Sound transmission in slowly varying circular and annular ducts with flow

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

142 Citaten (Scopus)


Sound transmission through straight circular ducts with a uniform inviscid mean flow and a constant acoustic lining (impedance wall) is classically described by a modal expansion. A natural extension for ducts with axially slowly varying properties (diameter and mean flow, wall impedance) is a multiple-scales solution. It is shown in the present paper that a consistent approximation of boundary condition and isentropic mean flow allows the multiple-scales problem to have an exact solution. Since the calculational complexities are no greater than for the classical straight duct model, the present solution provides an attractive alternative to a full numerical solution if diameter variation is relevant. A unique feature of the present solution is that it provides a systematic approximation to the hollow-to-annular cylinder transition problem in the turbofan engine inlet duct.
Originele taal-2Engels
Pagina's (van-tot)279-296
TijdschriftJournal of Fluid Mechanics
StatusGepubliceerd - 1999

Vingerafdruk Duik in de onderzoeksthema's van 'Sound transmission in slowly varying circular and annular ducts with flow'. Samen vormen ze een unieke vingerafdruk.

  • Citeer dit