The primary objectives of this study were to obtain the necessary data and develop a calculation procedure that would facilitate predicting the atmospheric-helium contribution to the drag of a satellite having a predominantly convex exterior. Molecular-beam techniques were used to measure, for several incidence angles, the spatial and energy distributions of 7000 m/s helium atoms scattered from a 6061-T6 aluminum plate and an anodized 1235-0 aluminum surface. From these measured distributions, tangential and normal momentum accommodation coefficients were calculated as functions of incidence angle. Using these calculated accomodation coefficients, one can predict drag coefficients for satellites having predominantly convex exteriors. For spherical satellites, drag coefficients of 2.64 and 2.62 were predicted for the subject surfaces. (Jensen)


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    Titel :

    Satellite drag coefficients calculated from measured distributions of reflected helium atoms


    Weitere Titelangaben:

    Berechnung von Widerstandsbeiwerten bei Satelliten aus den Messwerten fuer die Verteilung reflektierter Heliumatome


    Beteiligte:
    Liu, S.M. (Autor:in) / Sharma, P.K. (Autor:in) / Knuth (Autor:in)

    Erschienen in:

    AIAA Journal ; 17 , 12 ; 1314-1319


    Erscheinungsdatum :

    1979


    Format / Umfang :

    6 Seiten, 6 Bilder, 1 Tabelle, 15 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch






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