Acoustic Control of Turbulent Jets [Hardcover]

Results of experimental research on aerodynamic and acoustic control of subsonic turbulent jets by acoustic excitation are presented. It was demonstrated that these control methods, originated by authors, not only can intensify mixing (by acoustic irradiation at low frequency), but also notably ease it (at high-frequency irradiation). This research monograph presents the updated results of the authors supplemented by other investigations conducted in USA, Germany and Great Britain. The methods for the numerical simulation of subsonic turbulent jets under acoustic excitation are described in detail, and examples are reviewed of practical applications, including reduction of turbojet engine noise and acoustic control of self-sustained oscillations in wind tunnels.

Results of experimental research on aerodynamic and acoustic control of subsonic turbulent jets by acoustic excitation are presented. It was demonstrated that these control methods, originated by authors, not only can intensify mixing (by acoustic irradiation at low frequency), but also notably ease it (at high-frequency irradiation). This research monograph presents the updated results of the authors supplemented by other investigations conducted in USA, Germany and Great Britain. The methods for the numerical simulation of subsonic turbulent jets under acoustic excitation are described in detail, and examples are reviewed of practical applications, including reduction of turbojet engine noise and acoustic control of self-sustained oscillations in wind tunnels.

1. Subsonic Turbulent Jets.- 1.1. Aerodynamic Characteristics of Turbulent Jets. Coherent Structures.- 1.2. Coherent Structures and Hydrodynamic Instability.- 1.3. Acoustic Characteristics of Subsonic Turbulent Jets.- 1.4. Initial Conditions of Turbulent Jet Issue.- 1.4.1. Aerodynamic and Acoustical Parameters Characterizing the Issue Initial Conditions for Subsonic Submerged and Accompanying Turbulent Jets.- 1.4.2lóX