Experimental study of the kinetic energy budget in a wind turbine streamtube

  • Lebron J
  • Castillo L
  • Meneveau C
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Abstract

The classical streamtube analysis for a wind turbine couples the Bernoulli equation with the actuator-disk model to obtain the maximum possible power extraction at the wind turbine based on the difference between inlet and outlet fluxes of kinetic energy. However, the classical analysis neglects turbulence, which can play a crucial role in the various interactions of the streamtube with the turbulent Atmospheric Boundary Layer (ABL). The present study aims at examining the fluxes of kinetic energy on a wind turbine streamtube including the effects of turbulence, based on an existing Particle Image Velocimetry (PIV) data set obtained previously in a wind tunnel study of a model wind farm. The data are used to evaluate the most relevant fluxes of kinetic energy through the various parts of the control surface bounding the stream tube. It is found that the flux due to mean axial velocity, the turbulence-induced flux across the periphery of the streamtube, and the power extracted at the wind turbine are all o...

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Authors

  • J. Lebron

  • L. Castillo

  • C. Meneveau

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