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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.2019027996
pages 217-228

DECOMPOSITION AND OXIDATION PHENOMENA OF GELLED NITROMETHANE-BASED MONOPROPELLANTS

Dominic Freudenmann
German Aerospace Center (DLR), Lampoldshausen, 74239 Hardthausen, Germany
Nicole Röcke
German Aerospace Center, Hardthausen, 74239, Germany
Christoph U. Kirchberger
German Aerospace Center (DLR), Lampoldshausen, 74239 Hardthausen, Germany
Helmut K. Ciezki
German Aerospace Center (DLR), Institute of Space Propulsion, 74239 Hardthausen, Germany
Stefan Schlechtriem
German Aerospace Center (DLR), Institute of Space Propulsion, Hardthausen, 74239, Germany

RÉSUMÉ

For decades, experimental propulsion systems based on gelled mono- or bipropellants have been established and tested. Detailed knowledge on early combustion and subsequent decomposition processes of gel-like propellants are still poorly understood and, beyond this, highly system specific. Within this work, nitromethane was gelled in experimental approaches with the help of inorganic and organic thickening agents. The prepared gels were thermally examined under inert and oxidative conditions. Results revealed a time-delayed influence on the decomposition and evaporation behavior of nitromethane-based gels depending on the agents used. Under the given experimental conditions, evaporation of nitromethane at medium temperatures was observed in all cases, indicating weak liquid-gelling agent interactions. Moreover, crucible remnants are spectroscopically characterized and revealed thermite-like reactions within metallized reaction mixtures at higher temperatures.


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