Hot Wire Anemometer Turbulence Measurements in the wind Tunnel of LM Wind Power

Publication: ResearchReport – Annual report year: 2012


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Flow measurements were carried out in the
wind tunnel of LM Wind Power A/S with a Dantec Streamline CTA
system to characterize the flow turbulence. Besides the free tunnel
flow with empty test section we also investigated the tunnel flow
when two grids with different mesh size were introduced
downstream of the nozzle contraction. We used two different hot
wire probes: a dual sensor miniature wire probe (Dantec 55P61) and
a triple sensor fiber film probe (Dantec 55R91). The turbulence
intensity measured with the dual sensor probe in the empty tunnel
section was significantly lower than the one measured with the
triple sensor probe. The turbulence intensity as well as the mean
flow velocity downstream of the grids were not homogeneous in
space. The grid with the finer mesh size created higher turbulence
intensity. For both grids we found a functional form of the power
spectral density of the velocity signal which is independent of the
flow velocity and Reynolds number.
Original languageEnglish
PublisherWind Energy Department, Technical University of Denmark
Number of pages31
ISBN (electronic)978-87-92896-05-6
StatePublished - 2012
SeriesDTU Wind Energy E


  • DTU-Wind-Energy-E-0006(EN), DTU-Wind-Energy-Report-E-0006
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