Aluminum particle ignition in mixed environments

Salil Mohan, Edward L. Dreizin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

An experimental study of aluminum particle ignition in different oxidizing environments is reported. Aluminum particles in the μm size range are ignited by a CO2 laser in air, water vapor, carbon dioxide and mixtures of thereof. The particles are passing through the laser beam of fixed diameter at different velocities enabling experiments at varied heating rates and thus enabling one to determine the ignition kinetics. Ignition and combustion events are distinguished optically. Experiments are interpreted considering heat balance for a metal particle in a cold oxidizing environment. Experiments and estimates both show that achievement of a vapor phase flame around single Al particle is difficult in water vapor, when the adiabatic flame temperature is substantially lower than that in oxygenated environments. However, if the flame is established, the rate of reaction of aluminum in water is higher than that in other environments. Approximate Arrhenius-type descriptions for aluminum ignition in different oxidizing environments are proposed suitable for processes involving high heating rates of the order of 106-107 K/s.

Original languageEnglish (US)
Title of host publication47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479694
DOIs
StatePublished - 2009

Publication series

Name47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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