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Combustion of Boron Particles at Elevated Pressures by Andrej Maček; J. McKenzie Semple is a Engineering article available to read on EtoBox.

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Combustion of single boron particles, about 75 microns in diameter, from a crystalline powder sample has been studied. Particles were ignited by being dropped through a focused laser beam in several oxidizing gases over a range of pressures. In pure oxygen, in air, and in O2/Ar (20/80), particles were merely preheated to a temperature about 2000~ ignition took place spontaneously after a measurable induction period. Quantitative values of both the induction period and the subsequent self-sustained combustion period are listed. In air and in the O2/Ar mixture, the burning times decrease from about 45 msec to about 20 msee as the pressure is increased from 1 to 35 arm. In pure 02 at atmospheric pressure, the total burning time is only 6.8 msec. In pure COs and in O2/N2 (7/93), there is no induction period, no selfignition, and no steady-state combustion; particles must be brought to a burning regime by an external energy flux, and they are able to maintain that regime for only a limited time before extinguishment. It is shown that the classical theory of ignition and combustion can account for all three observed burning modes: metastable surface reaction during the pre-ignition perio

Who reads Combustion of Boron Particles at Elevated Pressures?

Author

Andrej Maček; J. McKenzie Semple

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd; Elsevier BV (ISSN 1540-7489)

Published

1971

Language

EN

Field

Engineering (Physical Sciences)