To improve durability by engaging a guide member with a guide groove having play, in a device wherein a moving blade is enclosed by a circumferential wall ring composed of many circumferential segments, and a ring shaped circumferential wall cooling chamber is formed between the circumferential wall ring and a U-shaped cross sectional guide member.
A first high pressure turbine stage of a gas turbine is composed of a moving blade 110 and a stator blade 120, and the moving blade 110 is enclosed by a circumferential wall ring composed of many circumferential wall segments 10 in the radial direction. Each circumferential wall segment is disposed to a support body segment 20 fixed to a casing 100, and air is supplied to a restriction air supplying chamber 25 regulated by a guide member 30 bypassing an air supplying passage 26 penetrating the inside of the support body segment 20 in the nearly radial direction. The guide member 30 is formed in a U-shape provided with two webs 32, those webs 32 are loosely engaged with an inside of the guide groove 22 of the support body segment 20 in the axial direction having small play, and thermal stress can be absorbed.
WELLENKAMP ULRICH
NAGLER CHRISTOPH
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