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US 6,619,913 B2Granted
Fan casing acoustic treatment
AssigneeGeneral Electric Company
InventorsRobert Paul Czachor, Paul Michael Smith, Robert Eugene Kraft
Life of this patent
Estimating the term…
Abstract
A fan casing for a gas turbine engine is provided which combines the functions of blade containment and noise suppression. The fan casing has an annular metallic inner shell with a plurality of holes are formed therethrough. An acoustic absorber, such as a cellular resonator, is disposed around the inner shell.
Claims12
A fan casing comprising:
- an annular metallic inner shell having forward, middle, and aft sections, said forward and aft sections having an increased thickness relative to that of said middle section, wherein a plurality of holes are formed through said forward and aft sections;
- an annular outer shell surrounding and spaced apart from said inner shell so as to define a circumferentially extending cavity;
- and
- an acoustic absorber disposed around said inner shell.
1 more element
A fan assembly comprising:
- a plurality of blades mounted to a disk rotatable about an axis;
- an annular metallic inner shell surrounding said plurality of blades, said inner shell having a thickness sufficient to resist penetration by a blade released from said disk, wherein a plurality of holes are formed through said inner shell;
- an annular outer shell surrounding and spaced apart from said inner shell so as to define a circumferentially-extending cavity;
- and
- an acoustic absorber disposed around said inner shell.
2 more elements
Dependencies are inferred from the claim text.