Accession Number:
edsbas.3F6C412E
Database:
BASE

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National audience ; This manuscript deals with the combustion of nanothermites in a closed volume. A firststudy was focused on the combustion of aluminium particles with gaseous oxygen. Afterdetailed the reaction mechanisms implemented, the numerical integration of a combustioncode on PYTHON was done. To observe the main condensed and gaseous behaviors, afirst c ode c onsidered t he g as p hase a t e quilibrium. Then, a s econd a pproach consideringthe homogeneous gas kinetics with the Swihart and Catoire scheme reveals that, beyonda particle radius of 5 μm, the gas phase phase can be treated at equilibrium. This optimizationis considerable, as the equilibrium treatment is around 10 times faster than thehomogenous gas kinetics treatment.Then, a comparative study between the combustion of Al/CuO and Al/F e2O3 thermoteson manometric bomb was lead. A state of art, based on experimental publications,highligh the opposite behaviors of both thermites : Al/CuO thermite is known for its rapidcombustion and high gas release, whereas the Al/F e2O3 thermite is characterized by a slowreaction with little gas release. A numerical code developed on PYTHON for the Al/CuOthermite by a PhD student was adapted to the Al/F e2O3 thermite by calibrating thecoefficients (k0, Ea ) of the Arrhenius law, which governs the oxide decomposition. Experimentaldata, supplied by ArianeGroup and the University of Maryland, validate the ordersof magnitudes obtained numerically. However, experimental data reveal the decorrelationbewteen the temperature and pressure peaks, which is not reproduced by the numericalcode. As a result, a condensed-phase flow b etween a luminium a nd i ron o xide was implemented,using the Deal and Grove approach. The comparison between the characteristictime of this model and the characteristic time of the metal oxide decomposition highlighsthe key role of this condensed-phase flow in the combustion of Al/F e 2O3 thermite. ; Ce rapport s'intéresse à la combustion de nanothermites en enceinte fermée. Une première étude ...