Articles | Volume 3, issue 1
Wind Energ. Sci., 3, 293–300, 2018

Special issue: Wind Energy Science Conference 2017

Wind Energ. Sci., 3, 293–300, 2018

Research article 24 May 2018

Research article | 24 May 2018

How does turbulence change approaching a rotor?

Jakob Mann et al.

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Cited articles

Batchelor, G. K. and Proudman, I.: The effect of rapid distortion of a fluid in turbulent motion, Q. J. Mech. Appl. Math., 7, 83–103, 1954. a, b
Branlard, E.: Wind Turbine Aerodynamics and Vorticity-Based Methods: Fundamentals and Recent Applications, vol. 7, Springer, 632 pp., 2017. a
Branlard, E., Mercier, P., Machefaux, E., Gaunaa, M., and Voutsinas, S.: Impact of a wind turbine on turbulence: Un-freezing turbulence by means of a simple vortex particle approach, J. Wind Eng. Ind. Aerod., 151, 37–47, 2016. a, b
Conway, J. T.: Analytical solutions for the actuator disk with variable radial distribution of load, J. Fluid Mech., 297, 327–355, 1995. a, b
de Maré, M. and Mann, J.: On the Space-Time Structure of Sheared Turbulence, Bound.-Lay. Meteorol., 160, 453–474,, 2016. a
Short summary
Turbulence is usually assumed to be unmodified by the stagnation occurring in front of a wind turbine rotor. All manufacturers assume this in their dynamic load calculations. If this assumption is not true it might bias the load calculations and the turbines might not be designed optimally. We investigate the assumption with a Doppler lidar measuring forward from the top of the nacelle and find small but systematic changes in the approaching turbulence that depend on the power curve.