Theoretical predictions based on the marching technique are compared with experimental observations on an airfoil with a concave region. Theoretical predictions of the wavelength of the most amplified Goertler vortex are in excellent agreement with the experimental observations for the range of chord Reynolds numbers from 1.0 to 3.67 million. In the convex zone, solutions from the marching technique showed that the initial counter-rotating vortex pairs lift off the surface and dissipate while another layer of vortex pairs of opposite rotation develops near the surface. This confirms the experimentally observed double peaked streamwise velocity perturbations. Furthermore, the streamwise velocity perturbations which dominate spanwise variation in the surface shear stress distribution shift by half a wavelength in the convex region. The experimental flow visualization photographs clearly confirm this phenomena.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Goertler instability on an airfoil: Comparison of marching solution with experimental observations


    Weitere Titelangaben:

    Die Goertler Instabilitaet auf einem Tragfluegel: Vergleich einer schrittweisen Loesung mit experimentellen Beobachtungen


    Beteiligte:
    Kalburgi, V. (Autor:in) / Mangalam, S.M. (Autor:in) / Degenhart, J.R. (Autor:in)


    Erscheinungsdatum :

    1989


    Format / Umfang :

    16 Seiten, 25 Bilder, 35 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Comparing local and marching analyses of Goertler instability

    DAY, H. P. / HERBERT, T. / SARIC, W. S. | AIAA | 1990


    The Goertler Instability on an Airfoil

    Mangalam, S. M. / Dagenhart, J. R. / Hepner, T. E. et al. | NTRS | 1985


    The Goertler instability on an airfoil

    MANGALAM, S. / DAGENHART, J.R. / MEYERS, J. et al. | AIAA | 1985



    Goertler instability of wall jets

    FLORYAN, J. M. | AIAA | 1989