Investigation of droplet path in a rain erosion tester

Mac Gaunaa*, N N Sørensen, N Frost-Jensen Johansen, Anders Smærup Olsen, C Bak, R B Andersen

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

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Abstract

Erosion of the leading edges of wind turbine blades due to the repeated impact of rain droplets at high speed over time can wear down the blade surfaces to the extent that power production is significantly reduced for the wind turbines. Therefore a rain erosion tester, which is a test bench for accelerated test of leading erosion due to rain impact, can be used to assess the durability of different leading edge materials and coatings. Since the droplet relative speed and size at impact is of key importance to the erosion process, it is important to know how these are affected by the complex flow disturbances stemming from the rain erosion tester itself. This is investigated in the present work using high speed camera recordings and CFD. The high speed camera recordings reveal that the droplets do not break up before impact at the surface, and that the path of the droplets is relatively undisturbed by the flow induced by the rain erosion tester. The comparison with droplet paths simulated in CFD is in good agreement with this result. The CFD simulations further indicate that an inaccurately set pitch angle of the blades can result in a very different flowfield in the RET, which can significantly alter the droplet trajectories.
Original languageEnglish
Article number062030
Book seriesJournal of Physics: Conference Series
Volume1037
Issue number6
Number of pages10
ISSN1742-6596
DOIs
Publication statusPublished - 2018
EventThe Science of Making Torque from Wind 2018 - Politecnico di Milano (POLIMI), Milan, Italy
Duration: 20 Jun 201822 Jun 2018
Conference number: 7
http://www.torque2018.org/

Conference

ConferenceThe Science of Making Torque from Wind 2018
Number7
LocationPolitecnico di Milano (POLIMI)
CountryItaly
CityMilan
Period20/06/201822/06/2018
Internet address

Bibliographical note

Content from this work may be used under the terms of the Creative 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.

Cite this

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title = "Investigation of droplet path in a rain erosion tester",
abstract = "Erosion of the leading edges of wind turbine blades due to the repeated impact of rain droplets at high speed over time can wear down the blade surfaces to the extent that power production is significantly reduced for the wind turbines. Therefore a rain erosion tester, which is a test bench for accelerated test of leading erosion due to rain impact, can be used to assess the durability of different leading edge materials and coatings. Since the droplet relative speed and size at impact is of key importance to the erosion process, it is important to know how these are affected by the complex flow disturbances stemming from the rain erosion tester itself. This is investigated in the present work using high speed camera recordings and CFD. The high speed camera recordings reveal that the droplets do not break up before impact at the surface, and that the path of the droplets is relatively undisturbed by the flow induced by the rain erosion tester. The comparison with droplet paths simulated in CFD is in good agreement with this result. The CFD simulations further indicate that an inaccurately set pitch angle of the blades can result in a very different flowfield in the RET, which can significantly alter the droplet trajectories.",
author = "Mac Gaunaa and S{\o}rensen, {N N} and Johansen, {N Frost-Jensen} and Olsen, {Anders Sm{\ae}rup} and C Bak and Andersen, {R B}",
note = "Content from this work may be used under the terms of the Creative 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.",
year = "2018",
doi = "10.1088/1742-6596/1037/6/062030",
language = "English",
volume = "1037",
journal = "Journal of Physics: Conference Series (Online)",
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Investigation of droplet path in a rain erosion tester. / Gaunaa, Mac; Sørensen, N N; Johansen, N Frost-Jensen; Olsen, Anders Smærup; Bak, C; Andersen, R B.

In: Journal of Physics: Conference Series, Vol. 1037, No. 6, 062030, 2018.

Research output: Contribution to journalConference articleResearchpeer-review

TY - GEN

T1 - Investigation of droplet path in a rain erosion tester

AU - Gaunaa, Mac

AU - Sørensen, N N

AU - Johansen, N Frost-Jensen

AU - Olsen, Anders Smærup

AU - Bak, C

AU - Andersen, R B

N1 - Content from this work may be used under the terms of the Creative 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.

PY - 2018

Y1 - 2018

N2 - Erosion of the leading edges of wind turbine blades due to the repeated impact of rain droplets at high speed over time can wear down the blade surfaces to the extent that power production is significantly reduced for the wind turbines. Therefore a rain erosion tester, which is a test bench for accelerated test of leading erosion due to rain impact, can be used to assess the durability of different leading edge materials and coatings. Since the droplet relative speed and size at impact is of key importance to the erosion process, it is important to know how these are affected by the complex flow disturbances stemming from the rain erosion tester itself. This is investigated in the present work using high speed camera recordings and CFD. The high speed camera recordings reveal that the droplets do not break up before impact at the surface, and that the path of the droplets is relatively undisturbed by the flow induced by the rain erosion tester. The comparison with droplet paths simulated in CFD is in good agreement with this result. The CFD simulations further indicate that an inaccurately set pitch angle of the blades can result in a very different flowfield in the RET, which can significantly alter the droplet trajectories.

AB - Erosion of the leading edges of wind turbine blades due to the repeated impact of rain droplets at high speed over time can wear down the blade surfaces to the extent that power production is significantly reduced for the wind turbines. Therefore a rain erosion tester, which is a test bench for accelerated test of leading erosion due to rain impact, can be used to assess the durability of different leading edge materials and coatings. Since the droplet relative speed and size at impact is of key importance to the erosion process, it is important to know how these are affected by the complex flow disturbances stemming from the rain erosion tester itself. This is investigated in the present work using high speed camera recordings and CFD. The high speed camera recordings reveal that the droplets do not break up before impact at the surface, and that the path of the droplets is relatively undisturbed by the flow induced by the rain erosion tester. The comparison with droplet paths simulated in CFD is in good agreement with this result. The CFD simulations further indicate that an inaccurately set pitch angle of the blades can result in a very different flowfield in the RET, which can significantly alter the droplet trajectories.

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DO - 10.1088/1742-6596/1037/6/062030

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