By A.S. Ginevsky, Y.V. Vlasov, R.K. Karavosov
Results of experimental examine on aerodynamic and acoustic keep an eye on of subsonic turbulent jets via acoustic excitation are provided. It was once tested that those keep watch over equipment, originated by means of authors, not just can accentuate blending (by acoustic irradiation at low frequency), but additionally particularly ease it (at high-frequency irradiation). This examine monograph offers the up-to-date result of the authors supplemented through different investigations carried out in united states, Germany and nice Britain. The tools for the numerical simulation of subsonic turbulent jets lower than acoustic excitation are defined intimately, and examples are reviewed of useful functions, 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
05 o 2 4 6 8 10 12 14 x/d o 1 Q 2 c 4 v 3 o 2 4 6 8 10 12 14 x/d Fig. 24. The mixing intensification in a circular jet with square generators of longitudinal vortices (the square side is a = d /16); 1) without generators, 2) 8 generators, 3) 4 generators, 4) 2 generators. c. The jet issue from a circular nozzle with generators of longitudinal vortices. 3]. Fig. 24 presents the change in the average velocity and longitudinal velocity pulsations along the jet axis. The corresponding curves for a circular nozzle without voftex generators are shown for comparison purposes.
Geometrical Parameters Determining the Issue Initial Conditions. Geometrical parameters of a unit producing a jet influence essentially its aerodynamic and acoustical characteristics, as well as the configuration of the jet cross section in its initial region. Also, sometimes orifices with the flow separation over the sharp edge are used instead of nozzles to generate plane, circular and elliptic jets. Traditionally, to compare characteristics of 3-D and circular jets, the equivalent diameter, de' corresponding to the nozzle outlet cross section area F = 7rd; /4 is used as the nozzle characteristic geometric al parameter.
24. 25. Lighthill MI (1952) On sound generated aerodynamically. Part 1. General theory. Proc Roy Soc, Ser A 211, # 1107: 564 - 587. 26. Liu JTC (1989) Coherent structures in transitional and turbulent free shear flows. 27. Mansfeld AD, Rabinovich MI, Sushchik MM (1979) Noise and large-scale coherent structures in turbulence (in Russian). In: Transactions of 2nd All-Union symposium on physics of acoustic-hydrodynamic phenomena and optical acoustics. 28. Michalke A (1971) Instabilităt eines kompressiben runden Freisttrahls unter Beriicksichtigung des Strahlgrenzschichtdicke.