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- W2023387142 abstract "Abstract The effect of re-optimizing single layer linings in the presence of wall shear layers is investigated theoretically for an inlet Mach number of 0·40 and for four values of the non-dimensional frequency at which maximum attenuation is desired. A lining optimized in the absence of shear has its performance degraded by boundary layer refraction, but re-optimizing the lining in the presence of shear results in a substantial recovery of the attenuation loss. This recovery is achieved by reducing the lining resistance R ϱc and increasing its airspace backing depth. A set of curves that could be used for preliminary lining design is also presented for an inlet Mach number of 0·40 giving the optimum non-dimensional resistance R g9c and the optimum d h when shear is present. These curves are based on the assumption of uniform distribution of acoustic energy among the modes." @default.
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- W2023387142 date "1972-07-01" @default.
- W2023387142 modified "2023-09-24" @default.
- W2023387142 title "Optimization of acoustic linings in presence of wall shear layers" @default.
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- W2023387142 doi "https://doi.org/10.1016/0022-460x(72)90562-7" @default.
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