Interpretation and Mechanism of Restructuring of Near Wake Flow Caused by the Glow Dischargeстатья
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Дата последнего поиска статьи во внешних источниках: 1 апреля 2022 г.
Аннотация:The aim of the study is to interpret physically the effect of restructuring of the near wake produced by two cylinders under the action of a glow discharge. For this purpose, a version of the simple model of near wake is constructed on the basis of perturbation theory. Within the framework of this model, the complex wake is represented by two (according to the number of generating cylinders) von Karman partial streets which interact between each other in the zone of wake formation in the neighborhood of cylinders. Each of the streets can be simulated by an oscillator of the Van der Pole-Stuart-Landau type. On the basis of comparison of the experimental data for flow velocity oscillations and the model predictions, the wake regimes observed in gas and plasma flows are identified with global model modes. It is stated that the restructuring of the wake from a global hydrodynamic mode into intermittent modes was observed and this bifurcation is caused by the strengthening of interaction between the zones of formation of the von Karman partial streets resulted from the discharge switching-on.Keywords: formation of von Karman streets, global wake modes, intermittency of wake modes, boundary layer, ionization-overheating instability