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- W2149845782 abstract "Our earlier work in noise mitigation using localized arc filament plasma actuators in a Mach 0.9 axisymmetric jet was extended in this paper to an ideally expanded Mach 1.3 axisymmetric jet. Far-field noise was measured at 30˚ and 90˚ locations relative to the jet axis to investigate the effects of azimuthal mode and forcing Strouhal number on the far-field noise. At both measuring locations, the OASPL increased over the baseline level at low forcing Strouhal numbers. At 30˚ location, a more reduction was found at higher order azimuthal modes. The maximum reductions in OASPL were 2.2 and 2.7 dB for m = 3 and ±4, respectively. The maximum reduction was observed near StDF = 1.0. At the sideline location (90˚), the OASPL was increased as at 30˚ location. The relative OASPL slowly decreased with increasing StDF and reached maximum reduction near StDF = 3.4. At this location, the maximum reduction in OASPL was about 1.0 dB for all modes. All these trends are similar to those observed in the Mach 0.9 jet, but the noise reduction levels were larger for Mach 1.3 jet than those obtained in the Mach 0.9 jet at both 30° and 90° locations." @default.
- W2149845782 created "2016-06-24" @default.
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- W2149845782 date "2008-01-07" @default.
- W2149845782 modified "2023-10-16" @default.
- W2149845782 title "Active Noise Control in a Mach 1.3 Ideally-Expanded Jet with Plasma Actuators" @default.
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- W2149845782 doi "https://doi.org/10.2514/6.2008-38" @default.
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