Abstract
Nowadays, not only the size of single wind turbines but also the size of wind farms is increasing. Understanding the interaction between the turbines and especially the wakes formed behind them are getting more important to further improve such wind turbine arrays. Consequently, new issues in wind energy research arise. An experimental wind tunnel study was conducted, in order to analyze and understand the far wake of a wind turbine. The experimental results were used to test if an analytical wake model derived by H. Schilichting for blunt bodies can be used to describe the velocity and width development in the far wake of wind turbines. The results of the evaluation show that the wake of a wind turbine agrees fairly well with the model according to Schlichting. The velocity deficit as well as the width in the wake behind the turbine, are found to deviate with around only 2% from the results obtained applying the analytical model. Thus, it can be concluded that the analytical wake model by Schlichting is well suited to estimate the velocity deficit and the width in the far wake of a wind turbine.
Highlights
IntroductionThe size of single turbines and that of wind farms has increased [1]
Over the last decades, the size of single turbines and that of wind farms has increased [1]
Velocity deficit in the yz-plane In figures 4a, 4b and 4c, two-dimensional contour plots of the full wake in the zy-plane are presented at distances of 6 D, 12 D and 18 D, respectively
Summary
The size of single turbines and that of wind farms has increased [1]. It is getting more and more important to understand the interactions between single turbines in a wind farm to further improve the overall efficiency. The wake formed behind the wind turbine plays a major role. This wake is mainly characterized by a velocity deficit and higher turbulence. The velocity deficit gradually decays downstream of the turbine, and the wake is fully developed. Axis-symmetry and a self-similar wake structure can be assumed [11]
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