Combustor of gas turbine
A combustor of a gas turbine includes: a shell made of metal; a liner located inside the shell and made of a ceramic matrix composite, the liner including an inner surface defining a combustion chamber, an outer surface facing a side opposite to a side where the combustion chamber is located, and at least one cooling hole that is open toward the combustion chamber, and a cooling chamber defined between the shell and the liner. The shell includes a tubular shell main body and a seal wall structure projecting from an inner surface of the shell main body toward the liner.
1 . A combustor of a gas turbine,
the combustor comprising:
a shell including metal, the shell including an opening into which compressed air is introduced;
a liner located inside the shell and including a ceramic matrix composite, the liner including
an inner surface defining a combustion chamber,
an outer surface facing a side opposite to a side where the combustion chamber is located, and
at least one cooling hole that is open toward the combustion chamber; and
a cooling chamber defined between the shell and the liner, wherein
the shell includes
a tubular shell main body and
a seal wall structure projecting from an inner surface of the shell main body toward the liner;
a tip of the seal wall structure is spaced apart from the outer surface of the liner;
in a section of the cooling chamber when viewed in a circumferential direction of the combustor, the seal wall structure divides the cooling chamber into cavities
one of the cavities is interposed between the cooling hole of the liner and the opening of the shell,
the opening of the shell overlaps the cooling hole of the liner, viewed from a direction in which the seal wall structure protrudes.
2 . The combustor according to claim 1 , wherein the liner includes panels which are adjacently lined up in a circumferential direction of the combustor.
3 . The combustor according to claim 1 , further comprising a fastener by which the liner is attached to the shell, wherein:
the fastener includes a spring that allows displacement of the liner relative to the shell in a radial direction of the combustor.
4 . The combustor according to claim 3 , wherein the gap is set such that the tip of the seal wall structure is maintained to be spaced apart from the outer surface of the liner in an entire temperature range of the combustion chamber during operation of the gas turbine.
5 . The combustor according to claim 1 , wherein:
the seal wall structure includes wall portions projecting from the shell main body toward the liner; and
in the section of the cooling chamber when viewed in the circumferential direction of the combustor, the wall portions are lined up at intervals in a direction toward an end of the liner from the cavity that the cooling hole faces among the cavities.
6 . The combustor according to claim 1 , wherein in a section of the cooling chamber when viewed in a flow direction from an upstream side to a downstream side in the combustor, the seal wall structure divides the cooling chamber into further cavities.
7 . The combustor according to claim 1 , wherein:
the at least one cooling hole comprises cooling holes; and
when viewed in a direction in which the seal wall structure projects, the seal wall structure separates the cooling holes from each other.
8 . The combustor according to claim 1 , wherein the seal wall structure has a honeycomb shape, a lattice shape, or a stripe shape when viewed in a direction in which the seal wall structure projects from the shell main body.