Rain erosion of wind turbine blades and the effect of air bubbles in the coatings

Søren Fæster; Nicolai Frost‐Jensen Johansen; Leon Mishnaevsky; Yukihiro Kusano; Jakob Ilsted Bech; Martin Bonde Madsen

doi:10.1002/we.2617

Rain erosion of wind turbine blades and the effect of air bubbles in the coatings

Søren Fæster^*, Nicolai Frost‐Jensen Johansen, Leon Mishnaevsky, Yukihiro Kusano, Jakob Ilsted Bech, Martin Bonde Madsen

^*Corresponding author for this work

Villum Center for Advanced Structural and Material Testing

R&D A/S

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Abstract

Leading edge erosion on a wind turbine blade from Vindeby offshore wind farm is characterized by X‐ray tomography, and air bubbles within the top coat are observed. Similar coating systems with and almost without air bubbles within the top coat are tested on a R&D Test Systems style whirling arm rain erosion tester (RET) and found to have different V–N curves. In general, the slope of the two curves was comparable. However, the absolute performance value with RET differs significantly with up to 2.6 times performance advantage to the coating with less bubbles. A micromechanical model of the coating system that takes the air bubbles into account has been developed, and air bubbles are found to have critical effect on the crack initialization in the coating.

Original language	English
Journal	Wind Energy
Volume	24
Issue number	10
Pages (from-to)	1071-1082
Number of pages	12
ISSN	1095-4244
DOIs	https://doi.org/10.1002/we.2617
Publication status	Published - 2021

Keywords

Coatings
Leading edge erosion
Wind energy
X-ray tomography

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10.1002/we.2617Licence: CC BY-NC-ND

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MicroLab at DTU Wind Energy
Mikkelsen, L. P. (PI), Fæster, S. (PI), Vogeley, E. (PI) & Sørensen, B. F. (PI)
01/01/2021 → …
Project: Research

Cite this

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title = "Rain erosion of wind turbine blades and the effect of air bubbles in the coatings",

abstract = "Leading edge erosion on a wind turbine blade from Vindeby offshore wind farm is characterized by X‐ray tomography, and air bubbles within the top coat are observed. Similar coating systems with and almost without air bubbles within the top coat are tested on a R&D Test Systems style whirling arm rain erosion tester (RET) and found to have different V–N curves. In general, the slope of the two curves was comparable. However, the absolute performance value with RET differs significantly with up to 2.6 times performance advantage to the coating with less bubbles. A micromechanical model of the coating system that takes the air bubbles into account has been developed, and air bubbles are found to have critical effect on the crack initialization in the coating.",

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AU - Fæster, Søren

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AU - Mishnaevsky, Leon

AU - Kusano, Yukihiro

AU - Bech, Jakob Ilsted

AU - Madsen, Martin Bonde

PY - 2021

Y1 - 2021

N2 - Leading edge erosion on a wind turbine blade from Vindeby offshore wind farm is characterized by X‐ray tomography, and air bubbles within the top coat are observed. Similar coating systems with and almost without air bubbles within the top coat are tested on a R&D Test Systems style whirling arm rain erosion tester (RET) and found to have different V–N curves. In general, the slope of the two curves was comparable. However, the absolute performance value with RET differs significantly with up to 2.6 times performance advantage to the coating with less bubbles. A micromechanical model of the coating system that takes the air bubbles into account has been developed, and air bubbles are found to have critical effect on the crack initialization in the coating.

AB - Leading edge erosion on a wind turbine blade from Vindeby offshore wind farm is characterized by X‐ray tomography, and air bubbles within the top coat are observed. Similar coating systems with and almost without air bubbles within the top coat are tested on a R&D Test Systems style whirling arm rain erosion tester (RET) and found to have different V–N curves. In general, the slope of the two curves was comparable. However, the absolute performance value with RET differs significantly with up to 2.6 times performance advantage to the coating with less bubbles. A micromechanical model of the coating system that takes the air bubbles into account has been developed, and air bubbles are found to have critical effect on the crack initialization in the coating.

KW - Coatings

KW - Leading edge erosion

KW - Wind energy

KW - X-ray tomography

U2 - 10.1002/we.2617

DO - 10.1002/we.2617

M3 - Journal article

SN - 1095-4244

VL - 24

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EP - 1082

JO - Wind Energy

JF - Wind Energy

IS - 10

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Rain erosion of wind turbine blades and the effect of air bubbles in the coatings

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Keywords

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