Ramjet Fuel Studies. Part 1. Carbon.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1971
- Accession Number
- AD0886596
Entities
People
- G. W. Burdette
- Jacob T. Bryant
Organizations
- Naval Air Weapons Station China Lake