The location of the onset of rivulet formation in the surface-water flow over a wing with a NACA 4412 airfoil in rainfall rates of 50 mm/h - 160 mm/h is calculated and compared with wind-tunnel experiments. A model is presented in which rivulets form when the surface-tension shear stress between the liquid and the airfoil surface equals the interface shear stress caused by aerodynamic forces on the liquid due to air motion. Surfcae-tension shear stresses are obtained from measurements of surface tension and contact angle at the solid-water interface. Aerodynamic shear stresses are calculated by solution of Reynolds-averaged Navier-Stokes equations. Comparisons of calculated and measured locations of the onset of rivulet formation agreed within about 3 % of chord for wettable and nonwettable surfaces at incidence up to stall for Reynolds numbers of 2.5x105 to 4x105.


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    Titel :

    Rivulet formation in surface-water flow on an airfoil in rain


    Weitere Titelangaben:

    Rinnsalbildungen in der Oberflächenwasserströmung auf einem Tragflügel bei Regen


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 37 , 1 ; 45-49


    Erscheinungsdatum :

    1999


    Format / Umfang :

    5 Seiten, 6 Bilder, 21 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Rivulet Formation in Surface-Water Flow on an Airfoil in Rain

    Brian E. Thompson / Monica R. Marrochello | AIAA | 1999



    Surface wetting effects on a laminar flow airfoil in simulated heavy rain

    Hansman, R. J., Jr. / Barsotti, M. F. | NTRS | 1985


    Airfoil Performance in Heavy Rain

    Valentine, James R. | Online Contents | 1994