High-Reynolds-number investigations on the ability  of the full-scale e-TellTale sensor to detect flow separation on a wind turbine blade section

Soulier, Antoine; Braud, Caroline; Voisin, Dimitri; Danbon, Frédéric

doi:https://doi.org/10.5194/wes-7-1043-2022

Articles | Volume 7, issue 3

https://doi.org/10.5194/wes-7-1043-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wes-7-1043-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 7, issue 3

Research article

|

23 May 2022

Research article |

| 23 May 2022

High-Reynolds-number investigations on the ability of the full-scale e-TellTale sensor to detect flow separation on a wind turbine blade section

Antoine Soulier, Caroline Braud, Dimitri Voisin, and Frédéric Danbon

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Final revised paper (published on 23 May 2022)
Preprint (discussion started on 17 May 2021)

Interactive discussion

Status: closed

RC1:
'Comment on wes-2021-4', Anonymous Referee #1, 26 Jun 2021

\noindent{\bf General comments}

\quad In this manuscript, the authors intend to show the ability of the full scale e-TellTale sensor to detect the separation state of the flow on turbine blades.

\quad The wind tunnel experiment of 2D NACA 65_{4}$-421 with 0.693m in chord length was conducted at Reynolds number of 8.85x10^{5}$with pressure measurement. Several configurations of e-TellTale sensor are tested on the surface and the signal was measured for each configuration. The result shows that the sensors are able to detect the separation states from both leading edge and trailing edge. It is also found that its sensitivity for different states are depend on its configuration.

\quad This work presents an important evaluation of the innovative device for the progress of the sophisticated turbine control including active flow control technologies on the blade.

\quad I strongly recommend this paper for publication with however revised to raise the reliability of the work. I hope the following comments help the authors for their revision.

\noindent{\bf Specific comments}

\quad The authors failed to convince readers the above explanation in Section 3 because there are no data. The authors should show the pressure distribution taken in this experiment to show the flow separation state for each slope of Cl. \par

\quad The inconsistency between Cls in Figure 8, 9 is also confusing for the readers to believe the reliability of this manuscript. \par

\quad Cl’s for Figure 10-12 seems to use the same data. The authors should show measured Cl slope for each experiment as explained in l.126 to show the ability of the sensor to detect the slope for each configuration. Otherwise, the authors should show the slope for each configuration are the same in another Figure. \par

\quad The authors should explain some features in Figures to make them reliable. For Figure 12, the authors should explain the reason why the Mean LENSL signal is 0.1 for low AOAs. For Figure 13, the authors should explain the possibility of interaction of the Shell of the sensor for the Standard deviation of TENSS signal at low AOAs \par

\noindent{\bf Technical corrections}

I pointed out many errors or strange phrases as follows. I strongly recommend the review by a native English speaker.

- Title: High Reynolds investigation -> High Reynolds number investigation \\\

- P.1, l.3: high Reynolds -> high Reynolds number

- P.1, l.10: strong shears upstream of the rotor due to a malfunction of the wind turbine -> I recommend checking the phrases. \\\

- P.1, l.11: In order to limit the influence of these disturbances on the wind turbine, modern pitch-regulated wind turbines are operational today. -> Is this means the IPC system? \\\

- P.1, l.15: The former -> The latter? \\\

- P.1, l.17: rotation -> adjustment? \\\

- P.2, l.25: silicon -> silicone \\\

- P.2, l.32: high Reynolds -> high Reynolds number \\\

- P.2, l.33: 8.85 -> 8.85 x \\\

- P.3, l.56: framework -> coordinate axis? \\\

- P.3, l.56: y is -> y in \\\

- P.3, l.68: silicon -> silicone \\\

- P.3, l.72: high Reynolds -> high Reynolds number \\\

- P.3, l.73: lift coefficient -> lift coefficient variations? \\\

- P.3, l.73: angle of incidence -> AOA? Use the same words throughout the manuscript. \\\

- P.4, Figure 4.: Also show a picture of the TENSS type for the readers understanding. \\\

- P.4, l.80: What is “this last position”? \\\

- P.4, l.86: “the more rigid the strip is, the less signal is transmitted” Is this a result of the experiment? \\\

- P.4, l.87: “by keeping only the central part of the strip that is thicker” Add a picture in Figure.4 to understand this phrase. \\\

- P.4, l.91: slope modifications -> slope? \\\

- P.5, l.96: “which may be at the origin of some discrepancies in the exact values of the separations angles.” -> discrepancies from what? \\\

- P.5, l.98: separation -> separation point? \\\

- P.5, l.102: separated < -> attached? \\\

- P.5, l.102: separated < -> attached? \\\

- P.5, l.108: not always -> Did you repeat the test? \\\

- P.5, Figure 8: Make clear the border line of the figure.\\\

- P.6, Figure 9: Make clear the border line of the figure.\\\

- P.6, l.115: pressure distributions -> How do you know the pressure distribution from the lines? \\\

- P.6, l.118: There is not any significant difference -> There are indeed differences. \\\

- P.6, l.121: slope change -> slope? \\\

- P.10, l.135: show the region of the transition flow state in Figure 10. \\\

- P.10, l.147: low Reynolds -> low Reynolds number \\\

- P.10, Figure 10: Add proper labels and units on each axis. \\\

- P.11, l.154: Define A and T. \\\

- P.11, l.170: Refer Figure 12 in this subsection. \\\

- P.11, l.171: trailing -> leading \\\

- P.12, Figure 11: Add proper labels and units on each axis. \\\

- P.13, Figure 12: Add proper labels and units on each axis. \\\

- P.12, Figure 12: Add proper labels and units on each axis. \\\

- P.14, l.205: shared is -> shared

- P.15, l 213:Bartholomay2018 -> Correct the title.\\\

- P.15, l 233: Shaquarin2013 -> Correct the authors.\\\

- P.15, l 241: Swytink2016 -> Correct the title.\\\

Citation: https://doi.org/10.5194/wes-2021-4-RC1
- RC3: 'Reply on RC1', Anonymous Referee #1, 07 Jul 2021
  
  Dear Authors,
  I am the reviewer RC1. I have posted by accident a comment with TEX style. I'd like to post the final version as attached because the posted comment cannot be deleted in this system. Sorry for making you confused.
  
  Citation: https://doi.org/10.5194/wes-2021-4-RC3
- AC1: 'Reply on RC1', Caroline Braud, 23 Aug 2021
  
  Please find our response (response to Reviewer #2 is integrated).
  
  Citation: https://doi.org/10.5194/wes-2021-4-AC1
RC2:
'Comment on wes-2021-4', Anonymous Referee #2, 04 Jul 2021

The comment was uploaded in the form of a supplement: https://wes.copernicus.org/preprints/wes-2021-4/wes-2021-4-RC2-supplement.pdf

Citation: https://doi.org/10.5194/wes-2021-4-RC2
- AC2: 'Reply on reviewer #2', Caroline Braud, 23 Aug 2021
  
  Please find our response in the supplement manuscript (response to Reviewer #1 is integrated).
  
  Citation: https://doi.org/10.5194/wes-2021-4-AC2

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload

AR by Caroline Braud on behalf of the Authors (23 Aug 2021) Author's response Author's tracked changes Manuscript

ED: Referee Nomination & Report Request started (08 Oct 2021) by Raúl Bayoán Cal

RR by Anonymous Referee #1 (20 Oct 2021)

RR by Anonymous Referee #2 (14 Mar 2022)

ED: Publish subject to minor revisions (review by editor) (01 Apr 2022) by Raúl Bayoán Cal

AR by Caroline Braud on behalf of the Authors (07 Apr 2022) Author's response Author's tracked changes Manuscript

ED: Publish as is (24 Apr 2022) by Raúl Bayoán Cal

ED: Publish as is (30 Apr 2022) by Athanasios Kolios (Chief editor)

AR by Caroline Braud on behalf of the Authors (03 May 2022)

Short summary

The e-TellTale, a new aerodynamic sensor, has been tested in a large wind tunnel at CSTB. This sensor has been designed to detect the flow separation on wind turbine blades, which can cause energy production losses and increased aging of the blades. These wind tunnel tests highlighted the good ability of the e-TellTale to detect the flow separation and the influence of the size and location of the e-TellTale on the flow separation detection.