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

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v2.i1-6.160
pages 287-302

COMBUSTION BEHAVIOR OF BORON CARBIDE FUEL IN SOLID FUEL RAMJETS

James A. Nabity
Naval Weapons Center, China Lake, USA
Tae-Ho Lee
Naval Postgraduate School, Monterey, USA
Benveniste Natan
Faculty of Aerospace Engineering, Technion − Israel Institute of Technology, Haifa 320003, Israel
David W. Netzer
Department of Aeronautics and Astronautics, Naval Postgraduate School, Monterey, USA

RÉSUMÉ

An experimental investigation was conducted to explore the effects of equivalence ratio and air mass flux on the combustion efficiency and particle size distributions in a solid fuel ramjet using a fuel grain highly loaded with boron carbide. Particle distributions were measured at the grain exit and at the nozzle entrance using a Malvern 2600 USD and at the nozzle throat using a collection probe. Combustion efficiency increased with increasing equivalence ratio (grain length) and decreasing air mass flux. In general, the particle distribution was trimodal or quadrimodal with mode peaks at approximately 4, 15, and 25 μm and possibly one at less than 2 μm. Probe measurements at the nozzle throat showed that considerable mass was contained in spherical particles smaller than 0.5 μm—outside the measurement range of the Malvern The larger particles were the result of surface agglomeration, primarily within the recirculation region. Short grains that consisted primarily of the recirculation region produced larger particles and lower combustion efficiencies. Higher inlet air temperatures produced higher combustion efficiencies, apparently the result of enhanced combustion of the larger boron carbide particles that burn in a diffusion controlled regime.


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