By A.S. Ginevsky, Y.V. Vlasov, R.K. Karavosov
Results of experimental learn on aerodynamic and acoustic regulate of subsonic turbulent jets via acoustic excitation are provided. It used to be proven that those keep an eye on equipment, originated by means of authors, not just can accentuate blending (by acoustic irradiation at low frequency), but in addition particularly ease it (at high-frequency irradiation). This learn monograph provides the up to date result of the authors supplemented by way of different investigations carried out in united states, Germany and nice Britain. The tools for the numerical simulation of subsonic turbulent jets less than acoustic excitation are defined intimately, and examples are reviewed of sensible purposes, together with aid of turbojet engine noise and acoustic regulate of self-sustained oscillations in wind tunnels.
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Extra resources for Acoustic Control of Turbulent Jets
47. Vlasov YeV, Ginevsky AS, Pimshtein VG (1992) Control of coherent structures and aero-acoustic characteristics of subsonic and supersonic turbulent jets. 48. Vlasov YeV, Ginevsky AC, Efimtsov BM, Kuznetsov VM, Munin AG, Samokhin VF, Smoliakov A V, Sobolev AF (1996) Main problems of acoustics (in Russian). Proc. 49. Vlasov YeV, Ginevsky AS, Karavosov RK, Makarenko TM (1999) Acoustical excitation of turbulent jets issuing from diaphragms (in Russian). In: Modern problems of aero-hydromechanics.
10]. The mechanism of their action on the flow is determined by the jet periodical excitation causing generation of annular periodic al 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. Under acoustical irradiation of a turbulent jet the direct interaction of the acoustical field and turbulent pulsations in the jet is practicaly unavailable, as the length of the acoustical waves far exceeds the nozzle reference size (its diameter) or the boundary layer thickness in the initial section of the mixing layer.
Functions u(x) and u'(x) for jets flowing out of a nozzle and diaphragm (1) a nozzle, 2) an orifice with sharp edges). 0 a D O /::, V O 5 10 15 b • 21 •.... • 3 4 5 x/de Fig. 23. 0; (a) - along the major axis; (b) - along the minor axis. B. The jet issue from an orifice with elliptic cross section. Fig. 23 presents the change in the cross section sizes along the flow for two perpendicular sections of a jet with the axis ratio of the elliptic section 3 : 2, 2 : 1, 4 : 1, 6 : 1, and 8 : 1. 18]. The cross section isotachs at the initial section near the orifice are homothetic to the orifice ellipse, then at some distance the isotachs become almost circular and later they stretch in the perpendicular direction.
Acoustic Control of Turbulent Jets by A.S. Ginevsky, Y.V. Vlasov, R.K. Karavosov