Seal structure
A seal structure includes: a first member and a second member facing a combustion gas flow passage; a third member on an outer side of the combustion gas flow passage; a heat-resistant coating on at least one of a first end face and a second end face, both of the first end face and the second end face being closer to the combustion gas flow passage; and a contact part in each of the first end face and the second end face, further on the outer side of the combustion gas flow passage than the heat-resistant coating. The contact part is configured to restrict relative movement of the first member and the second member by directly or indirectly coming into contact with the first member and the second member in a state where a clearance is left between the heat-resistant coating and the end face facing the heat-resistant coating.
1. A seal structure comprising:
a first member facing a combustion gas flow passage defined around a rotor axis;
a second member facing the combustion gas flow passage and being adjacent to the first member;
a third member on an outer side of the combustion gas flow passage between a first end face of the first member facing downstream and a second end face of the second member facing the first end face, the third member being configured to engage with the first member and the second member;
a heat-resistant coating on at least one of the first end face and the second end face, both of the first end face and the second end face being closer to the combustion gas flow passage with respect to the third member; and
a contact part in each of the first end face and the second end face, further on the outer side of the combustion gas flow passage than the heat-resistant coating, the contact part being configured to, when the first member and the second member move relatively toward each other, restrict relative movement of the first member and the second member by directly coming into contact with the first member and the second member, or indirectly coming into contact with the first member and the second member through the third member, in a state where a clearance is left between the heat-resistant coating and at least one of the first end face and the second end face facing the heat-resistant coating,
wherein the first member is a combustor,
wherein the second member is a vane on a downstream side in a rotor axis direction relative to the combustor,
wherein the third member is a seal member on the outer side of the combustion gas flow passage, and
wherein the seal member includes:
cooling channels defined in a region extending in a circumferential direction based on the rotor axis, at positions including a position on an upstream side in the rotor axis direction relative to a leading edge of the vane facing the upstream side in the rotor axis direction; and
a third end face having a plurality of openings defined in the circumferential direction and configured to discharge cooling air from the cooling channels, the third end face facing downstream.
2. The seal structure according to claim 1 , wherein the seal member includes a clearance forming portion that protrudes from the third end face toward the downstream side in the rotor axis direction and that has a fourth end face facing the downstream side in the rotor axis direction.
3. The seal structure according to claim 2 , wherein the fourth end face faces the contact part of the second end face of the vane facing the upstream side in the rotor axis direction.