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- W2946347276 abstract "This paper investigates the effects of axial liner displacement on modal attenuation and scattering. Tests are conducted with a uniform liner mounted in the NASA Langley Curved Duct Test Rig, with a multimode source at flow conditions of Mach 0.0 and 0.3. The impedance of the liner is educed from data acquired in the NASA Langley Grazing Flow Impedance Tube. This impedance is then used as input to the CDUCT-LaRC propagation code to enable comparisons of predicted and measured modal content upstream and downstream of the liner as the axial displacement is varied. Results show that the liner position has a clear effect on the sound field as the number of modes is increased from two to six. The comparison of measured and predicted modal content is very good when only a few modes are present. For frequencies in which more modes are present, this comparison is less favorable very near resonance, but improves for frequencies away from resonance." @default.
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- W2946347276 date "2019-05-18" @default.
- W2946347276 modified "2023-09-26" @default.
- W2946347276 title "Investigation of Liner Axial Displacement in a Complex Acoustic Environment" @default.
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- W2946347276 doi "https://doi.org/10.2514/6.2019-2566" @default.
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