An investigation of unsteady 3D effects on trailing edge flaps

About the suitability of different numerical methods to reproduce model wind turbine measurements in a wind tunnel with high blockage ratio

“…However, in the present case, the 15 blockage ratio amounts 40% and the minimal distance between blade tip and wall 0.6m. Fischer et al (2016) showed for a one third model of the turbine a high influence of the wind tunnel walls for a wind tunnel with the same minimal distance between blade tip and wall as in reality and Klein et al (2017) showed for the full model of BeRT in the GroWiKa an increase of 25% A comparison of the AoA distribution calculated by QBlade and FLOWer over the normalized radius at azimuth=0…”

“…The method was developed by Klein (2017) based on the method of Johansen and Sørensen (2004), who determined airfoil characteristics from 3d CFD rotor computations. It was successfully applied by Jost et al (2016) to investigate unsteady 3d effects on trailing edge flaps, and by Klein et al (2014) for CFD analysis of a 2-bladed multi-megawatt turbine. In the line averaging method (LineAve or CircAve), which was developed by Jost (2017), the AoA is determined by averaging the 15 velocity over a closed line around each blade cut (see Fig.…”

Suppressing Vortex Induced Vibrations of Wind Turbine Blades with Flaps

“…In particular, the influence of the installation of trailing edge flaps is assessed. Previous studies based on Computational Fluid Dynamics (CFD) methods have shown the potential of these devices for load alleviation during the operation of multi-megawatt wind turbines [Jost et al (2016); Barlas et al (2016)]. However, to the best of authors' knowledge no publication regarding the use of trailing edge flaps for VIV suppression can be found in the literature.…”