Vortex methods to answer the need for improved understanding and modelling of tip-loss factors

Emmanuel Branlard, Kristian Dixon, Mac Gaunaa

    Research output: Contribution to journalJournal articleResearchpeer-review


    Standard blade element momentum (BEM) codes use Prandtl¿s tip-loss correction which relies on simplified vortex theory under the assumption of optimal operating condition and no wake expansion. The various tip-loss functions found in the literature are listed. A simple comparison between them shows important differences in Annual Energy Production which reveal a large uncertainty in current BEM-based computations. A new tip-loss correction for implementation in BEM codes has been developed using a lifting-line code to account for the effect of wake expansion, roll-up and distortion under many operating conditions. A database of tip-loss corrections is established for further use in BEM codes. This model is closer to the physics of the flow and hence, a better assessment of the performance of wind turbines by this method is expected. © The Institution of Engineering and Technology 2013
    Original languageEnglish
    JournalI E T Renewable Power Generation
    Issue number4
    Pages (from-to)311-320
    Publication statusPublished - 2013


    • Power, Energy and Industry Applications


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    • Wind turbine tip-loss corrections

      Branlard, E. S. P.


      Project: Research


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