Acoustic Liners Behavior Investigation Using the Multimodal Scattering Matrix
| Autor: | Gwenael Gabard, J. M. Ville, Mohamed Taktak, Félix Foucart, Mohamed Haddar |
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| Rok vydání: | 2015 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Scattering Acoustics Aerospace Engineering Finite element method symbols.namesake Resonator In plane Higher order mode Control and Systems Engineering Helmholtz free energy symbols Duct (flow) Electrical and Electronic Engineering Electrical impedance |
| Zdroj: | International Review of Aerospace Engineering (IREASE). 8:198 |
| ISSN: | 2533-2279 1973-7459 |
| Popis: | In this paper, the acoustic behavior of Helmholtz’s resonator type liner used in aeronautics applications is presented. The aim of this work is to study how the liner properties can be modified by the mounting conditions on the wall of a cylindrical duct element. To achieve this objective the measured multi-port scattering matrix, power acoustic dissipations are compared with results performed by FEM assuming axi-symmetry and a uniform and locally reacting material which impedance is measured or resulting from a model. Results show that in plane wave conditions the agreement between experiment and theory is satisfying but that a large discrepancy occurs when higher order mode is incident on the liner element pointing out a modification of the acoustic properties of the lined wall. |
| Databáze: | OpenAIRE |
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