An experimental investigation was conducted of the effect of pitching rate and pitching axis location on the aerodynamic loading of a two-dimensional airfoil during non-oscillatory pitching motion to a large angle of attack. The paper presents and interprets selected test results which are believed to be applicable to a helicopter blade experiencing dynamic stall. Rate of change of angle of attack is established as the dominant factor determining the very large peak lift and moment acting on the airfoil during the stall process. Pitching axis location has little effect on the peak loading, but substantial effect on the angle of attack at which dynamic stall occurs, suggesting that the loading is relatively independent of the dynamic stall angle. (Author)


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    Title :

    Dynamic Stall Considerations in Helicopter Rotors


    Contributors:
    N. D. Ham (author) / M. S. Garelick (author)

    Publication date :

    1968


    Size :

    9 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Dynamic stall considerations in helicopter rotors

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




    Investigations of dynamic stall and dynamic stall control on helicopter airfoils

    Gardner, Anthony D. / Technische Universität Clausthal | TIBKAT | 2015

    Free access

    Investigations of dynamic stall and dynamic stall control on helicopter airfoils

    Gardner, Anthony D. / Technische Universität Clausthal | TIBKAT | 2016