Abstract
A classical wave theory approach is used to determine the radial attenuation in a simulated centrifugal fan or pump diffuser lined with sound absorbing material. For all circumferential modes the attenuation at large radii is virtually the same as that of the lowest mode in a rectangular duct lined on two opposite sides. However, at small radii, the attenuation rate increases markedly above the rectangular duct lowest mode value as the number of nodal diameters is increased.
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