MMH (Monomethylhydrazine) is a propellant extensively used as a fuel for spacecraft and rockets. Nowadays, it is used in association with NTO (nitrogen tetroxide) for the propulsion of numerous satellites. Several recent publications showed that MMH is under consideration, mostly associated with NTO or O2, for various projects. In the literature, no information is available on the ignition delays of MMH + O2 + N2. In a more general way, most ignition delay studies are carried out with argon as diluent. The effect of additives on MMH oxidation has never been studied. The major objectives of this study are to provide experimental kinetic data for MMH + O2 + Ar mixtures in various conditions and to suggest a detailed kinetic model of MMH oxidation with and without additives. Ignition delays have been investigated for mixtures of MMH + O2 + Ar at high temperatures (850 K to 1440 K) in the pressure range from 160 kPa to 400 kPa, for equivalence ratios of 1 to 4.3 and in the Ar dilution range from 82 mole-% to 96 mole-%. The replacement of argon by nitrogen leads to a twofold increase of the delay. The addition of 0.88 mole-% to 2.4 mole-% hydrogen to the MMH + O2 + Ar mixture shows that hydrogen has, globally, a promoting effect on the ignition in MMH + O2 + (Ar). Moreover, it is shown, with the help of a kinetic model that the addition of MMH by forming radicals during its oxidative decomposition promotes hydrogen oxidation in the temperature range from 900 K to 1000 K.


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    Titel :

    Shock tube study of the effect of nitrogen or hydrogen on ignition delays in mixtures of monomethylhydrazine + oxygen + argon


    Weitere Titelangaben:

    Untersuchungen zum Einfluß von Stickstoff oder Wasserstoff auf den Zündverzug in Monomethylhydrazin-Sauerstoff-Argon-Gemischen in einem Stoßwellenrohr


    Beteiligte:
    Catoire, L. (Autor:in) / Bassin, X. (Autor:in) / Ingignoli, W. (Autor:in) / Dupre, G. (Autor:in) / Paillard, C. (Autor:in)

    Erschienen in:

    Combustion and Flame ; 109 , 1/2 ; 37-42


    Erscheinungsdatum :

    1997


    Format / Umfang :

    6 Seiten, 2 Bilder, 2 Tabellen, 25 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch