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TsAGI Science Journal

ISSN Druckformat: 1948-2590
ISSN Online: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2019030599
pages 155-167

ASYMMETRIC VORTEX FLOW WITH DOUBLE VORTEX BREAKDOWN ON A DELTA WING AT ZERO SIDESLIP

Konstantin Anatolievich Osipov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, 140180, Moscow Region, Russia

ABSTRAKT

The results of numerical simulation of the vortex flow around a thin delta wing with a large sweep angle at subsonic speeds within a wide range of angles of attack at zero sideslip are presented. The results on both the integral characteristics and flow topology, as well as on the position of the burst of vortex structures coming off the wing side edges, are compared to available experimental data. The influence of the curvature correction procedure in the two-parameter k-ω shear stress transport turbulence model on the pressure coefficient, velocity component in the vortex core, and vortex breakdown position is shown. Both symmetric and asymmetric solutions to the vortex structure bursts are obtained. At critical angles of attack (αcr ~ 45°), asymmetric breakdown of the vortex structures is obtained. The phenomenon of double vortex breakdown, when the vortex coming off one side of the wing's lateral edge is destroyed twice, is observed for the first time. Verification of the numerical calculations is implemented for all of the considered flow regimes.

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