Evaluation of two mathematical wind turbine wake models in various types of flow
report
In order to investigate the effects of tower and nacelle, as well as those of turbulent shear flow on the wind-turbine wake, wind tunnel experiments on a 0.36 m diameter horizontal-axis wind-turbine model have been carried out. These experiments consist of two series of measurements. The first series has been performed in low turbulent (CT^ ^ 0.56%) uniform flow over a fixed ground plane using a lattice and a circular shaped tower and two nacelle configurations (circular and rectangular respectively). The other measurements were performed in a simulated atmospheric boundary layer with varying rotor operating conditions (A. = 3.5 to A. = 9.3). From the first series of experiments no effects could be found as to the effect of tower shape or nacelle shape on the wake depth. In all cases the wake centerline moved towards the ground plane by approximately 1.7°. The experiments in the simulated atmospheric boundary layer show that the rotor drag and initial velocity deficit in the wake are strongly inter related. A slight power reduction of about 5% in maximum power coefficient in the ABL-flow conditions is observed, compared to the uniform flow con ditions. The results of the experiments are fully described in a data report [5].
Topics
TNO Identifier
250347
Publisher
TNO
Collation
74 p.
Place of publication
Apeldoorn
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