The wake characteristics of wind turbine arrays are studied using hotwire data taken from wind tunnel experiments. Conditional statistics and spectral decomposition are employed to gain information about the vertical entrainment of kinetic energy. Specifically, the scales of the flow responsible for remediating the momentum deficit are determined. The types and sizes of the organized coherent structures contributing to the remediation are also considered. The results show that the largest scales of the flow (2.5 times the rotor diameter) are responsible for the vertical entrainment as well as for the drop in Reynolds stress coherence over the wake profile. Furthermore, ejections structures are shown to be the largest contributor to the kinetic energy flux and the drop in size of ejection structures determines the difference in vertical flux between the top and bottom of the turbine array wake.
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