Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2018-24
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
20 Mar 2018
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Wind Energy Science (WES).
Wind tunnel study on power and loads optimization of two yaw-controlled model wind turbines
Jan Bartl1, Franz Mühle2, and Lars Sætran1 1Department of Energy and Process Engineering, Norwegian University of Science And Technology, Trondheim, Norway
2Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
Abstract. In this experimental wind tunnel study the effects of intentional yaw misalignment on the power production and loads of a downstream turbine are investigated for full and partial wake overlap situations. Power, thrust force and yaw moment are measured on both the upstream and downstream turbine. The influence of inflow turbulence level and streamwise turbine separation distance are analyzed for full wake overlap situations. For partial wake overlap the concept of downstream turbine yawing for yaw moment mitigation is examined for different lateral offset positions.

Results indicate that upstream turbine yaw misalignment is able to increase the combined power production of the two turbines for both partial and full wake overlap setups. For aligned turbine setups the combined power is increased between 3.5 % and 11 % depending on the inflow turbulence level and turbine separation distance. The increase in combined power is at the expense of increased yaw moments on both upstream and downstream turbine. For partial wake overlap situations, yaw moments on the downstream turbine can be mitigated through upstream turbine yawing, while simultaneously increasing the combined power production. A final test case demonstrates the concept of opposed downstream turbine yawing in partial wake situations, which is shown to reduce its yaw moments and increasing its power production by up to 5 %.

Citation: Bartl, J., Mühle, F., and Sætran, L.: Wind tunnel study on power and loads optimization of two yaw-controlled model wind turbines, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2018-24, in review, 2018.
Jan Bartl et al.
Jan Bartl et al.
Jan Bartl et al.

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Short summary
Our experimental wind tunnel study on a pair of two model wind turbines demonstrates a significant potential of turbine yaw angle control for the combined optimization of turbine power and rotor loads. Depending on the turbines’ relative positions to the incoming wind, a combined power increase and individual rotor load reduction can be achieved by operating the turbine rotors slightly misaligned with the main wind direction (i.e. at a certain yaw angle).
Our experimental wind tunnel study on a pair of two model wind turbines demonstrates a...
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