Accession Number : AD0886596
Title : Ramjet Fuel Studies. Part 1. Carbon.
Descriptive Note : Progress rept. Jul 69-Jul 70,
Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA
Personal Author(s) : Bryant, J. T. ; Burdette, G. W.
Report Date : JUL 1971
Pagination or Media Count : 71
Abstract : A convenient apparatus for dispersing uniform clouds of solid particles for laboratory dust-flame experiments has been tested. The combustion characteristics of premixed laminar graphite-oxygen-nitrogen flames, both with and without added hydrocarbon, have been studied at atmospheric pressure. The variation of particle burning time with initial oxygen partial pressure and oxygen/fuel ratio has been described by first-order combustion kinetics, with due consideration for oxygen depletion during burnout. Flame velocity measurements indicate very slow propagation of the above mixes when compared with that of hydrocarbon sprays and aluminum clouds of similar particle diameter and concentration. Added chlorine did not measurably affect graphite combustion up to concentrations of 2.5 vol. % in the presence of added hydrocarbon, but mixes of less than 0.8 vol. % of chlorine extinguished pure graphite-oxygen flames. The addition of 1.5 to 4.75 wt. % of lead acetate visibly stabilized the graphite-oxygen flame, but the effect on the flame velocity and burning rate could not be measured. Stable suspensions of 60 wt. % carbon black in various hydrocarbons have been prepared. The initial phases of the chemical and physical properties evaluation of these are reported. (Author)
Descriptors : *COMBUSTION), (*GRAPHITE, (*FUEL ADDITIVES, CARBON), (*RAMJET ENGINES, FUEL ADDITIVES), LABORATORY EQUIPMENT, FLAMES, REACTION KINETICS, CARBON, MIXTURES, CHLORINE, DUST, PARTICLE SIZE.
Subject Categories : Combustion and Ignition
Distribution Statement : APPROVED FOR PUBLIC RELEASE