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• W2316264265 abstract "*† ‡ § This work is part of our ongoing research in the development and application of localized arc filament plasma actuators (LAFPA) to control high-speed and high Reynolds number jets for noise mitigation. The jet in the current work is an axisymmetric Mach 0.9 jet with a Reynolds number based on the nozzle exit diameter of 7.6x10 5 . We increased the number of actuators, distributed azimuthally inside the nozzle, near the nozzle exit, from 8 to 12, enabling us to excite higher azimuthal modes of the jet (m=0 to 5 and m=±1, ±2, ±3, and ±6) over a large frequency range (StDF of 0.1 to 5.0). Time-resolved pressure measurements, PIV measurements along with the Galilean decomposition of the velocity field, and far-field acoustic measurements were used to investigate the growth and decay of perturbations and instability waves in the flow, to visualize large-scale structures and the effects of control on the turbulence field, and to evaluate the control effects on the radiated noise field. Excitations with lower frequencies coupled to the flow, and the instability waves grew slowly, saturated farther downstream, stayed saturated for a longer time, and then gradually decayed, similar to the reported results in the literature using other techniques. The saturation and decay of instability waves moved upstream as the excitation frequency increased. Instability waves with higher azimuthal modes exhibited faster decay. Excitation of the jet around the jet preferred mode Strouhal number produced robust and coherent large-scale structures, similar to those in much lower speed and lower Reynolds number jets. The structures became smaller and less coherent in higher Strouhal number excitation. Far-field acoustic results show a significant noise increase when the jet is excited around the jet preferred mode Strouhal number (StDF=0.2-0.5), with larger increase from the shallower angle to the jet axis (30°) to the larger angle (90°), in agreement with the results in the literature. Noise reduction is observed over a large excitation frequency range - this reduction seems to peak around StDF =1.0 to 2.0 at 30°, but around StDF =3.0 to 3.5 at 90°. While forcing the jet with higher azimuthal modes (limited to m=0 to 5 in the current experiments, extended from m=0 to 3 in our previous work) is advantageous for noise mitigation at 30° and lower frequencies, the effect is not as clear in higher forcing frequencies and at 90°." @default.
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• W2316264265 date "2007-05-21" @default.
• W2316264265 modified "2023-10-16" @default.
• W2316264265 title "Noise Mitigation in High Speed and High Reynolds Number Jets Using Plasma Actuators" @default.
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• W2316264265 doi "https://doi.org/10.2514/6.2007-3622" @default.
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