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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v2.i1-6.170
pages 303-331

ANALYSIS OF BORON PARTICLE IGNITION ABOVE A BURNING SOLID FUEL IN A HIGH-VELOCITY ENVIRONMENT

T. A. Jarymowycz
Department of Mechanical Engineering The Pennsylvania State University, USA
Vigor Yang
Department of Mechanical Engineering The Pennsylvania State University University Park, PA 16802, USA; School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

RESUMO

The ignition processes of boron particles above a burning solid fuel have been studied by numerical solution of a comprehensive theoretical model. The gas-phase formulation is based on the time-dependent multi-dimensional compressible Navier-Stokes equations and species transport equations. The particle-phase solution is obtained using a well-established boron particle ignition model. Boron particles are ejected from the surface of the burning fuel into a high-velocity crossflow and their trajectories are traced through the reacting flowfield using a Stochastic Separated Flow approach. The effects of particle size on their ignition time and location are determined. Results indicate that small particles (d < 3 μm) ignite as soon as they pass through the gas-phase reaction zone and come in contact with oxygen. Larger particles ignite further downstream, since they require more energy to remove their oxide layers and achieve thermal runaway. The effects of ambient conditions on the ignition times are also investigated. The study shows that minimization of ignition time can be accomplished by optimizing the environmental conditions during the ignition process.


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