INFLUENCE OF A JET VORTEX GENERATOR ON A TURBULENT BOUNDARY LAYER 2: ANALYSIS OF UNSTEADY CHARACTERISTICS
P. A. Polivanov1,2, V. V. Markin1, A. A. Sidorenko1, S. D. Salenko2
1Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences (ITAM SB RAS), Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: jet vortex generator, active flow control, boundary layer, flow separation, vortex
Abstract
We analyze unsteady characteristics of the flow resulting from the interaction between a longitudinal vortex-generated by jet injection from a wall-and a turbulent boundary layer. Velocity fields are measured using particle image velocimetry. Our data analysis includes the assessment of turbulence anisotropy and characteristic length scales of turbulent structures, as well as proper orthogonal decomposition. The results reveal mutual interaction between the turbulent boundary layer and the longitudinal vortex, which depends on the vortex intensity. It is demonstrated that the jet vortex generator significantly alters not only the mean flow but also the unsteady characteristics of the turbulent boundary layer.
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