Modelling of inboard stall delay due to rotation

Comprehensive Aerodynamic Analysis of a 10 MW Wind Turbine Rotor Using 3D CFD

“…Figures 6 to 9 show the resulting airfoil data (3D CFD AAT) compared to the original 2D CFD data corrected for 3D effects using the models by Bak et al, 6 Snel et al, 1 Lindenburg, 4 Chaviaropoulos and Hansen, 3 Du and Selig, 2 Dumitreschu et al 5 Note that the published reference airfoil data is that using the 3D correction by Bak et al…”

“…The airfoil data used to design the DTU 10MW RWT is based on 2D CFD and subsequently corrected for 3D effects using the model by Bak et al 6 In this paper airfoil data is derived using 3D CFD using the so-called Azimuthal Averaging Technique (AAT), see e.g. Johasen et al 21 The 3D CFD based data are compared to the baseline data as well as airfoil data derived using the models by Snel et al, 1 Lindenburg, 4 Chaviaropoulos and Hansen, 3 Du and Selig, 2 and Dumitreschu et al 5 BEM simulations are carried out using HAWC2 with the AAT-based airfoil data to quantify the benefits of using this computationally considerably more costly method to derive airfoil data. Finally, airfoil data for off-design standstill conditions in the range AOA = [-180,180] are calculated based on 3D CFD unsteady Detached Eddy Simulations (DES) on a single blade.…”

Inboard Stall Delay Due to Rotation

“…The widely used Pohlhausen (Schlichting, 1979) and Mager (Mager, 1951) velocity profiles and the associated closure relations are introduced to solve the laminar integral boundary layer equations (Dumitrescu et al, 2007). For the turbulent boundary layer a power law-type of velocity profile is assumed for the mean stream velocity profile…”

Performances and Stall Delays of Three Dimensional Wind Turbine Blade Plate-Models with Helicopter-Like Propeller Blade Tips

“…A study on stall-delay for horizontal axis wind turbines (HAWT) (Hu, Hua, & Du, 2006), and the energetic turbulence structures during stall delay has been elucidated (Wu, Mun, & Tang, 2015). Consecutive modeling of inboard stall delay due to rotation has been performed, gave a conceptualization of the complex 3-D flow field on a rotor blade where stall begins and how it progresses (Dumitrescu & Cardoş, 2002;Dumitrescu, Cardoş, & Dumitrache, 2007). Computational fluid dynamic (CFD) investigations have been conducted at different wind speeds from 5 m/s to 9 m/s showing the flow characteristics and the stall delay phenomenon of wind turbine rotor due to blade rotation (Yu, Shen, Zhu, & Du, 2011).…”