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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 En Línea: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v4.i1-6.830
pages 896-905

COMBUSTION PHENOMENA OF BORON CONTAINING PROPELLANTS

Wilhelm Eckl
Fraunhofer-Institut für Chemische Technologie (ICT) Joseph-von-Fraunhoferstr. 7,76327 Pfinztal 1 (Berghausen), Germany
Norbert Eisenreich
Fraunhofer Institut fur Chemische Technologie, Pfinztal, Germany
W. Liehmann
Fraunhofer-Institut für Chemische Technologie D-7507 Pfinztal, Germany
K. Menke
Fraunhofer-Institut für Chemische Technologie, Joseph-von-Fraunhofer-Str. 7, 76327 Pfinztal l (Berghausen), Germany
Th. Rohe
Fraunhofer-Institut für Chemische Technologie, Joseph-von-Fraunhofer-Str. 7, 76327 Pfinztal l(Berghausen), Germany
Volker Weiser
Fraunhofer Institut für Chemische Technologie, Pfinztal, 76327, Germany

SINOPSIS

The combustion of boron containing propellants, based on AP/GAP and AP/HMX/GAP formulations, have been investigated by applying fast spectroscopic, pyrometric and photographic techniques. The propellants burn at a rate of 17mm/s at 5 MPa. Addition of an iron oxide catalyst increased the rate to 20 mm/s at the same pressure. The determined average pressure exponents are 0.66 without and 0.57 with iron oxide as catalyst. At pressures higher than 5 MPa, a strong decrease in the exponent is observed. The reaction zones show high particle concentrations with temperatures from 1500 to 2000 K, varying with the nitrogen pressure. Reacting with air, the particle temperatures increase close to the evaporation temperature (2200 K) of boron oxide. The reaction of boron with oxygen is proved by the results of spectroscopic data. Considering an application in a ducted rocket, the boron is heated to the desired reaction temperature.


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