Demonstration of synchronised scanning Lidar measurements of 2D velocity fields in a boundary-layer wind tunnel

M F van Dooren, M. Kühn, V. Petrovic, C. L. Bottasso, F. Campagnolo, Mikael Sjöholm, Nikolas Angelou, Torben Krogh Mikkelsen, A. Croce, A. Zasso

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    Abstract

    This paper combines the currently relevant research methodologies of scaled wind turbine model experiments in wind tunnels with remote-sensing short-range WindScanner Lidar measurement technology. The wind tunnel of the Politecnico di Milano was equipped with three wind turbine models and two short-range WindScanner Lidars to demonstrate the benefits of synchronised scanning Lidars in such experimental surroundings for the first time. The dualLidar system can provide fully synchronised trajectory scans with sampling time scales ranging from seconds to minutes. First, staring mode measurements were compared to hot wire probe measurements commonly used in wind tunnels. This yielded goodness of fit coefficients of 0.969 and 0.902 for the 1 Hz averaged u- and v-components of the wind speed, respectively, validating the 2D measurement capability of the Lidar scanners. Subsequently, the measurement of wake profiles on a line as well as wake area scans were executed to illustrate the applicability of Lidar scanning to measuring small scale wind flow effects. The downsides of Lidar with respect to the hot wire probes are the larger measurement probe volume and the loss of some measurements due to moving blades. In contrast, the benefits are the high flexibility in conducting both point measurements and area scanning, and the fact that remote sensing techniques do not disturb
    the flow while measuring. The research campaign revealed a high potential for using short-range
    WindScanner Lidar for accurately measuring small scale flow structures in a wind tunnel.
    Original languageEnglish
    Article number072032
    Book seriesJournal of Physics: Conference Series (Online)
    Volume753
    Number of pages10
    ISSN1742-6596
    DOIs
    Publication statusPublished - 2016
    EventThe Science of Making Torque from Wind 2016 - Technische Universität München (TUM), Munich, Germany
    Duration: 5 Oct 20167 Oct 2016
    Conference number: 6
    https://www.events.tum.de/?sub=29

    Conference

    ConferenceThe Science of Making Torque from Wind 2016
    Number6
    LocationTechnische Universität München (TUM)
    Country/TerritoryGermany
    CityMunich
    Period05/10/201607/10/2016
    Internet address

    Bibliographical note

    Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd

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