Accession Number : ADA158620


Title :   Combustion Behavior of Free Boron Slurry Droplets,


Corporate Author : PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING


Personal Author(s) : Takahashi,F ; Dryer,F L ; Williams,F A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a158620.pdf


Report Date : 01 May 1985


Pagination or Media Count : 27


Abstract : This paper reports first observations of the combustion properties of isolated boron/JP-10 slurry droplets in high temperature, atmospheric pressure oxidizing streams under low Reynolds number conditions. Slurry droplets of initial diameter between 400 and 500 micrometers and initial solid mass fraction of 0.3 were studied using single-lens reflex and high speed cine photography under both self illuminated and backlighted conditions. Boron slurry droplets burned for short periods of time with an envelope diffusion flame structure, but then experienced violent disruption for all cases studied. The intensity of the disruption progress was found to be strongly influenced by the temperature of the envelope diffusion flame. The ignition of the boron particles emitted from the initial fuel droplet was also affected by this flame temperature. As this flame temperature was increased by increasing the environmental oxygen content, the disruption occurred at earlier times in the vapor phase burning period. Ignition of the boron particles at high flame temperatures ( 2500K) was accompanied by a popping sound and a bright greenish flash of luminosity.


Descriptors :   *COMBUSTION , *SLURRY FUELS , *BORON , *JET ENGINE FUELS , LUMINOSITY , TEMPERATURE , STRUCTURAL PROPERTIES , HIGH TEMPERATURE , HIGH VELOCITY , OBSERVATION , INTENSITY , ILLUMINATION , SHORT RANGE(TIME) , FUELS , SLURRIES , PARTICLES , OXIDATION , DROPS , PHOTOGRAPHY , IGNITION , DIFFUSION , FLAMES , BAROMETRIC PRESSURE , LOW RATE , REYNOLDS NUMBER , ENVELOPE(SPACE) , STREAMS , FLASHES


Subject Categories : Combustion and Ignition
      Fuels


Distribution Statement : APPROVED FOR PUBLIC RELEASE