Active control of jet-plate interaction noise for excited jets by plasma actuators

Direct observation of refraction and scattering of sound on vortices and radiation of sound by vortices in subsonic turbulent jets at aeroacoustic interaction

In this paper, we construct the Hamiltonian description of the closed vortex filament dynamics in terms of non-standard variables, phase space and constraints. The suggested approach makes obvious interpretation of the considered system as a structured particle that possesses certain external and internal degrees of the freedom. The constructed theory is invariant under the transformation of Galilei group. The appearance of this group allows for a new viewpoint on the energy of a closed vortex filament with zero thickness. The explicit formula for the effective mass of the structured particle “closed vortex filament” is suggested.

About the non-standard viewpoint on the dynamics of closed vortex filament

In this article we construct the Hamiltonian description of the closed vortex filament dynamics in terms of non-standard variables, phase space and constraints. The suggested approach makes obvious interpretation of considered system as a quasiparticle that possess certain external and internal degrees of the freedom. The constructed theory is invariant under the transformation of Galilei group. The appearance of this group allows for a new viewpoint on the energy of a closed vortex filament with zero thickness. The explicit formula for the effective mass of the quasiparticle 'closed vortex filament' is suggested.

As applied to the problem of noise reduction of reactive jets in aviation engines, an investigation of the effect of dielectric barrier discharge (DBD) on velocity and static pressure pulsations was performed. The discharge was created inside an axisymmetrical subsonic nozzle near the nozzle exit section. The investigation was carried out in the jet formed by the nozzle at jet speeds of 80‐135 m/s. The data describing the DBD effect on the distribution of the average velocity at the nozzle exit, on the spectra of the velocity and pulsations, and also on the transformation of such an effect as long as we move from the nozzle section, are presented.

V. F. Kopiev

Papers

Corona discharge microjets as possible actuators for jet noise control