Abstract
Observations were made of the combustion properties of isolated droplets of both pure JP-10 and boron/JP-10 slurries in high-temperature, atmospheric-pressure, oxidizing gas streams. Droplets of initial diameter of 0.3–0.5 mm and solid mass fraction of 0–0.3 were projected downward into post-combustion gases of ca. 1900K and oxygen mole fraction of 0.07–0.39 under conditions of low Reynolds number (<2). The d-square law held for the combustion of JP-10 droplets, and the burning-rate constant was measured as a function of the oxygen mole fraction. Boron slurry droplets burned quiescently for short periods of time with an envelope flame of vaporized JP-10 but then experienced disruption. As the environmental oxygen content was increased, the disruption occurred more intensely and earlier, largely because of the increased diffusion-flame temperature; repeated disruptions were observed. For flame temperatures exceeding the boiling point of B2O3, boron particles emitted during disruption ignited. At low solid loading there was an initial stage during which the d-square law applied, followed by a stage of nearly constant diameter that terminated in disruption; at high solid loading only this second stage occurred.
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