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Light detection and ranging measurements of wake dynamics. Part II: two-dimensional scanning

Authors

  • Juan-José Trujillo,

    Corresponding author
    1. Endowed Chair of Wind Energy, Institute of Aircraft Design, Universität Stuttgart, Allmandring 5B, D-70569 Stuttgart, Germany
    • ForWind - Center for Wind Energy Research Group, Wind Energy Systems, Carl von Ossietzky University of Oldenburg, Marie-Curie-Strasse 1, D-26129 Oldenburg, Germany
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  • Ferhat Bingöl,

    1. Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Wind Energy Division, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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  • Gunner C. Larsen,

    1. Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Wind Energy Division, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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  • Jakob Mann,

    1. Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Wind Energy Division, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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  • Martin Kühn

    1. Endowed Chair of Wind Energy, Institute of Aircraft Design, Universität Stuttgart, Allmandring 5B, D-70569 Stuttgart, Germany
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Abstract

A nacelle-mounted lidar system pointing downstream has been used to measure wind turbine wake dynamics. The new measurement and data analysis techniques allow estimation of quasi-instantaneous wind fields in planes perpendicular to the rotor axis. A newly developed wake tracking procedure delivers the instantaneous transversal wake position which is quantitatively compared with the prediction of the Dynamic Wake Meandering model. The results, shown for two 10-min time series, suggest that the conjecture of the wake behaving as a passive tracer is a fair approximation; this corroborates and expands the results of one-dimensional measurements already presented in the first part of this paper. Consequently, it is now possible to separate the deterministic and turbulent parts of the wake wind field, thus enabling capturing the wake in the meandering frame of reference. The results correspond, qualitatively and to some extent quantitatively, to the expectations from CFD simulations which are compared in the paper. Copyright © 2010 John Wiley & Sons, Ltd.

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