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Title: Analytic mode matching for a circular dissipative silencer containing mean flow and a perforated pipe
Authors: Kirby, R
Denia, FD
Keywords: Dissipative silencers;Mean flow;Mode matching;Exhaust silencers
Issue Date: 2007
Publisher: American Institute of Physics
Citation: Journal of the Acoustical Society of America 122 (6): 3471-3482, Dec 2007
Abstract: An analytic mode matching scheme that includes higher order modes is developed for a straight-through circular dissipative silencer. Uniform mean flow is added to the central airway and a concentric perforated screen separates the mean flow from a bulk reacting porous material. Transmission loss predictions are compared with experimental measurements and good agreement is demonstrated for three different silencers. Furthermore, it is demonstrated that, when mean flow is present, the axial kinematic matching condition should equate to that chosen for the radial kinematic boundary condition over the interface between the airway and the material. Accordingly, if the radial matching conditions are continuity of pressure and displacement, then the axial matching conditions should also be continuity of pressure and displacement, rather than pressure and velocity as previously thought. When a perforated screen is present the radial pressure condition changes, but the radial kinematic condition should always remain equivalent to that chosen for the axial kinematic matching condition; here, results indicate that continuity of displacement should be retained when a perforated screen is present.
ISSN: 0001-4966
Appears in Collections:Mechanical and Aerospace Engineering
Advanced Manufacturing and Enterprise Engineering (AMEE)
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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