Accession Number : ADA195176

Title :   Descriptive Characterization of Propellant Particles.

Descriptive Note : Final rept. Oct 84-Oct 87,

Corporate Author : AIR FORCE ASTRONAUTICS LAB EDWARDS AFB CA

Personal Author(s) : Chandler, Kurt G.

Report Date : APR 1988

Pagination or Media Count : 28

Abstract : Particle characterization is used for burn rate and rheology predictions for solid rocket propellants. This report compares the burn rate of solid rocket propellants to various measurement techniques to determine the best routine characterization parameter for burn rate predictions. These measurement techniques include surface area measurements, diameter measurements from ensemble light scattering, light blocking, sieving techniques, and a new particle solvolysis technique. The diameter techniques also provided data for surface area calculations. Propellants containing HMX, AP, and AN were burned in a window bomb at pressures ranging from 500 psig to 2000 psig. The results indicate a volume dependent process for HMX burning, a surface area dependent process for AN, and a surface area dependent process affected by the particle distribution for AP. For burn rate prediction, routine measurements of weight median diameters are recommended for HMX, surface area measurements or ensemble light scattering weight median diameters are recommended for AP, and surface area measurements are recommended for AN. Keywords: Particle characterization, Burn rate predictions, Measurement techniques, HMX, AP, AN, Solid rocket propellants, Window bomb.

Descriptors :   *BURNING RATE, *SOLID ROCKET PROPELLANTS, *PROPELLANT GRAINS, BLOCKING, BOMBS, DISTRIBUTION, HMX, LIGHT, LIGHT SCATTERING, LIGHTWEIGHT, MEASUREMENT, METHODOLOGY, PARTICLES, PREDICTIONS, PROPELLANTS, SOLVOLYSIS, SURFACES, VOLUME, WEIGHT, WINDOWS, AMMONIUM PERCHLORATE, AMMONIUM NITRATE.

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE