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% Creation date: 2023-03-30
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@Article { Barholomay2021,
   title = {Pressure-based lift estimation and its application to feed forward load control employing trailing-edge flaps},
   journal = {eawe, Wind Energy Science},
   year = {2021},
   number = {6},
   pages = {221 - 245},
   abstract = {This experimental load control study presents results of an active trailing-edge flap feedforward controller for wind turbine applications. The controller input is derived from pressure-based lift estimation methods that rely either on a quasi-steady method, based on a three-hole probe, or on an unsteady method that is based on three selected surface pressure ports. Furthermore, a standard feedback controller, based on force balance measurements, is compared to the feedforward control. A Clark-Y airfoil is employed for the wing that is equipped with a trailing-edge flap of x=c D 30\% chordwise extension. Inflow disturbances are created by a two-dimensional active grid. The Reynolds number is Re D 290000, and reduced frequencies of k D 0:07 up to k D 0:32 are analyzed. Within the first part of the paper, the lift estimation methods are compared. The surface-pressure-based method shows generally more accurate results, whereas the three-hole probe estimate overpredicts the lift amplitudes with increasing frequencies. Nonetheless, employing the latter as input to the feedforward controller is more promising as a beneficial phase lead is introduced by this method. A successful load alleviation was achieved up to reduced frequencies of k D 0:192.},
   url = {ttps://doi.org/10.5194/wes-6-221-2021},
   DOI = {doi.org/10.5194/wes-6-221-2021},
   author = {Bartholomay, S. and Wester, T. and Perez-Becker, S. and Konze, S. and Menzel, C. and H{\"o}lling, M. and Spickenheuer, A. and Peinke, J. and Nayeri, C. N. and Paschereit, C. O and Oberleithner K., Kilian}
}