The problem of low-frequency sound propagation in slowly varying ducts is systematically analysed as a perturbation problem of slow variation. The Webster equation and some variants are derived, and the entrance/exit plane boundary layer is given. It is shown why a varying lined duct in general does not have a solution.
|Title of host publication||8th AIAA/CEAS Aeroacoustics Conference (Breckenridge CO, USA, June 17-19, 2002), Paper AIAA 2002-2520|
|Publication status||Published - 2002|
|Event||8th AIAA/CEAS Aeroacoustics Conference - Breckenridge, United States|
Duration: 17 Jun 2002 → 19 Jun 2002
|Conference||8th AIAA/CEAS Aeroacoustics Conference|
|Period||17/06/02 → 19/06/02|