Abstract
The explicit multiple-scales solution, presented in AIAA-No 98-2311, for modal sound transmission through slowly varying ducts with mean flow and acoustic lining, is extended to include the case of a (nominally) lossless liner (Z=0). Especially the hydrodynamic or vortical mode is examined since this contains, in cooperation with higher order modes, the possibility of sound production or absorption by transfer of acoustic energy to and from the vorticity layer.
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