Based on experimental results for a two-dimensional airfoil (NACA 64A006) with a sinusoidally-oscillating trailing-edge flap an illustration is given of typical effects occurring in high subsonic and transonic flow around oscillating airfoils and wings. It is shown that in this speed regime the unsteady airloads are influenced considerably by the interaction of the steady and unsteady flow fields. Moreover the periodical motion of the shock waves - if present - introduces relatively high local loads, which may contribute significantly to the overall unsteady forces and moments. In addition a review is given of available theoretical methods and it is tried to rate the practical value of some of the most advanced methods, which take into account both the effect of thickness and the effect of the oscillating shock waves.


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    Titel :

    High Subsonic and Transonic Effects in Unsteady Aerodynamics


    Beteiligte:
    H. Tijdeman (Autor:in)

    Erscheinungsdatum :

    1975


    Format / Umfang :

    65 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch