Vortex Generator Induced Flow in a High Re Boundary Layer

The Science of Making Torque from Wind 2012

Velte, C.M.^1 ; Braud, C.^2,3 ; Coudert, S.^2,3 ; Foucaut, J.-M.^2,4

Wind Energy Department, Technical University of Denmark, Lyngby

2800 Kgs, Denmark^1

University Lille Nord de France, Lille

F-59000, France^2

CNRS, Laboratoire de Mécanique de Lille (UMR 8107), Boulevard Paul Langevin, Villeneuve d'Ascq Cedex

59655, France^3

EC Lille, Laboratoire de Mécanique de Lille (UMR 8107), Boulevard Paul Langevin, Villeneuve d'Ascq Cedex

59655, France^4

关键词: Counter-rotating vortices;    Different geometry;    Helical symmetry;    High Reynolds number;    Measurement positions;    Self-similarities;    Stereoscopic particle image velocimetry;    Vortex generators;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012102/pdf
DOI  :  10.1088/1742-6596/555/1/012102

来源: IOP

【 摘 要 】

Stereoscopic Particle Image Velocimetry measurements have been conducted in cross-planes behind three different geometries of Vortex Generators (VGs) in a high Reynolds number boundary layer. The VGs have been mounted in a cascade producing counter-rotating vortices and the downstream flow development was examined. Three VG geometries were investigated: rectangular, triangular and cambered. The various VG geometries tested are seen to produce different impacts on the boundary layer flow. Helical symmetry of the generated vortices is confirmed for all investigated VG geometries in this high Reynolds number boundary layer. From the parameters resulting from this analysis, it is observed at the most upstream measurement position that the rectangular and triangular VGs produce vortices of similar size, strength and velocity induction whilst the cambered VGs produce smaller and weaker vortices. Studying the downstream development in the ensemble and spanwise averaged measurements, it is observed that the impact from the rectangular and triangular VGs differs. For the rectangular VGs, self-similarity in the streamwise component was confirmed.