Ignition of Aluminum Slurry Droplets

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Abstract
The ignition of aluminum slurry fuel droplets was studied in the post-flame region of a flat-flame burner. Individual droplets having initial diameters ranging from 500 to 1100 microns were supported on silicon carbide filaments and rapidly exposed to a hot gas environment. Burner operating conditions were varied to provide oxygen mole fractions ranging from 0.10 to 0.25 and gas temperatures from 1250 to 1800 K at atmospheric pressure. Flame environments both with and without water vapor were considered. Using motion picture photography, ignition times were measured and ignition limits were determined. Experiments showed that AI/JP-10 slurry droplets ignited at ambient gas temperatures higher than 1300-1450 K within 0.2-1.2 s. The ignition processes of JP-10 bun -off and agglomerate heat-up were modeled analytically, and the theoretical predictions of ignition times were compared with experimental data. Ignition limits also were studied analytically. In both cases, theoretical calculations and experimental data were in good agreement.

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