Abstract
A detailed model of boron-oxygen-nitrogen dust-cloud flames including consideration of the details of boron particle ignition and the effects of oxygen depletion has been developed and used for prediction of flame speeds as functions of numerous parameters. Reasonably good agreement between measured flame speeds for the only two data points available on laminar boron dust cloud combustion and those predicted by this model has been obtained, although uncertainty concerning details of the experimental parameters results in this agreement being somewhat inconclusive. In addition, a simplified closed-form flame speed expression has been developed and the effects on predicted flame speeds of the various assumptions used in its development have been examined. The models have been used to study the effects of initial temperature, pressure, initial oxygen mole fraction, weight fraction particles, initial particle size, initial thickness of the oxide coating on the particles, radiation feedback from the postflame zone, and Nusselt Number. Mechanisms leading to the predicted dependencies are discussed.
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