The interaction of oscillations of the mean velocity of the relative flow with the periodic changes in angle of attack that are produced in the forward flight of helicopters on the airfoil profiles of the rotors has been investigated for the first time. The study conducted in the IIT 2 ft x 2 ft oscillating flow wind tunnel coupled with visual observations in a small water tunnel has revealed that the aerodynamic characteristics of oscillating flows in steady flow, documented by a number of investigators, may be altered significantly when oscillations of the flow velocity are superimposed on those of the angle of attack of the airfoil. (Author)


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    Titel :

    Studies of the Dynamic Stall or Airfoil Profiles for Helicopter Rotors


    Beteiligte:
    A. A. Fejer (Autor:in)

    Erscheinungsdatum :

    1979


    Format / Umfang :

    15 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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    Ham, N.D. / Garelick, M.S. | Engineering Index Backfile | 1968


    Dynamic Stall Considerations in Helicopter Rotors

    N. D. Ham / M. S. Garelick | NTIS | 1968



    Oscillating Airfoil Compressible Dynamic Stall Studies

    Chandrasekhara, M. S. / Indian Institute of Science; Department of Aerospace Engineering | British Library Conference Proceedings | 1993