By Jay Miller
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5. Approaches to Turbulent Jet Control We have already mentioned the important role of coherent structures in the largescale transition of impulse, heat and mass, as well as in the aerodynamic noise generation in turbulent subsonic jets. The study of generation, interaction and decay of these structures makes possible the considerable refining of the current views of the mechanism of turbulent mixing and noise generation in jets. e. for the aimed change of these characteristics. 28 CHAPTER 1 SUBSONIC TURBULENT JETS The known approaches to turbulence control in jet flows using action on their coherent structures can be subdivided into two pronounced categories: 1) passive control that is free of the outer energy input, and 2) active control consuming additional energy.
Therefore we can reason that the jet acoustical excitation efficiency depends on the initial turbulence level. 45]. The layout of the nozzle, acoustical emitters and turbulizing meshes is depicted in Fig. 18. Fig. 5, 3 and 5%. 15 - 5%). Fig. 30, x / d =9 and excitation level L = 130 dB. 50 CHAPTER 2. CONTROL OF AERODYNAMIC CHARACTERISTICS 1+-33 em+1 00 0,15%(1) 0,15% 0,5% 5% 3% Fig. 18. 8 em), (1) aeoustieal emitters and (2) turbulizing meshes. 1 5% r- \... , ___ ......... - / - o 1r ZI/ZIO f- J ~.
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. AIAA Pap 1960 Krasheninnikov SYu, Mironov AK, Vasiliev VI, Zakotenko SN (1998) An analysis of efficiency of mixer/ejector for aircraft jet noise suppression. In: Proc Internat EAA/EEAA Symp "Transport noise and vibration", Tallinn, pp 353 - 356 Laufer J (1974) On the mechanism of noise generated by turbulence.
Aerofax Extra: Lockheed F117a Stealth Fighter (Aerofax Extras) by Jay Miller