Flow behavior of skewed vortex generators on a backward-facing ramp

The impact of skewness angle on the effectiveness vortex generators (VGs) and behavior streamwise vortices flow separation behind a backward-facing ramp (BFR) with sharp transition were experimentally investigated using surface oil visualizations, planar stereoscopic particle image velocimetry measurements. Counter/corotating generated by set boundary layer-type rectangular VG located upstream BFR that comprised flat- 30-inclined sections different angles 10°, 20°, 30°. Local Reynolds number based location was Re x ≈ 3 × 10 6 . Results show reattachment length reduced ∼45% when five times its height ahead transition. Additionally, core left vane displayed strong dependence angle, whereby vorticity magnitude instability increase angle. Circulation radius are also observed to be physically larger less stable. In contrast, produced right displays opposite as increases. Lastly, is fluctuate more in vertical direction than horizontal direction.