GAS TURBINE STATOR VANE AND GAS TURBINE

WIPO Patent Application WO/2022/163030

A1

A turbine stator vane (24) comprising a vane body (40) and a shroud (60) formed at an end part of the vane body in a vane height direction, wherein the shroud comprises: a bottom plate (82) in contact with a combustion gas flow path; a circumferential wall (70) formed in the vane height direction along a circumferential edge of the bottom plate; a recess part (93) forming a space surrounded by the circumferential wall and the bottom plate; a plurality of partition ribs (90) connecting the vane body and the circumferential wall, partitioning the recess part into a plurality of spaces, and forming a plurality of cavities (100); and an impinging plate (110) dividing the space into an outer cavity (108) formed outside in the vane height direction and an inner cavity (109) formed inside the outer cavity, and including a plurality of through-holes (111) communicating between the outer cavity and the inner cavity. The circumferential wall includes: a leading edge end part extending on the leading edge side of the vane body; a negative pressure surface side end part (73) extending from the leading edge of the vane body on the negative pressure surface side to the trailing edge and internally having a negative pressure surface side passage (77); a positive pressure surface side end part (74) extending from the leading edge of the vane body on the positive pressure surface side to the trailing edge and internally having a positive pressure surface side passage (78); and a trailing edge end part extending on the trailing edge side of the vane body. The plurality of cavities include: a first cavity (103) formed from the inner cavity, disposed on a leading edge positive pressure surface side so as to surround an outer circumference of the vane body between the vane body and the circumferential wall, connected to the cooling hole formed in the bottom plate, and connected to the positive pressure surface side passage; and a fourth cavity (106) disposed adjacent to an axially downstream side of the first cavity, disposed via a first partition rib (90d), among the partition ribs, disposed on the most upstream side axially of the positive pressure surface side, and connecting the positive pressure surface of the vane body and the positive pressure surface side end part, the fourth cavity (106) including a plurality of cooling holes in the bottom plate. The opening density of the through-holes in the impinging plate of the fourth cavity is smaller than the opening density of the through-holes in the impinging plate of the first cavity.

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OKAMOTO TAKUYA (JP)
MORIKAWA TOMOKO (JP)
HADA SATOSHI (JP)

PCT/JP2021/038213

August 04, 2022

October 15, 2021

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MITSUBISHI HEAVY IND LTD (JP)
MITSUBISHI POWER LTD (JP)

F01D9/04; F02C7/18

JP6799702B1	2020-12-16
JPH0874508A	1996-03-19
JP2015105655A	2015-06-08
JP2009299601A	2009-12-24
JP2020063719A	2020-04-23

SSIP PATENT ATTORNEY CORPORATION (JP)

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