Gas turbine engine airfoil component platform seal cooling
A gas turbine engine component array includes first and second components each having a platform. The platforms are arranged adjacent to one another and provide a gap. A seal is arranged circumferentially between the first and second components and in engagement with the platforms to obstruct the gap. A cooling hole is provided in the seal and is in fluid communication with the gap. The cooling hole has an increasing taper toward the gap.
1. A gas turbine engine component array comprising:
first and second components each having a platform, the platforms are arranged adjacent to one another and provide a gap circumferentially between axially lateral faces of the adjacent platforms; and
a seal is arranged circumferentially between the first and second components and in engagement with the platforms to obstruct the gap, a cooling hole is provided in the seal and is in fluid communication with the gap, the cooling hole has an increasing taper toward the gap, wherein the lateral faces overlap the cooling hole in a circumferential direction, the cooling hole having a circumferential width that is larger than the width of the gap.
2. The gas turbine engine component array according to claim 1 , wherein the seal includes a gas path flow side engaging the platforms, and another side arranged opposite the gas path flow side and facing a cavity provided between the first and second components, the cooling hole configured to fluidly connect the cavity to the gap.
3. The gas turbine engine component array according to claim 2 , wherein the seal is a damper seal arranged in a pocket arranged beneath the platforms.
4. The gas turbine engine component array according to claim 2 , wherein the seal extends circumferentially and axially between the lateral faces of the platforms to obstruct the gap.
5. The gas turbine engine component array according to claim 4 , wherein a slot is provided in each of the lateral faces, and the seal is a feather seal arranged within the slots.
6. The gas turbine engine component array according to claim 1 , wherein the cooling hole is arranged at an acute angle with respect to the gas path flow side, the cooling hole extending generally in a lengthwise direction of the gap.
7. The gas turbine engine component array according to claim 6 , wherein the cooling hole includes a metering portion and a diffuser portion.
8. The gas turbine engine component array according to claim 7 , wherein the metering portion has a length L and a diameter D, the metering portion having an L/D ratio of greater than 1.
9. The gas turbine engine component array according to claim 8 , wherein the L/D ratio is greater than 3.
10. The gas turbine engine component array according to claim 7 , wherein the diffuser portion includes a height, and the circumferential width is greater than the height, the circumferential width arranged in the circumferential direction.
11. The gas turbine engine component array according to claim 1 , wherein the first and second components are blade outer airseals or turbine blades.
12. A method of cooling a gas turbine engine component array comprising the steps of:
providing cooling fluid to a cavity between adjacent components that provide a gap circumferentially between axially lateral faces of the adjacent components;
flowing cooling fluid from the cavity through a cooling hole in a seal provided between the adjacent components, wherein the seal is arranged circumferentially between the adjacent components, and the lateral faces overlap the cooling hole in a circumferential direction, the cooling hole having a circumferential width that is larger than the gap; and
diffusing the cooling fluid through the cooling hole on a gas path flow side of the seal opposite the cavity to create a cooling film in the gap provided between adjacent platforms of the components.
13. The method according to claim 12 , wherein the cooling hole is arranged at an acute angle with respect to the gas path flow side, the cooling hole extending generally in a lengthwise direction of the gap, the cooling hole includes a metering portion and a diffuser portion.
14. The method according to claim 13 , wherein the metering portion has a length L and a diameter D and an L/D ratio of greater than 1, the diffuser portion includes a height, and the circumferential width is greater than the height, the circumferential width arranged in the circumferential direction.
15. The method according to claim 12 , wherein the adjacent components are blade outer airseals or turbine blades.