US 12,435,671 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, Evendale, OH (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Sep. 5, 2024, as Appl. No. 18/824,999.
Application 18/824,999 is a continuation of application No. 17/958,549, filed on Oct. 3, 2022, granted, now 12,092,034.
Prior Publication US 2024/0426247 A1, Dec. 26, 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)] 12 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; and
an outer casing arranged radially outward to the plurality of rotor blades, 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, wherein the plurality of features include a plurality of circumferential grooves, wherein a depth of each of the plurality of circumferential grooves is varied, wherein the one or more design parameters of the plurality of features are related to a periodicity of downstream guide vanes of the gas turbine engine, wherein the one or more design parameters of the plurality of features together define a wave pattern with a plurality of circumferential wave cycles, and wherein a number of the plurality of circumferential wave cycles is equal to a multiple of the downstream guide vanes.