Qualitative yaw stability analysis of free-yawing downwind turbines

Wanke, Gesine; Hansen, Morten Hartvig; Larsen, Torben Juul

doi:https://doi.org/10.5194/wes-4-233-2019

Articles | Volume 4, issue 2

https://doi.org/10.5194/wes-4-233-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wes-4-233-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 4, issue 2

Research article

|

15 May 2019

Research article |

| 15 May 2019

Qualitative yaw stability analysis of free-yawing downwind turbines

Gesine Wanke, Morten Hartvig Hansen, and Torben Juul Larsen

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Final revised paper (published on 15 May 2019)
Preprint (discussion started on 27 Nov 2018)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Review of wes-2018-69', Anonymous Referee #1, 20 Dec 2018
- AC1: 'Answer to Referee comment #1', Gesine Wanke, 10 Jan 2019
RC2: 'Review comments', Vasilis A. Riziotis, 14 Jan 2019
- AC2: 'Answer to Referee comment #2', Gesine Wanke, 18 Jan 2019

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Gesine Wanke on behalf of the Authors (15 Feb 2019) Author's response Manuscript

ED: Referee Nomination & Report Request started (07 Mar 2019) by Carlo L. Bottasso

RR by Vasilis A. Riziotis (27 Mar 2019)

ED: Publish as is (27 Mar 2019) by Carlo L. Bottasso

ED: Publish as is (25 Apr 2019) by Carlo L. Bottasso (Chief editor)

AR by Gesine Wanke on behalf of the Authors (25 Apr 2019) Manuscript

Short summary

In this paper the results of the stability analysis of a free-yawing downwind turbine are shown and the turbine's ability to align the rotor passively with the wind direction is investigated. The results show that a tilt angle causes the equilibrium yaw position of free-yawing downwind to be non-zero. It is shown that an increase in cone angle can stabilize the free-yaw mode significantly, while blade flapwise flexibility will increase the risk of an instability of the free-yaw mode.