Influence of longitudinal vortices generated by a jet vortex generator on characteristic scale of a turbulent shear layer in the region of a diffusion separation
V.V. Markin1, P.A. Polivanov1,2
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: jet vortex generator, active control, boundary layer, shear layer, separated flow
Abstract
The interaction of longitudinal vortices with a turbulent boundary layer and a mixing layer developing in the diffusion zone was experimentally studied. Vortices were generated using jet vortex generators located near the beginning of the model tail unit, forming a diffusion separation. The main measurements were performed using hot-wire anemometry (HWA) and PIV methods. Based on the experimental data, information was obtained on the flow velocity in the pre-separation and separation zones and the dynamic pressure magnitude; the scale of turbulent structures was calculated, and the influence of longitudinal vortices on these characteristics was estimated under various regimes of vortex generator operation. It was found that the effect of longitudinal vortices on the flow leads to a decrease in the separation zone and significantly affects the characteristic scale of turbulent structures.
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