Experimental study of wingtip vortices behind the finite-span wing


Аuthors

Stepanov R. P.1*, Kusyumov A. N.1**, Mikhailov S. A.1***, Mikhailov S. A.2****

1. Kazan National Research Technical University named after A.N. Tupolev, 10, Karl Marks str., Kazan, 420111, Russia
2. Central Aerohydrodynamic Institute named after N.E. Zhukovsky (TsAGI), 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia

*e-mail: robert_stepanov@inbox.ru
**e-mail: postbox7@mail.ru
***e-mail: michailov@kai.ru
****e-mail: Sergey.Mikhaylov@kai.ru

Abstract

The article presents the results of experimental study of wingtip vortices behind a rectangular wing of a finite-span in the near field (at a distance of 0.5 to 4.2 wing chords length from the trailing edge). A rectangular wing with a modified Göttingen 387 airfoil and aspect ratio of 7.8 was used in the experiments.

During the experiments, the Reynolds number corresponded to Re = 350000, and an incoming flow velocity was set to 28 m/s. Wing tip vortices were studied at various angles of attack in the range from —6° to +18°. Experiments were performed in T-1K wind tunnel of Kazan National Research Technical University named after A.N. Tupolev. The wingtip vortices study was performed by the velocity fields, obtained with PIV-system. Parameters identification of the vortex core was performed employing Cross-Sectional Lines method and Q-criterion, and demonstrated good agreement. The article presents dependencies of the core size changing on the angle of attack and a distance to the core section. It is shown that the vortex core size increases away from the wing the wing and the angle of attack increasing. The dependencies of the vortex core square on the Q value were plotted. It was established that the wingtip vortex bunch stranding at large angles of attack occurs at the shorter distances, than at the smaller angles of attack. The article demonstrates that maximum value of relative circulation is almost constant and independent from the angle of attack value.

Keywords:

wingtip vortices, near field, finite-span wing

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