Airfoil acoustic impedance control
AssigneeUnited Technologies Corporation
InventorsRamons A. Reba, Bruce L. Morin, Stephen A. Morford, Wesley K. Lord
Life of this patent
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Abstract
A noise control cassette for a gas turbine engine includes a perforated face sheet configured for exposure to an airflow, a non-perforated backing sheet, a core arranged between the face sheet and the backing sheet and defining a cavity between the face sheet and the backing sheet having an effective length tuned so as to provide acoustic reactance control, and an attachment face for attaching the cassette to an airfoil-shaped structure.
Claims18
A noise control cassette assembly for a gas turbine engine, the cassette assembly comprising:
- a fan exit guide vane located downstream from a fan assembly and having a pocket defined at a pressure side of an airfoil portion of the fan exit guide vane;
- and a cassette comprising:
- a perforated face sheet configured for exposure to an airflow;
- a non-perforated backing sheet;
- a core arranged between the perforated face sheet and the non-perforated backing sheet and defining a cavity between the perforated face sheet and the non-perforated backing sheet having an effective length tuned so as to provide acoustic reactance control;
- and an attachment face attaching the cassette to the pocket of the fan exit guide vane.
A gas turbine engine apparatus comprising:
- a fan assembly;
- a fan exit guide vane located downstream from the fan assembly and having a pocket defined at a pressure side of an airfoil portion of the fan exit guide vane;
- and
- a cassette secured to the fan exit guide vane, the cassette comprising:
- a face sheet located adjacent to the pocket and having a plurality of openings defined therethrough;
- a non-perforated backing sheet positioned at least partially within the pocket;
- and
- a core arranged between the face sheet and the non-perforated backing sheet and defining a plurality of cavities each in fluid communication with at least one of the plurality of openings in the face sheet, wherein each cavity has a effective length tuned for providing noise dampening.
Dependencies are inferred from the claim text.