Tidal turbine blade load experiments for oscillatory motion

I.A. Milne, Alexander Day, R.N. Sharma, R.G.J. Flay, S Bickerton

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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
Number of pages8
Publication statusPublished - 4 Sep 2011
Event9th European Wave and Tidal Energy Conference, EWTEC 2011 - Southampton, United Kingdom
Duration: 5 Sep 20119 Sep 2011


Conference9th European Wave and Tidal Energy Conference, EWTEC 2011
CountryUnited Kingdom


  • tidal turbine
  • dynamic inflow
  • dynamic stall
  • unsteady hydrodynamic loads
  • added mass

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