Experimental characterization of combustion regimes for micron-sized aluminum powders

Autor: Olivier Guézet, Christian Chauveau, Christine Mounaïm-Rousselle, Toni Tahtouh, Philippe Gillard, Stephane Bernard, Fabien Halter, Ricardo Lomba
Přispěvatelé: Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS)-Université d'Orléans (UO), PSA Peugeot Citroën (PSA)
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: 53rd AIAA Aerospace Sciences Meeting
53rd AIAA Aerospace Sciences Meeting, Jan 2015, Kissimmee, United States. ⟨10.2514/6.2015-0925⟩
Popis: International audience; This work presents an experimental study of combustion characteristics of micron-sized aluminum particles in the transition regime under constant volume combustion experiments. Burning velocities were estimated from the measured pressure traces using both a simplified model for aerosol combustion on closed spherical bombs and a semi-empirical correlation, and compared to previous literature. Flame temperatures were measured by bi-color pyrometry and indicate that for particles smaller than 12 m, the flame moves closer to the particle's surface, since flame temperatures were close to aluminum boiling point. For 17:9 µm particles, flame temperatures were close to predicted adiabatic flame temperature and alumina vaporization-dissociation temperature, indicating a classical vapor phase flame under a diffusion-controlled mechanism. However, spectroscopy measurements did not detect significant reductions on molecular AlO emissions for ner particles. This indicates a still very significant presence of vapor phase reaction for powders with a Sauter mean diameter at least as large as 7 µm, which is further supported by the presence of nanometric spheres in the combustion residues, since alumina formed under a vapor phase reaction is expected to condensate into nanometric droplets.
Databáze: OpenAIRE