Ignition and Global Combustion Models for Clouds of Boron Particles

It is shown that the single particle ignition model proposed by King (1972) for the ignition of boron particles can be modified and extended to predict with reasonable accuracy the ignition delay times of single boron particles exposed to an oxidizing atmosphere. Provisions were also included to acc...

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Veröffentlicht in:AIAA journal 1974-01, Vol.12 (1), p.71-77
Hauptverfasser: MEESE, R. A., SKIFSTAD, J. G.
Format: Artikel
Sprache:eng
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Zusammenfassung:It is shown that the single particle ignition model proposed by King (1972) for the ignition of boron particles can be modified and extended to predict with reasonable accuracy the ignition delay times of single boron particles exposed to an oxidizing atmosphere. Provisions were also included to account for the effect of changes in system pressure, particle diameter, surrounding gas temperature, and the mole fraction of water vapor in the gas. The single particle ignition model is extended to clouds of particles by attempting to account for such factors as interparticle radiation and the finite amount of gas surrounding each particle. This model predicted ignition of particle clouds under certain conditions which would not favor the ignition of single particles. Finally, a global combustion rate is derived for a cloud of boron particles burning under steady-state conditions. This combustion rate was obtained from an analysis of the data obtained from a series of experimental runs performed in a one-dimensional flow reactor.
ISSN:0001-1452
1533-385X
DOI:10.2514/3.49155