The report presents the results of an experimental investigation of the dynamic airloads on an airfoil (Vertol 23010-1.58) immersed in reverse flow such as occurs on the retreating side of a helicopter rotor disc in forward flight. Forces and moments in two-dimensional flow were determined from airfoil differential pressures measured during pitching oscillation, mach number, reynolds number, and mean angle-of-attack ranges corresponded to those typically encountered under full-scale flight conditions. Frequencies of oscillation were varied between values corresponding to the 1/rev and typical first elastic torsional frequency of rotor blades. Pitching oscillation was related to normal force and pitching moment stall at barious angles of attack.


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    Titel :

    Wind Tunnel Investigation of Airfoils Oscillating in Reverse Flow. Volume I. Summary and Evaluation of Results


    Beteiligte:
    L. Gray (Autor:in) / L. U. Dadone (Autor:in) / D. W. Gross (Autor:in) / R. F. Child (Autor:in)

    Erscheinungsdatum :

    1970


    Format / Umfang :

    90 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





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