Boundary Layer Measurements of the NACA0015 and Implications for Noise Modeling

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    Abstract

    A NACA0015 airfoil section instrumented with an array of high frequency microphones flush-mounted beneath its surface was measured in the wind tunnel at LM Wind Power in Lunderskov. Various inflow speeds and angles of attack were investigated. In addition, a hot-wire device system was used to measure the velocity profiles and turbulence characteristics in the boundary layer near the trailing edge of the airfoil. The measured boundary layer data are presented in this report and compared with CFD results. A relative good agreement is observed, though a few discrepancies also appear. Comparisons of surface pressure fluctuations spectra are used to analyze and improve trailing edge noise modeling by the so-called TNO model. Finally, a pair of hot-wires were placed on each side of the trailing edge in order to measure the radiated trailing edge noise. However, there is no strong evidence that such noise could be measured in the higher frequency range. Nevertheless, low-frequency noise could be measured and related to the presence of the airfoil but its origin is unclear.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages66
    ISBN (Print)978-87-550-3656-7
    Publication statusPublished - 2011
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number1761(EN)
    ISSN0106-2840

    Bibliographical note

    Risø-R-1761

    Keywords

    • Aeroelastic design methods
    • Wind Energy
    • Risø-R-1761
    • Risø-R-1761(EN)

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