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

doi:10.1088/1742-6596/753/7/072032

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 language	English
Article number	072032
Book series	Journal of Physics: Conference Series (Online)
Volume	753
Number of pages	10
ISSN	1742-6596
DOIs	https://doi.org/10.1088/1742-6596/753/7/072032
Publication status	Published - 2016
Event	The Science of Making Torque from Wind 2016 - Technische Universität München (TUM), Munich, Germany Duration: 5 Oct 2016 → 7 Oct 2016 Conference number: 6 https://www.events.tum.de/?sub=29

Conference

Conference	The Science of Making Torque from Wind 2016
Number	6
Location	Technische Universität München (TUM)
Country/Territory	Germany
City	Munich
Period	05/10/2016 → 07/10/2016
Internet address	https://www.events.tum.de/?sub=29

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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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van Dooren, M. F., Kühn, M., Petrovic, V., Bottasso, C. L., Campagnolo, F., Sjöholm, M., Angelou, N., Mikkelsen, T. K., Croce, A., & Zasso, A. (2016). Demonstration of synchronised scanning Lidar measurements of 2D velocity fields in a boundary-layer wind tunnel. Journal of Physics: Conference Series (Online), 753, Article 072032. https://doi.org/10.1088/1742-6596/753/7/072032

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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 disturbthe flow while measuring. The research campaign revealed a high potential for using short-rangeWindScanner Lidar for accurately measuring small scale flow structures in a wind tunnel.",

author = "{van Dooren}, {M F} and M. K{\"u}hn and V. Petrovic and Bottasso, {C. L.} and F. Campagnolo and Mikael Sj{\"o}holm and Nikolas Angelou and Mikkelsen, {Torben Krogh} and A. Croce and A. Zasso",

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; The Science of Making Torque from Wind 2016, TORQUE 2016 ; Conference date: 05-10-2016 Through 07-10-2016",

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AU - van Dooren, M F

AU - Kühn, M.

AU - Petrovic, V.

AU - Bottasso, C. L.

AU - Campagnolo, F.

AU - Sjöholm, Mikael

AU - Angelou, Nikolas

AU - Mikkelsen, Torben Krogh

AU - Croce, A.

AU - Zasso, A.

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N2 - 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 disturbthe flow while measuring. The research campaign revealed a high potential for using short-rangeWindScanner Lidar for accurately measuring small scale flow structures in a wind tunnel.

AB - 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 disturbthe flow while measuring. The research campaign revealed a high potential for using short-rangeWindScanner Lidar for accurately measuring small scale flow structures in a wind tunnel.

U2 - 10.1088/1742-6596/753/7/072032

DO - 10.1088/1742-6596/753/7/072032

M3 - Conference article

SN - 1742-6596

VL - 753

JO - Journal of Physics: Conference Series (Online)

JF - Journal of Physics: Conference Series (Online)

M1 - 072032

T2 - The Science of Making Torque from Wind 2016

Y2 - 5 October 2016 through 7 October 2016

ER -

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

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