US 12,460,818 B2
Dilution holes with ridge feature for gas turbine engines
Dominic Mongillo, Jr., West Hartford, CT (US); Christopher Whitfield, Manchester, CT (US); and Tracy Propheter-Hinckley, Rocky Hill, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Jun. 26, 2024, as Appl. No. 18/755,570.
Application 18/755,570 is a division of application No. 17/466,999, filed on Sep. 3, 2021, granted, now 12,050,011.
Application 17/466,999 is a division of application No. 15/725,019, filed on Oct. 4, 2017, granted, now 11,137,140, issued on Oct. 5, 2021.
Prior Publication US 2024/0344701 A1, Oct. 17, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F23R 3/04 (2006.01); F23R 3/00 (2006.01); F23R 3/02 (2006.01); F23R 3/06 (2006.01)
CPC F23R 3/04 (2013.01) [F23R 3/002 (2013.01); F23R 3/02 (2013.01); F23R 3/06 (2013.01); F23R 2900/03041 (2013.01); F23R 2900/03042 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A grommet having an annular geometry inserted into a dilution hole of a combustor liner, the annular geometry comprising an inner diameter and an outer diameter of the grommet, the grommet being coupled to the combustor liner, wherein the inner diameter of the grommet defines an inner diameter of the dilution hole, the grommet comprising:
a ridge having a step geometry comprising at least one of a sharp geometry, a radial geometry, or a multi-radial geometry, the ridge formed about the inner diameter of the grommet and comprising a plurality of passages, wherein:
a step is defined by the step geometry and a ridge face geometry,
the ridge face geometry comprises the at least one of the sharp geometry, the radial geometry, or the multi-radial geometry,
each of the plurality of passages begins at an inlet disposed on a cold side of the ridge and ends at an outlet on a hot side of the ridge,
the outlet opens through a fillet of the ridge,
each of the plurality of passages is spaced apart circumferentially from an adjacent passage of the plurality of passages,
the plurality of passages are configured to direct cooling flow around the ridge to at least partially fill the ridge with cool air, wherein the fillet is disposed about the inner diameter of the grommet, wherein the outlet is configured to direct the cooling flow radially inward of the fillet and the ridge toward the dilution hole, and
a first of the plurality of passages includes an arc length that is greater than that of a second of the plurality of passages.