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Communication Dans Un Congrès Année : 2020

Use flow to achieve an unidirectional acoustic propagation in a duct

Résumé

A mean flow in a waveguide can cause significant changes in wave propagation. Among the effects of flow (possibility of creating an acoustic gain, changes in the characteristics of the metamaterials located in the waveguide, etc.), the flow can be used as a vectorial field that break reciprocity in order to make a broadband acoustic diode. In this context, we demonstrate theoretically and experimentally that an acoustic diode can be manufactured in a flow duct by slowing down the acoustic wave. In the slow sound region, the effective sound velocity can be so low that no waves can propagate against the flow while propagation is still possible in the direction of flow. Sound is slowed down by putting locally reacting porous chamber around a cylindrical duct. This phenomenon can occur over a wide range of frequencies that can be extended to very low frequencies.
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Dates et versions

hal-03229434 , version 1 (21-05-2021)

Identifiants

Citer

Yves Aurégan, Vassos Achilleos, Vincent Pagneux. Use flow to achieve an unidirectional acoustic propagation in a duct. eForum Acusticum 2020, Dec 2020, Lyon, France. pp.773-775, ⟨10.48465/fa.2020.0016⟩. ⟨hal-03229434⟩
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