Gasification of Boron Oxide Drops and Boron Slurry Agglomerates in Combustion Gases,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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The behavior of boron oxide drops as well as agglomerates of boron particles, which are formed during the combustion of boron slurry fuels, was studied in the post flame region of a flat-flame burner. Individual particles having initial diameters of 150-800 microns were supported on a probe and could be rapidly placed in the gas environment. Measurements were made of the variation of particle electron microscope. Burner operating conditions were varied to give fuel equivalence ratios in the range 0.3-0.7 and gas temperatures in the range 1500-1975 K at atmospheric pressure. Flame environments both with and without water vapor present were considered. Results show that boron oxide gasification is a relatively slow process with 1000 micron initial diameter drop lifetimes ranging from two minutes to two hours. The presence of water vapor speeds gasification, as suggested by King, and probably accounts for the shorter ignition delays observed for the oxidation of boron particles in wet environments.