DOI: 10.1615/TSFP7
INFLUENCE OF SWEEPBACK ON LEADING-EDGE VORTEX STABILIZATION
要約
The sweepback geometry characteristic of fish-like tails has been found to be insufficient for the stabilization of leading-edge vortices (LEVs) during unsteady motion. Direct force measurements and experimental visualizations, which include Particle Image Velocimetry (PIV) and Lead Precipitation, suggest that despite a strong spanwise flow in the LEV core at higher sweepback angles, the vortex breaks off and convects downstream at nearly the same time as for angles with little spanwise contribution. Despite the LEV's insensitivity to spanwise flow, the LEV and tip vortex were observed to maintain a stronger connection with one another at higher sweepback angles. This result implies that despite similar net performance for low and high sweepback angles alike, the resulting vortex-wake topologies varies dramatically from one another.