Near-field wing-tip vortices and exponential vortex solution

摘要

Vortices shed from the tip of a rectangular half-span wing model (NACA 0012) have been investigated with particle image velocimetry at a chord Reynolds number between 3.4 × 10 4 and 26.6 × 10 4 and angles of attack α = 8 and 16 deg over 0.2 - 5 chord lengths downstream of the model. It has been found that the measured wing-tip vortex shows little dependence in the circumferential velocity v θ and vorticity Ω, when normalized by their local maximum, on α, Reynolds number, and downstream distance from the wing. Furthermore, the radial distributions of v θ and Ω coincide quite well with the exponential vortex solution, with only a slight departure outside the core region.