Abstract
Results of an experimental investigation related to near-field wing tip vortices are presented. The measurements were carried out using a PIV-system in T-1K wind tunnel of KNRTU-KAI. Q-criterion and crosssectional lines method were used to determine vortex core locations, which showed a good agreement. It is shown that the circulation of tip vortices remains constant at low to moderate angles of attack, and decreases in the stream-wise direction for higher angles of attack. It is also shown that the vortex core radius increases in the stream-wise direction, taking larger values at higher angles of attack.
Highlights
Results of an experimental investigation related to near-field wing tip vortices are presented
It is shown that the vortex core radius increases in the stream-wise direction, taking larger values at higher angles of attack
Stream-wise vortices are encountered in a wide range of practical applications
Summary
Stream-wise vortices are encountered in a wide range of practical applications. These vortices are known to be intense and persistent and cause many adverse effects in different practical applications, especially in finite span wings and rotary wings. This includes high acoustic noise, vibrations and mechanical fatigue [1]. Some of the recent experimental investigations include the work of Sun and Daichin [7], where the influence of the ground effect on the wing tip vortices was investigated on a NACA0012 wing. Ahmadi-Baloutaki et al [8] carried out experiments on the effect of the external free-stream turbulence in the near-field of a wing-tip vortex using hot-wire anemometry, which showed that the increase of the external free-stream turbulence tends to increase the vortex diffusion
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