title: On the one-dimensional acoustic propagation in conical ducts with stationary mean flow.
abstract: This paper proposes a direct time-domain calculation of the time-domain responses of anechoic conical tubes with steady weak mean flow. The starting point is the approximated linear one-dimensional wave equation governing the velocity potential for the case of steady flow with low Mach number. A traveling solution with general space-dependent propagation velocity is then proposed from which the inward and outward pressure and velocity impulse responses can be obtained. The results include the well-known responses of conical and cylindrical ducts with zero mean flow.
authors.affiliation: Department of Mechanical Engineering, E.T.S.E.I.B., Polytechnic University of Catalunya, Diagonal 647, 08028 Barcelona, Spain. ana.barjau@upc.edu
authors.forename: Ana
authors.initials: A
authors.lastname: Barjau
mesh_terms: D000162:Acoustics; D016014:Linear Models; D008962:Models, Theoretical; D009038:Motion; D011312:Pressure; D012212:Rheology; D013997:Time Factors