Acoustic resonator
AssigneeAkwel
InventorsPascal Guerry, Adrien Eustache, Michel Robinault
Life of this patent
Estimating the term…
Abstract
The resonator is configured to attenuate the noise in a duct delimiting an internal channel for the flow of a fluid according to a reference axis, of the type including an annular compartment configured to extend around the channel and provided with at least one orifice forming a neck for communication with the flow channel so as to form a resonance chamber. Accordingly, the compartment has an inner structure with a geometry shaped so as to produce a revolution annular asymmetry of the resonance chamber about the reference axis, adapted to generate a phase shift of an acoustic pressure wave reflected inside the chamber relative to an acoustic pressure wave incident from the main flow.
Claims11
A resonator for attenuating noise in a duct, the duct having an internal channel for the flow of a fluid and a reference axis, the resonator comprising:
- a generally annular compartment extending around the internal channel, the generally annular compartment forming a generally annular Helmholtz resonance cavity;
- an orifice forming a neck connecting the generally annular Helmholtz resonance cavity with the internal channel, the orifice extending longitudinally along a circumference of the internal channel;
- and
- a generally tubular insert member around the reference axis intended to be inserted inside the duct which delimits, internally, the internal channel and, externally, with the duct, a space comprising the generally annular compartment,
- wherein the generally annular compartment presents an inner structure with a revolution asymmetry about the reference axis, the revolution asymmetry being adapted to generate a phase shift of an acoustic pressure wave propagating in the generally annular Helmholtz resonance cavity relative to an acoustic pressure wave propagating in the internal channel, and
- wherein the insert member has a tubular intermediate portion and end portions which are respectively convergent and divergent to and from the intermediate portion.
Dependencies are inferred from the claim text.