Wind Tunnel Measurements at LM Wind Power

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This section presents the results obtained during the experimental campaign that was conducted in the wind tunnel at LM Wind Power in Lunderskov from August 16th to 26th, 2010. The goal of this study is to validate the so-called TNO trailing edge noise model through measurements of the boundary layer turbulence characteristics and the far-field noise generated by the acoustic scattering of the turbulent boundary layer vorticies as they convect past the trailing edge.
This campaign was conducted with a NACA0015 airfoil section that was placed in the wind tunnel section. It is equipped with high-frequency microphones beneath its surface so that surface pressure fluctuations generated by the boundary layer turbulence can be measured.
Hot-wire anemometry was used to measure mean flow velocities and turbulent fluctuations inside the boundary layer. For this, a traverse system was developped so that the hot-wire probes could be moved with a step motor perpendicularly to the airfoil chord in order to perform measurements across the boundary layer. The probes could be moved manually back and forth relatively to the inflow velocity and along the trailing edge in order to investigate several locations in the flow field.
As a second part of the experiment, the previous traverse system was removed and two airfoil-shaped probe-holders were installed instead. These were designed to hold in place two hot-wire sensors, one on each side of the trailing edge (below and above the plane spanned by the airfoil trailing edge and the inflow velocity) in an attempt to measure the velocity fluctuations associated to the pressure waves originating from the acoustic scattering at the trailing edge, which should behave as a dipole.
Original languageEnglish
Title of host publicationEUDP Project: Low Noise Airfoil - Final Report
PublisherWind Energy Department, Technical University of Denmark
Publication date2012
ISBN (Electronic)978-87-92896-03-2
Publication statusPublished - 2012
SeriesDTU Wind Energy E


  • DTU-Wind-Energy-E-0004(EN)
  • DTU-Wind-Energy-Report-E-0004


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