Trailing edge noise is a common noise source in aerodynamic applications. Many prior experiments have shown that trailing edge serrations can reduce this noise, but the mechanism by which serrations reduce noise and their aerodynamic impact near the edge is not fully understood. Previous theoretical models have assumed that the turbulence convecting past a serrated trailing edge is unchanged by the presence of the serrations, but experiments have shown that this is not accurate. This work attempts to further the understanding of unsteady surface pressure fluctuations on sawtooth serrations. Experiments were performed in an anechoic wall-jet wind tunnel on an undercut trailing edge with a straight and serrated edge configuration. The magnitude of unsteady surface pressure fluctuations was found to increase near the tips of the serrations for Strouhal numbers near 0.5 based on edge thickness. Spanwise coherence was increased on a single serration, while coherence across the root of adjacent serrations was similar to results across a straight trailing edge at similar spanwise separation distance.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2021-05-13




    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :



    Flow Field Around a Serrated Trailing Edge at Incidence

    Arce, Carlos / Ragni, Daniele / Pröbsting, Stefan et al. | AIAA | 2015


    Aerodynamic noise of a serrated trailing edge

    Howe, M.S. | Tema Archiv | 1991


    A Trailing-Edge Noise Model for Serrated Edges

    Lyu, Benshuai / Azarpeyvand, Mahdi / Sinayoko, Samuel | AIAA | 2015


    Trailing edge noise prediction for rotating serrated blades

    Sinayoko, Samuel / Azarpeyvand, Mahdi / Lyu, Benshuai | AIAA | 2014