Acoustic Control of Turbulent Jets by A.S. Ginevsky, Y.V. Vlasov, R.K. Karavosov

By A.S. Ginevsky, Y.V. Vlasov, R.K. Karavosov

Results of experimental examine on aerodynamic and acoustic regulate of subsonic turbulent jets via acoustic excitation are offered. It was once proven that those regulate tools, originated by way of authors, not just can accentuate blending (by acoustic irradiation at low frequency), but additionally 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 equipment for the numerical simulation of subsonic turbulent jets lower than acoustic excitation are defined intimately, and examples are reviewed of functional functions, together with aid of turbojet engine noise and acoustic regulate of self-sustained oscillations in wind tunnels.

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Part 1. Characteristics of unexcited and excitedjets. J Fluid Mech 208: 257 - 320 Isataev SI, Tarasov SB (1972) On velocity pulsation characteristic frequencies and spectra in initial regions ofaxisymmetric jets (in Russian). In: Applied and theoretical physics 4, Alma-Ata, pp 247 - 252 Isataev SI, Tarasov SB (1975) On velocity pulsation characteristic scales in the transition area of free axisymmetric jets (in Russian). In: Applied and theoretical physics 7, Alma-Ata, pp 140 - 146 Kibens V (1981) The limit of initial shear layer influence on jet development.

17 presents functions u/u_ and u' /u~ at the jet axis depending on the sound pressure level L at the sections x / d = 2 and 6 for the laminar and turbulent boundary layers at the nozzle cut-off. 17 and L > 115 dB causes the sensible decrease of the velocity pulsations at the jet axis (by 15 - 18%); for the initial turbulent boundary layer similar decrease is achieved only for L = 120 - 130 dB. 4. 06. e. the partial turbulence suppression, is realized irrespective of the flow mode in the boundary layer of the nozzle outlet section.

Munin AG, Kuznetsov VM, Leontyev EA (1981) Aerodynamic sources of noise (in Russian). 33. Petersen RA (1979) Influence of wave dispersion on vortex pairing in a jet. 34. Rabinovich MI, Sushchik MM (1983) Coherent structures in turbulent flows (in Russian). In: Nonlinear waves. 35. Roshko A (1976) Structure of turbulent shear flows: A new look. 36. Sorkin LI (ed) (1968) Ca1culations and measurements of characteristics of noise generated in the far noise field by jet airplanes (in Russian). 37. Sreenivasan KR (1984) The azimuthal correlations of velocity and temperature fluctuations in an axisymmetric jet.

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