Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2017-62
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
21 Feb 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events
Jakob I. Bech, Charlotte B. Hasager, and Christian Bak Department of Wind Energy, Technical University of Denmark, Roskilde, 4000, Denmark
Abstract. Impact fatigue caused by collision with rain droplets, hail stones and other airborne particles, also known as rain erosion, is a severe problem for wind turbine blades. Each impact on the leading edge adds an increment to the accumulated damage in the material. After a number of impacts the leading edge material will crack. This paper presents and supports the hypothesis that the vast majority of the damage accumulated in the leading edge is imposed at extreme precipitation condition events, which occur during a very small fraction of the turbines operation life. By reducing the tip speed of the blades during these events, the service life of the leading edges significantly increases from a few years to the full expected lifetime of the wind turbine. In the worst case at the cost of a negligible reduction of annual energy production (AEP) and in the best case with a significant increase in AEP.
Citation: Bech, J. I., Hasager, C. B., and Bak, C.: Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-62, in review, 2018.
Jakob I. Bech et al.
Jakob I. Bech et al.
Jakob I. Bech et al.

Viewed

Total article views: 478 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
331 134 13 478 5 7

Views and downloads (calculated since 21 Feb 2018)

Cumulative views and downloads (calculated since 21 Feb 2018)

Viewed (geographical distribution)

Total article views: 478 (including HTML, PDF, and XML)

Thereof 469 with geography defined and 9 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 23 May 2018
Publications Copernicus
Download
Short summary
Rain erosion on wind turbine blades is a severe challenge for wind energy today. It causes significant losses in power production, and large sums are spent on inspection and repair. Blade life can be extended, power production increased, and maintenance costs reduced by rotor speed reduction at extreme precipitation events. Combining erosion test results, meteorological data and models of blade performance, we show that a turbine control strategy is a promising new weapon against blade erosion.
Rain erosion on wind turbine blades is a severe challenge for wind energy today. It causes...
Share