Control of Aerodynamic Characteristics of Subsonic Turbulent Jets

Aerodynamic characteristics of turbulent jets and mixing layers can be changed by periodical action on the jet initial section flow. Such action could be realized by generation of periodical change in fluid consumption through the nozzle, by the nozzle vibrations or by excitation of the mixing layer at the nozzle edge using a vibrating band. The listed control approaches are connected with mechanical action on the flow because they require direct action on geometry of a unit generating the jet flow [2.10]. The mechanism of their action on the flow is determined by the jet periodical excitation causing generation of annular periodical vortices at the circular nozzle outlet section. Their interaction with each other essentially changes the flow in the mixing layer of the jet initial region.

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