Effect of Nature-Inspired Needle-Shaped Vortex Generators on the Aerodynamic Features of a Double-Delta Wing
The effects of using nature-inspired needle-shaped vortex generators (VGs) on the aerodynamic features of a 65°/35° double-delta wing were investigated experimentally in a wind tunnel. Particle Image Velocimetry (PIV) visualization was conducted on 7 chord-wise sections as well as 7 span-wise sections at an Angle of Attack (AOA) of 30° and on a plane adjacent to the wing surface at AOAs of 30° and 35°. The experiments were carried out at Re = 2 × 105. The double-delta wing was equipped with a series of VGs at the leading edge of the apex and kink area. The effect of VGs on the time-averaged vortical flow features was investigated and then compared to those of the plain wing model. The assessment of the vortices' diameter, vorticity and velocity distribution, streamline topology, circulation (Γ), and parameter Γ/Av showed that the use of the needle shaped VGs has an enhancing effect on the improvement in flow structure of the double-delta wing. The causes of the flow structure improvement were the increased flow momentum over and behind the wing, energized near-surface flow, a more concentrated vortex system, and delayed vortex breakdown.
Publisher URL: https://www.sciencedirect.com/science/article/pii/S002074032100237X
DOI: 10.1016/j.ijmecsci.2021.106502
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