Accession Number : AD0289520

Title :   MEASUREMENT OF PARTICLE SIZE IN A GAS-PARTICLE FLOW BY AN OPTICAL TRANSMISSION TEST

Corporate Author : ALLEGANY BALLISTICS LAB HERCULES POWDER CO CUMBERLAND MD

Personal Author(s) : DOBBINS,RICHARD A.

Report Date : OCT 1962

Pagination or Media Count : 1

Abstract : An experimental method of determining the volumeto-surface mean diameter, D32, in a gas-particle flow is described. The method involves the use of an experimental determination of optical transmission and the use of the primary dependence of the average scattering coefficient on D32. An error analysis was performed to show the manner in which errors propagate in the data reduction process. The optical depth due to particles produced in the gas-particle flow resulting from solid propellant rocket motors using metallic fuel additives was found to vary strongly with particle size. The theory is applied to experimental data recently published and the provisional results between actual D32 and the value yielded by transmission tests are considered very encouraging. Instrumentation is described to perform transmission tests on rocket exhaust gases where particles are strong emitters of thermal radiation and where the optical depth of the particle cloud is moderate. (Author)

Descriptors :   *GASES, *PARTICLES, ERRORS, EXHAUST GASES, FUEL ADDITIVES, METALLIC COMPOUNDS, OPTICS, OXIDES, ROCKET ENGINES, SCATTERING, THEORY, WAVE PROPAGATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE