This report first summarizes the works carried out on unsteady effects in droplet evaporation and combustion and on the behaviour of hydrazine catalytic thrusters working under steady state conditions. A topic that is presented in more detail, is on the influence of the temperatures of liquid hydrazine and catalyst particle temperatures on the vacuum start characteristics of a reactor. The model used assumes the existence of a liquid front that first advances towards the interior of the catalyst particle by porous action and then recedes towards the exterior. An order of magnitude estimate seems to indicate that during the process, convective heat transfer dominates over conduction, and the analysis shows the existence of a thin thermal front, whose structure is calculated. Then, the liquid penetration is only governed by the initial particle temperature. For low enough initial particle temperatures the thermal front structure reaches the liquid front and the liquid penetration is also influenced by the initial hydrazine temperature.


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    Title :

    Combustion and flame propagation in heterogeneous systems


    Additional title:

    Verbrennung und Flammausbreitung in eimem heterogenen System


    Contributors:
    Crespo, A. (author)

    Published in:

    Publication date :

    1976


    Size :

    24 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English





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