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CORRELATION BETWEEN ACTIVE GRID EXCITATION AND GENERATED WIND FIELD

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Turbulent wind fields play an important role for wind energy converters. Lift force fluctuations are strongly influenced by the statistics of the ambient turbulent wind field and lead to loads with similar characteristics. For realistic wind tunnel investigations, e.g. on wind turbine models, an active grid was build, which allows the dynamical generation of wind fields with comparable characteristics to those in the atmospheric boundary layer (ABL). In this work a new approach is presented, which describes the interaction between the active grid excitation and the resulting wind tunnel flow field. With this approach we are able to estimate synthetic velocity time series for grid excitations and predict their statistics. Statistical comparisons between synthetic time series and experimental data show a fairly good agreement. The goal of this approach is to find, by means of an optimization process, excitation protocols for the active grid, which generates particular flow cases of the ABL within the wind tunnel.

Author(s):

Nico Reinke    
ForWind, Center for Wind Energy Research,University of Oldenburg
Germany

Joachim Peinke    
ForWind, Center for Wind Energy Research,University of Oldenburg
Germany

Michael Hölling    
ForWind, Center for Wind Energy Research,University of Oldenburg
Germany