Analytical model for the power–yaw sensitivity  of wind turbines operating in full wake

Liew, Jaime; Urbán, Albert M.; Andersen, Søren Juhl

doi:https://doi.org/10.5194/wes-5-427-2020

Articles | Volume 5, issue 1

https://doi.org/10.5194/wes-5-427-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wes-5-427-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 5, issue 1

Research article

|

31 Mar 2020

Research article |

| 31 Mar 2020

Analytical model for the power–yaw sensitivity of wind turbines operating in full wake

Jaime Liew, Albert M. Urbán, and Søren Juhl Andersen

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Final revised paper (published on 31 Mar 2020)
Preprint (discussion started on 02 Oct 2019)

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'Referee comments', Wim Munters, 25 Oct 2019
RC2: 'Review: Analytical model for the power-yaw sensitivity of wind turbines operating in full wake', Anonymous Referee #2, 04 Nov 2019
AC1: 'Response to reviewer 1 and 2', Jaime Liew, 10 Dec 2019

Peer-review completion

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

AR by Jaime Liew on behalf of the Authors (02 Jan 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (10 Jan 2020) by Sandrine Aubrun

RR by Wim Munters (13 Jan 2020)

RR by Anonymous Referee #2 (24 Jan 2020)

Suggestions for revision or reasons for rejection

The authors of this manuscript did take the previous comments carefully into account and improved the quality and readability of the manuscript significantly. When reading the revised version, I came across some minor language mistakes (see below) and have some minor comments that would further improve the manuscript.

minor comments
p. 4 - figure (1)
In (a) and (b), the axes are now normalized to the rotor radius (or D/2), and it should be specified in the axes labels. Also, the information that a "trajectory close to the blade tip" was chosen, is missing now in the text and the caption.
The velocity deficit is normalized to U_0.

p. 6 - figure (2)
While the axes in figure (1) are normalized to D/2, here, the radial position is given in m. I would prefer to mention the diameter of the respective turbine, D_Turb=96.2m, once in the text and then normalize all axes for consistency.

p. 8 - l. 30 - the footnote for φ looks a bit like an exponent, you could maybe alternatively attach the footnote to "Kolmogorov constant"?

p. 10 - figure (4)
a) and b): the lateral position is again given in m and should be normalized.

p. 12 - discussion of figure (6): I think it would be nice to briefly mention here that the results obtained using the two wake models also agree quite well for the far wake in addition to the discussion on the Discussion.

p. 13 - l. 25
It might help some readers to explain that a curled wake shape is the result of a yawed turbine.

language/grammar
p. 2 - l.29 "...where the second turbine should indeed should..."
p. 3 - l. 27 "...can be performed in a seconds" => a few seconds
p. 6 - formula (6) and l. 4, the "=" was somehow replaced by a "-"
p. 7 - l. 15 "Each of ... aims to ..."
p. 8 - l. 8f. " Simulation (1) uses... Simulation (2) uses"
p. 8 - l. 10f. "different turbine spacings"
p. 9 - l. 3f. "The turbine and its wake are simulated"
p. 9 - l. 7ff "The wake profiles ...given that they includes..."
p. 9 - l. 9 "These effects are..."
p. 11 - caption figure (5) " ... for different turbine spacings"
p. 13, l. 15 "Secondly, The..."

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ED: Publish subject to minor revisions (review by editor) (27 Jan 2020) by Sandrine Aubrun

AR by Jaime Liew on behalf of the Authors (04 Feb 2020) Author's response Manuscript

ED: Publish as is (12 Feb 2020) by Sandrine Aubrun

ED: Publish as is (16 Feb 2020) by Jakob Mann (Chief editor)

AR by Jaime Liew on behalf of the Authors (16 Feb 2020)

Short summary

In wind farms, the interaction between neighboring turbines can cause notable power losses. The focus of the paper is on how the combination of turbine yaw misalignment and wake effects influences the power loss in a wind turbine. The results of the paper show a more notable power loss due to turbine misalignment when turbines are closely spaced. The presented conclusions enable better predictions of a turbine's power production, which can assist the wind farm design process.