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

Research output: Contribution to journalJournal articleResearchpeer-review

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 languageEnglish
JournalWind Energy
Number of pages12
ISSN1095-4244
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Coatings
  • Leading edge erosion
  • Wind energy
  • X-ray tomography

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