Acoustic treatment for aircraft engine
AssigneePratt & Whitney Canada Corp.
InventorSid-Ali MESLIOUI
Life of this patent
Estimating the term…
Abstract
There is provided an acoustic treatment for an aircraft engine. The acoustic treatment has: a facing sheet configured to line a gas path portion of the aircraft engine having in use an airflow passing over the facing sheet, the facing sheet having a thickness and having perforations extending through the thickness; and a backing member spaced from the facing sheet to define a cavity between the facing sheet and the backing member, a ratio of the thickness of the facing sheet to an effective diameter of the perforations is less than or equal to 0.22.
Claims17
An acoustic treatment for an aircraft engine, the acoustic treatment comprising:
- a facing sheet configured to line a gas path portion of the aircraft engine having in use an airflow passing over the facing sheet, the facing sheet having a thickness and perforations extending through the thickness;
- and
- a backing member spaced from the facing sheet to define a cavity between the facing sheet and the backing member,
- wherein a ratio of the thickness of the facing sheet to an effective diameter of the perforations is less than or equal to 0.22.
A turbofan engine comprising:
- a fan rotatable about an axis within a fan case;
- and
- a fan case acoustic treatment having:
- a facing sheet configured to line a portion of the fan case, the facing sheet having a thickness and perforations extending through the thickness;
- and
- a backing member spaced from the facing sheet to define a cavity between the facing sheet and the backing member,
- wherein a ratio of the thickness of the facing sheet to an effective diameter of the perforations is less than or equal to 0.22.
An acoustic treatment for an aircraft engine, the acoustic treatment comprising:
- a facing sheet configured to line a portion of the aircraft engine, the facing sheet having a thickness and perforations extending through the thickness;
- and
- a backing member spaced from the facing sheet;
- and
- a cellular structure between the facing sheet and the backing member,
- wherein a ratio of the thickness of the facing sheet to an effective diameter of the perforations is at most 0.22.
Dependencies are inferred from the claim text.