US 12,092,034 B2
Circumferentially varying fan casing treatments for reducing fan noise effects
Trevor Howard Wood, Clifton Park, NY (US); Ramakrishna Venkata Mallina, Mason, OH (US); Giridhar Jothiprasad, Clifton Park, NY (US); Kishore Ramakrishnan, Rexford, NY (US); and Thomas Malkus, Albany, NY (US)
Assigned to General Electric Company, Cincinnati, OH (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Oct. 3, 2022, as Appl. No. 17/958,549.
Prior Publication US 2024/0117768 A1, Apr. 11, 2024
Int. Cl. F02C 7/24 (2006.01); F01D 11/08 (2006.01); F02C 3/06 (2006.01); F02C 7/045 (2006.01)
CPC F02C 7/24 (2013.01) [F01D 11/08 (2013.01); F02C 3/06 (2013.01); F02C 7/045 (2013.01); F05D 2240/14 (2013.01); F05D 2250/184 (2013.01); F05D 2260/96 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotary component for a gas turbine engine, the rotary component comprising:
a plurality of rotor blades operably coupled to a rotating shaft extending along the central axis; and
an outer casing arranged exterior to the plurality of rotor blades in a radial direction of the gas turbine engine, the outer casing defining a gap between a blade tip of each of the plurality of rotor blades and the outer casing,
wherein the outer casing comprises a plurality of features formed into an interior surface thereof, each of the plurality of features comprising one or more design parameters that are perturbed about a mean design parameter for stall performance so as to provide a circumferential variation in wake strengths associated with the plurality of rotor blades, thereby reducing operational noise of the gas turbine engine, and wherein the one or more design parameters together define a wave pattern with a plurality of circumferential wave cycles, wherein a number of the plurality of circumferential wave cycles is equal to a multiple of a number of downstream guide vanes.