Cooled combustor liner grommet
A combustor liner grommet is disclosed. The grommet may include a peripheral wall defining a hole in a combustor liner and further including at least one cooling air flow channel. The cooling air flow channel in the grommet wall may be a slot or a hole. The channel may increase cooling flow to the grommet and the combustor liner around the grommet to prevent cracking from heat stress.
1. A grommet of a combustor liner, wherein the combustor liner is associated with an outer combustor shell, the grommet comprising:
a circumferential flange;
a peripheral wall upwardly extending from the circumferential flange, defining a hole in the combustor liner, the peripheral wall having a top surface, wherein the outer combustor shell is disposed on the top surface of the peripheral wall;
a cooling air flow channel in the peripheral wall; and
wherein the cooling air flow channel is a slot having an end abutting an air passage located between the outer combustor shell and the combustor liner, wherein the slot is disposed between the circumferential flange and the outer combustor shell, wherein the peripheral wall has a circumference defined entirely by a first circumferential portion and a second circumferential portion, and the slot spans at least 126 degrees around the circumference of the peripheral wall, thereby forming the first circumferential portion, wherein the second circumferential portion is a continuous grommet wall of the peripheral wall, complementing the first circumferential portion to form a full circle.
2. A combustor liner associated with an outer combustor shell, the combustor liner comprising:
a panel at least partially defining a combustion chamber, the panel having at least one opening;
a grommet proximate the at least one opening, the grommet comprising:
a circumferential flange;
a peripheral wall upwardly extending from the circumferential flange, defining a hole in the combustor liner, the peripheral wall having a top surface, wherein the outer combustor shell is disposed on the top surface of the peripheral wall;
a cooling air flow channel in the peripheral wall; and
wherein the cooling air flow channel is a slot having an end abutting an air passage located between the outer combustor shell and the combustor liner, wherein the slot is disposed between the circumferential flange and the outer combustor shell, wherein the peripheral wall has a circumference defined entirely by a first circumferential portion and a second circumferential portion, and the slot spans at least 126 degrees around the circumference of the peripheral wall, thereby forming the first circumferential portion, wherein the second circumferential portion is a continuous grommet wall of the peripheral wall, complementing the first circumferential portion to form a full circle.
3. The combustor liner of claim 2 , wherein the at least one combustor liner panel opening is adapted to receive an igniter.
4. A method of cooling a combustor liner and a grommet, comprising:
providing the grommet at an opening of the combustor liner, the grommet having a circumferential flange; a peripheral wall upwardly extending from the circumferential flange, defining a hole in the combustor liner, the peripheral wall having a top surface, wherein an outer combustor shell is disposed on the top surface of the peripheral wall; a cooling air flow channel in the peripheral wall; and wherein the cooling air flow channel is a slot having an end abutting an air passage located between the outer combustor shell and the combustor liner, wherein the slot is disposed between the circumferential flange and the outer combustor shell, wherein the peripheral wall has a circumference defined entirely by a first circumferential portion and a second circumferential portion, and the slot spans at least 126 degrees around the circumference of the peripheral wall, thereby forming the first circumferential portion, wherein the second circumferential portion is a continuous grommet wall of the peripheral wall, complementing the first circumferential portion to form a full circle and
communicating cooling air through the cooling air flow channel.
5. The method of claim 4 , further including providing the grommet at an igniter opening in the combustor liner, positioning an igniter in the igniter opening, and communicating the cooling air through the cooling air flow channel proximate the igniter.
6. The method of claim 4 , further including creating a film of cooling air exiting the cooling air flow channel against an inside surface of the combustor liner.
7. The method of claim 4 , further including cooling the grommet and combustor liner by at least 200 degrees Fahrenheit with the cooling air exiting the cooling air flow channel.