Blade, gas turbine equipped with same, and blade manufacturing method
An end plate of a blade has a gas path surface facing a combustion gas channel side, an end surface along an edge of the gas path surface, a plurality of channels, and a skirt hole. The plurality of channels extend along the direction of a partial end surface, which is a portion of the end surface, and are arranged in a perspective direction with respect to the partial end surface. The skirt hole opens at the partial end surface. The skirt hole communicates with an inside channel, which is the channel of the plurality of channels that is farthest from the partial end surface.
1. A blade, comprising:
a blade body having an airfoil shape disposed in a combustion gas channel in which combustion gas flows; and
an end plate formed on an end portion in a blade height direction of the blade body;
the end plate including:
a gas path surface facing toward the combustion gas channel;
a reverse gas path surface facing toward an opposite of the gas path surface;
an end surface along an edge of the gas path surface;
a plurality of channels that extend in a direction along the gas path surface, disposed between the gas path surface and the reverse gas path surface; and
a skirt hole opened on a partial end surface that is a portion of the end surface,
wherein the plurality of channels are aligned in a perspective direction with respect to the partial end surface,
the skirt hole communicates with an inside channel farther from the partial end surface than an outside channel closer to the partial end surface, of the plurality of channels, and
a portion of the skirt hole overlaps with the outside channel as viewed from the blade height direction, and a position in the blade height direction of the portion of the skirt hole differs from a position in the blade height direction of the outside channel.
2. The blade according to claim 1 , wherein the skirt hole passes on a side closer to the reverse gas path surface than the outside channel.
3. The blade according to claim 2 ,
wherein the skirt hole includes a first extending part that extends from the inside channel toward the reverse gas path surface, and a second extending part that extends from an end portion closer to the reverse gas path surface toward the partial end surface, in the first extending part.
4. The blade according to claim 2 ,
wherein the skirt hole includes a tilted hole part that gradually approaches the reverse gas path surface when approaching the partial end surface from the inside channel.
5. The blade according to claim 2 , wherein
the inside channel has an expanded part that expands more toward the reverse gas path surface than the outside channel, and
the skirt hole communicates with the expanded part of the inside channel.
6. The blade according to claim 1 , further comprising a plug that blocks the opening of the skirt hole in the partial end surface.
7. The blade according to claim 6 , wherein the plug includes a through hole that externally discharges cooling air in the skirt hole.
8. The blade according to claim 1 , wherein
each of the plurality of channels extends in the direction along the partial end surface and communicates with a channel that is adjacent in the perspective direction, at an end in the direction along the partial end surface, and
the plurality of channels mutually communicate forming one serpentine channel.
9. A gas turbine, comprising:
a plurality of the blades according to claim 1 ;
a rotor shaft to which a plurality of blades are attached;
a casing that covers the plurality of blades and the rotor shaft; and
a combustor that transfers combustion gas to a region where the plurality of blades are disposed in the casing.