ABSTRACT Skin frictional drag reduction efficiency of “stiff” compliant coating was investigated in a wind tunnel experiment. Flat plate compliant coating inserts were installed in a wind tunnel and the measurements of skin frictional drag and velocity field were carried out. The compliant coatings with varying viscoelastic properties had been prepared using different composition. In order to optimize the coating thickness, the most important design parameter, the dynamic viscoelastic properties had been determined experimentally. The aging of the materials (variation of their properties) during half a year was documented as well. A design procedure proposed by Kulik et al. (2008) was applied to get an optimal value for the coating thickness. Along with the drag measurement using the strain balance, velocity and pressure were measured for different coatings. The compliant coatings with the thickness h = 7mm achieved 4~5% drag reduction within a velocity range 30~40 m/s. The drag reduction mechanism of the attenuation of turbulence velocity fluctuations due to the compliant coating was demonstrated. It is envisioned that larger drag reduction effect is obtainable at higher flow velocities for high speed trains and subsonic aircrafts.


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    Titel :

    Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds


    Beteiligte:
    Boiko, Andrey V. (Autor:in) / Kulik, Victor M. (Autor:in) / Chun, Ho-Hwan (Autor:in) / Lee, Inwon (Autor:in)


    Erscheinungsdatum :

    2011




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch


    Klassifikation :

    BKL:    55.40 Schiffstechnik, Schiffbau / 50.92 Meerestechnik, Meerestechnik / 55.40 Schiffstechnik, Schiffbau, Schiffstechnik, Schiffbau / 50.92 Meerestechnik



    Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds

    Andrey V. Boiko / Victor M. Kulik / Ho-Hwan Chun et al. | DOAJ | 2011

    Freier Zugriff

    Compliant coatings for drag reduction

    Gad-el-Hak, Mohamed | Online Contents | 2002


    Aerodynamic Drag Reduction Using Compliant Coatings

    E. F. Blick / C. W. Bert / T. D. Reed et al. | NTIS | 1968



    Compliant MEMS provide stiff competition

    Little, M. | British Library Online Contents | 2002