Tidal turbine blade load experiments for oscillatory motion

Ian Milne, Alexander Day, Rajnish Sharma, Richard Flay, Simon Bickerton

Research output: Chapter in Book/Conference paperConference paperpeer-review


This paper presents blade root bending moment
measurements of a horizontal-axis tidal turbine for planar
oscillatory motion, conducted in a stationary water towing tank.
By comparing the measurements with quasi-steady reconstructions
for both single and multiple frequency oscillatory
motion, the bending moment was shown to be sensitive to both
frequency and amplitude, as well as to the mean tip-speed ratio.
The unsteady loads associated with the separation of the flow
and dynamic stall are shown to be of considerably greater
importance than those which are already present for attached
flow, such as added mass and dynamic inflow. A linear model fit
to the unsteady bending moment also indicates that the inertia
contribution is relatively small.

For cases where attached flow exists over the majority of the
load cycle, these reconstruction methods are likely to be sufficient
to obtain a reasonable prediction of the root out-of-plane bending
moment. However, turbines whose blades are likely to operate
near stall are likely to require more complex models for accurate
load predictions to mitigate the risk of fatigue failure
Original languageEnglish
Title of host publicationProceedings of the 9th European Wave and Tidal Energy Conference, EWTEC 2011
Place of PublicationCork, Ireland
PublisherTechnical Committee of the European Wave and Tidal Energy Conference
Publication statusPublished - 2011
Externally publishedYes
Event9th European Wave and Tidal Energy Conference - University of Southampton, Southampton, United Kingdom
Duration: 5 Sep 20119 Sep 2011
Conference number: 9


Conference9th European Wave and Tidal Energy Conference
Abbreviated titleEWTEC 2011
Country/TerritoryUnited Kingdom


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