Accession Number : AD0744282

Title :   Combustion of Boron Particles: Experiment and Theory,

Corporate Author : PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS

Personal Author(s) : Macek,Andrej

Report Date : MAY 1962

Pagination or Media Count : 33

Abstract : The primary purpose of the work was measurement of burning times of single boron particles as functions of three experimental variables: particle diameter d from 37 to 124 micrometers, pressure P from 0.17 to 35.0 atm, and mole fraction of oxygen in gas X from 0.1 to 1.0. Limited studies were also made in fluorine-containing gases without oxygen. The experiments were done by a previously described laser-ignition technique. In oxygen-containing gases measurable pre-ignition delays were observed, except at low pressures; they were not observed in the absence of oxygen. The effect of convection in these free-fall experiments was found to be significant at large values of d and P, and had to be taken into account in interpretation of the data. When d, P, and X are sufficiently high, the burning times are found to be inversely proportional to X, directly proportional to d squared, and independent of P. At low values of these parameters, burning times deviate from these scaling laws. (Author)

Descriptors :   (*BORON COMPOUNDS, COMBUSTION), (*SOLID ROCKET PROPELLANTS, BORON COMPOUNDS), PARTICLE SIZE, BURNING RATE, IGNITION LAG, CHEMICAL REACTIONS, EXPERIMENTAL DATA, THEORY

Subject Categories : Combustion and Ignition
      Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE