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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2018027988
pages 111-124

DETAILED ANALYSIS OF COMBUSTION PROCESS OF A SINGLE ALUMINUM PARTICLE IN AIR USING AN IMPROVED EXPERIMENTAL APPROACH

Alexandre Braconnier
ArianeGroup, CRB, 9 rue Lavoisier, 91710 Vert-Le-Petit, France; ICARE-CNRS, 1C Avenue de la Recherche Scientifique 45071 Orléans Cedex, France
Christian Chauveau
CNRS - INSIS, Institut de Combustion, Aérothermique, Réactivité, Environnement, 1C Avenue de la Recherche Scientifique, 45100 Orléans, France
Fabien Halter
ICARE-CNRS, 1C Avenue de la Recherche Scientifique 45071 Orléans Cedex, France
Stany Gallier
ArianeGroup, CRB, 9 rue Lavoisier, 91710 Vert-Le-Petit, France

ABSTRACT

The current experimental study aims at analyzing the self-sustained combustion of 30–120 μm Al particles using an electrostatic levitation system. In this improved set-up, a single particle is isolated in air with different ambient pressure (1–31 bar) to be then ignited by a CO2 laser beam. The integrated optical signature of burning Al particle is recorded using filtered photomultipliers and a high-speed camera. The photomultiplier is used to estimate burning time while the camera direct visualization allows to measure the evolution of combustion parameters in real time such as droplet diameter (including initial particle diameter) and flame diameter with important resolution. Important information are also provided to accurately describe combustion phenomenology. Measured burning times according to the pressure are compared to experimental correlations issued from literature and similar trends are observed. The existence of different stages during combustion is clearly evidenced and early assumptions can be made to explain dependence between combustion time and identified phenomena.


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