Incorporating Turbulent Inflow Conditions in a Blade Element Momentum Model of Tidal Stream Turbines

  • Togneri M
  • Masters I
  • Orme J
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Abstract

Blade element momentum theory (BEMT) allows much more rapid modelling of turbines than full Navier-Stokes simulations. Classical BEMT greatly simplifies flow conditions to make this rapidity possible; we can, however, modify BEMT to incorporate additional flow phenomena without sacrificing much in the way of calculation speed. Using an already-existing extended BEMT model, this paper explores how turbulent flows can be synthesised in order to predict their effects on turbine performance. Artificial turbulent flows are created based on data from a bed-mounted acoustic Doppler current profiler (ADCP). Our extended BEMT model is capable of predicting the response of a tidal turbine to a real measured flow; thus we can use the predictions of this model to calibrate our model of synthetic turbulence against real turbulence measurements. The accuracy of this turbulence synthesis is assessed by examination of both turbine performance and load parameters.

Author-supplied keywords

  • blade element
  • energy
  • marine
  • renewable
  • turbine

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Authors

  • Michael Togneri

  • Ian Masters

  • J.A.C Orme

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