A gas turbine includes: a primary cavity inside a predetermined body and supplied with cooling air; another pit between the static body along with a rotating body; a primary cooling passage between the first and second cavities and also having a swirl flow guide nozzle there where the cooling air of the very first cavity is supplied to the next cavity while being swirled along a spinning direction of the body; another cooling passage at the rotating body, in communicating with the second pit, and supplied with the cooling air of the next cavity; along with a flow regulating passagediffers from the first cooling passing, between the first cavity and the next cavity and through the cooling air is supplied in the first pit to the second pit, whereas the flow regulating passage includes a flow regulator for controlling a flow speed of the cooling air.
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\n A gas turbine consists of a compressor, a combustor, and a turbine. The compressor compresses air, taken in through an air inlet, into high-temperature, high-pressure compressed air. The combustor produces high-temperature, high-pressurecombustion gas by supplying gas into the compressed air and combusting the mix. The turbine has pluralities of turbine vanes and turbine blades installed along a passage inside a casing, and a turbine shaft attached to a generator isdriven to rotate as the turbine blades are pushed by the combustion gasoline provided to the passage. The gas gas having pushed the turbine is discharged as exhaust gas to the air.
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\n Japanese Patent Publication No. 2011-137389 describes a gas turbine cooling passage structure having: a plurality of cooling medium flow passages which direct a cooling medium for cooling the rotating body of this gas turbine from a stationarybody supporting the rotating body and also direct the cooling medium in a rotation direction of the body; a cooling medium guide part that serves as a connection between both of the plurality of cooling medium flow passages and also constitutes a wallsurface; and a shroud part that’s disposed in at least one end part of the cooling medium guide part. The cooling passage arrangement consists of a plurality of sections each having the cooling medium guide part and the shroud part, together with theshape of a single cooling medium guide part in a minumum of one section being different from the form of the other cooling medium guide parts from the other sections, and the flow passage sectional area of the cooling medium flow passing adjoining to that onecooling medium guide part being different from the flow passage sectional area of the cooling medium flow passages set between the other cooling medium guide parts.
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Technical Problem
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\n As from the cooling flow passage structure shown in Japanese Patent Publication No. 2011-137389, it’s possible to regulate the amount of cooling air provided by adjusting the flow passage sectional area. However, the structure explained inJapanese Patent Publication No. 2011-137389 gets the work of regulating the amount of cooling air supplied complicated in addition to difficult.
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