Accession Number : AD0710747

Title :   COMBUSTION OF BORON PARTICLES AT ELEVATED PRESSURES,

Corporate Author : PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS

Personal Author(s) : Macek,Andrej ; Semple,J. McKenzie

Report Date : JUN 1970

Pagination or Media Count : 33

Abstract : 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 2000K; 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. It was shown that the classical theory of ignition and combustion can account for all three observed burning modes: metastable surface reaction during the preignition period, rapid self-sustained diffusion-combustion, and decaying combustion. Previously reported reaction-rate and ignition-limit data were used for quantitative estimates of parameters pertaining to the three regimes. (Author)

Descriptors :   (*COMBUSTION, *BORON), PARTICLE SIZE, HIGH PRESSURE, IGNITION, BURNING RATE, DIFFUSION, REACTION KINETICS

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE