skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Combustion behavior of free boron-slurry droplets

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.

Authors:
; ;
Publication Date:
Research Org.:
Princeton Univ., NJ (USA). Dept. of Mechanical and Aerospace Engineering
OSTI Identifier:
6301092
Report Number(s):
AD-A-158620/5/XAB; MAE-1702
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; JET ENGINE FUELS; COMBUSTION; SLURRIES; BORON; DIFFUSION; FLAMES; FUELS; IGNITION; LUMINOSITY; OXIDATION; PARTICLES; PHOTOGRAPHY; REYNOLDS NUMBER; VERY HIGH TEMPERATURE; CHEMICAL REACTIONS; DISPERSIONS; ELEMENTS; MIXTURES; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; SEMIMETALS; SUSPENSIONS; THERMOCHEMICAL PROCESSES; 400800* - Combustion, Pyrolysis, & High-Temperature Chemistry

Citation Formats

Takahashi, F, Dryer, F L, and Williams, F A. Combustion behavior of free boron-slurry droplets. United States: N. p., 1985. Web.
Takahashi, F, Dryer, F L, & Williams, F A. Combustion behavior of free boron-slurry droplets. United States.
Takahashi, F, Dryer, F L, and Williams, F A. 1985. "Combustion behavior of free boron-slurry droplets". United States.
@article{osti_6301092,
title = {Combustion behavior of free boron-slurry droplets},
author = {Takahashi, F and Dryer, F L and Williams, F A},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6301092}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {5}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: