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V.A.Voskoboinick Coherent vortex structures of the turbulent boundary layer on the longitudinal streamlined cylinder |
Applied hydromechanics, Vol. 14 (86) ¹ 1, (2012) |
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In the paper the results of experimental researches of the structure of
turbulent boundary layer on the flexible extensive longitudinally
streamlined cylinder are presented. Researches of the wall-pressure
fluctuation field by the ensemble of miniature sensors, flush-mounted with
the streamlined surface, allowed to study the features of forming and
development of the coherent vortical structures of the boundary layer. The
structure scales, their the generation periods and distance, which coherent
vortices are passed up to the degeneration, are determined. Influence of
the streamlined surface curvature of the cylinders and the flow regimes on
the structure of the vortex motion is demonstrated. Approximating
dependencies of determination of coherence function of the pressure
fluctuation field, convective velocity of moving of the vortical
structures, their longitudinal scale and distance of transfer along
formative of cylinder up to degeneration are resulted.
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KEY WORDS: turbulent boundary layer, longitudinal streamlined cylinder, wall-pressure fluctuation field |
| TEXT LANGUAGE: Russian |