2025 Volume 3 Article ID: 235
The wake of two co-rotating vortex generators (VGs) was investigated using particle image velocimetry in a low-speed wind tunnel. The model had a rectangular shape with an aspect ratio of 4. The height was 20 mm, which was determined to be equal to the local boundary layer thickness at the model position. The spacing between the two VGs was varied (40, 70, 80, or 120 mm). The angle of each VG was set to 20 degrees. Two cross sections downstream of the VGs (160 and 724.8 mm downstream of the trailing edge, denoted as the near and far fields, respectively) were used for the particle image velocimetry measurement. It was found that two separate vortices were emitted from each VG in the near field, even for a small VG spacing (e.g., 40 mm). These vortices eventually merged into a single vortex in the far field due to the interaction between them. Under this interaction, the vortices are attenuated more rapidly compared to that produced by a single VG, for which there is no interaction between the vortices.
