WO2015198840A1 - 動翼、及びこれを備えているガスタービン - Google Patents
動翼、及びこれを備えているガスタービン Download PDFInfo
- Publication number
- WO2015198840A1 WO2015198840A1 PCT/JP2015/066367 JP2015066367W WO2015198840A1 WO 2015198840 A1 WO2015198840 A1 WO 2015198840A1 JP 2015066367 W JP2015066367 W JP 2015066367W WO 2015198840 A1 WO2015198840 A1 WO 2015198840A1
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- WO
- WIPO (PCT)
- Prior art keywords
- passage
- ventral
- end surface
- blade
- platform
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
- F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/187—Convection cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/16—Cooling of plants characterised by cooling medium
- F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/80—Platforms for stationary or moving blades
- F05D2240/81—Cooled platforms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/204—Heat transfer, e.g. cooling by the use of microcircuits
Definitions
- the present invention relates to a moving blade and a gas turbine including the same.
- This application claims priority based on Japanese Patent Application No. 2014-132866 filed in Japan on June 27, 2014, the contents of which are incorporated herein by reference.
- the rotor of the gas turbine has a rotor shaft and a plurality of moving blades attached to the rotor shaft.
- the rotor blades are formed on a radially extending blade body with respect to the rotor shaft, on a radially inner side of the blade body, defining a part of a combustion gas passage through which combustion gas flows, and on a radially inner side of the platform.
- a blade root attached to the rotor shaft.
- the rotor blades are exposed to high-temperature combustion gas, for example, as described in Patent Document 1 below, the rotor blades are cooled by cooling air.
- the blade body, the platform, and the blade root are formed with a plurality of blade air passages that extend in a radial direction with respect to the rotor shaft and that are connected to each other in the blade body and the platform and through which cooling air flows.
- the plurality of blade air passages are arranged along the chord of the wing body.
- the extending direction of the rotor shaft is defined as the axial direction
- the radial direction relative to the rotor shaft is simply referred to as the radial direction
- the circumferential direction relative to the rotor shaft is simply referred to as the circumferential direction.
- the side in which the combustion gas flows in the axial direction is the downstream side
- the opposite side is the upstream side.
- a plurality of passages extending in the circumferential direction from the plurality of blade air passages and arranged in the axial direction are formed.
- Each of the plurality of passages is open at the end face on the platform side in the circumferential direction.
- a plurality of passages extending in the circumferential direction from the plurality of blade air passages and arranged in the axial direction are formed in the platform.
- Each of the plurality of passages is open at the end surface on the back side in the circumferential direction of the platform.
- the moving blade it is desired to reduce the amount of air used for cooling the moving blade as much as possible while effectively cooling the moving blade to improve the durability of the moving blade.
- an object of the present invention is to provide a moving blade capable of suppressing the amount of cooling air used while improving durability and a gas turbine including the same.
- a moving blade as one aspect according to the invention for achieving the above object is as follows: In the rotor blade attached to the outer peripheral side of the rotor shaft, a blade body extending in the radial direction with respect to the rotor shaft and a radially inner side of the combustion gas passage formed in the radial direction of the blade body and through which combustion gas flows are defined. A blade air passage that extends in the radial direction and extends through the blade body and the platform and through which cooling air flows.
- a rear end surface which is an axial direction in which the rotor shaft extends and the combustion gas flows, and an end surface on the downstream side in the axial direction; and a front end surface, which is an end surface on the upstream side in the axial direction opposite to the downstream side in the axial direction
- a ventral side end surface which is a circumferential direction ventral side end surface which is the ventral side of the wing body in a circumferential direction with respect to the rotor shaft, and a circumferential back side end surface which is opposite to the circumferential direction ventral side.
- a back side mother passage that is a mother passage located on the back side in the circumferential direction from the wing body, and the axial direction along the back side end surface from the back side mother passage, communicating with the back side mother passage And a dorsal passage extending in the direction having the components.
- a plurality of ventral passages are formed in the platform on the ventral side in the circumferential direction, and the flow rate of cooling air for cooling the part is increased to suppress the thermal stress in this part.
- a back-side mother passage and a back-side passage communicating with the back-side mother passage are formed in the portion on the back side in the circumferential direction in the platform, and the flow rate of cooling air for cooling this portion is reduced.
- each of the cross-sectional areas of the plurality of ventral-side passages is smaller than the cross-sectional area of the back-side passage, and the total area of the cross-sectional areas of the plurality of ventral-side passages is It may be larger than the cross-sectional area of the side passage.
- the cross-sectional area of the passage is a cross-sectional area in a plane perpendicular to the longitudinal direction of the passage.
- a plurality of ventral passage openings are formed at intervals from the axial upstream side of the ventral end surface to the axial downstream side, and the ventral end surface is formed.
- the interval between the openings of the ventral passage adjacent to each other in the axial upstream portion may be narrower than the interval between the openings of the ventral passage adjacent in the axial intermediate portion of the ventral end surface.
- the portion on the far side in the circumferential direction and the upstream side in the axial direction from the blade body can be cooled more than the portion on the far side in the circumferential direction from the blade body and in the axial direction.
- the opening of the ventral passage adjacent to the upstream end portion of the ventral end surface in the axial direction is narrow, and the ventral passage adjacent to the upstream portion of the ventral end surface in the axial direction is provided.
- the openings may have different radial positions.
- a plurality of ventral passage openings are formed at intervals from the axial upstream side of the ventral end surface to the axial downstream side, and the ventral end surface is formed.
- the interval between the openings in the ventral passage adjacent to each other in the axial downstream side portion may be narrower than the interval between the openings in the ventral passage adjacent in the intermediate portion in the axial direction of the ventral end surface.
- the portion on the far side in the circumferential direction and the downstream side in the axial direction from the blade body can be cooled more than the middle portion in the circumferential direction on the far side from the blade body and in the axial direction.
- the blade body and the platform are formed with a plurality of the blade air passages extending in the radial direction side by side along a chord of the blade body
- the platform includes a front mother passage that is a mother passage extending toward the upstream side in the axial direction from the first blade air passage on the most upstream side in the axial direction among the plurality of blade air passages.
- One or more abdominal front passages extending from the front mother passage toward the abdomen end surface in the circumferential direction and opening at the abdominal end surface; and extending from the front mother passage toward the upstream side in the axial direction and opening at the front end surface.
- One or more front ventral passages may be formed.
- the cooling air supply of these passages is provided.
- the mutual distance between the sides can be widened. For this reason, in the moving blade, the number of these passages can be increased while maintaining the workability, thereby enhancing the cooling of the platform.
- the platform includes a plurality of the ventral front passages arranged in the axial direction, and the interval between the openings of the front ventral passages adjacent to each other on the ventral end surface is
- the opening of the ventral passage adjacent to the middle portion of the ventral end surface in the axial direction may be narrower than each other.
- the portion on the far side in the circumferential direction and the upstream side in the axial direction from the blade body can be cooled more than the portion on the far side in the circumferential direction from the blade body and in the axial direction.
- the platform includes a plurality of front ventral passages arranged in the circumferential direction and adjacent to each other at the front end surface.
- path may be narrower than the mutual space
- the portion on the upstream side in the axial direction from the blade body in the platform can be cooled more on the ventral side in the circumferential direction than the blade body and more than the intermediate portion in the axial direction.
- the platform has a plurality of openings extending from the first blade air passage toward the upstream side in the axial direction and opening at the front end surface.
- a front passage is formed, and an interval between the openings of the front passage adjacent to each other at the front end surface may be narrower than an interval between the openings of the ventral passage adjacent at the axial intermediate portion of the ventral end surface. Good.
- the portion on the upstream side in the axial direction from the blade body in the platform can be cooled more on the ventral side in the circumferential direction than the blade body and more than the intermediate portion in the axial direction.
- the opening of the ventral passage adjacent to the upstream end portion of the ventral end surface is narrow, or the opening of the ventral front passage adjacent to the ventral end surface is narrow.
- the shortest distance between the front edge portion of the blade body and the ventral side end surface may be shorter than the shortest distance between the back side portion of the blade body and the back side end surface. Good.
- the interval between the openings of the front ventral passages adjacent to each other at the front end surface is narrow or the interval between the openings of the front passage adjacent to the front end surface is narrow.
- the shortest distance between the front edge of the body and the front end surface may be shorter than the shortest distance between the back portion of the wing body and the back end surface.
- the portion on the upstream side in the axial direction of the blade body tends to be hot in the platform. Therefore, in such a case, by adopting a configuration in which the portion on the upstream side in the axial direction of the wing body can be cooled more on the far side in the circumferential direction than the wing body and on the intermediate portion in the axial direction, By reducing the temperature of the portion on the side, high-temperature oxidation of this portion can be suppressed.
- a cross-sectional area of the back-side mother passage may be larger than a cross-sectional area of the back-side passage.
- the pressure loss of the cooling air flowing into the back side passage through the back side mother passage can be reduced. Further, in the moving blade, the flow rate of the cooling air passing through the back passage is increased, so that the heat transfer coefficient of the back passage can be increased. Therefore, according to the moving blade, the back side portion of the platform can be efficiently cooled.
- a plurality of the blade air passages extending in the radial direction are formed in the blade body and the platform along a chord of the blade body, and the back side
- the mother passage may extend from the first blade air passage on the upstream side in the axial direction among the plurality of blade air passages toward the back side in the circumferential direction.
- any one of the above-described moving blades on the radially inner side of the platform, on the upstream side in the axial direction and on the back side in the circumferential direction with respect to the blade body, facing the radially outer side.
- a recessed portion into which cooling air flows is formed in a recess, and the back-side mother passage may extend from the recessed portion toward the circumferential back side.
- the blade body and the platform are formed with a plurality of the blade air passages extending in the radial direction side by side along a chord of the blade body,
- the back-side mother passage may extend from the second second blade air passage toward the back side in the circumferential direction from the axially upstream side among the plurality of blade air passages.
- the backside mother passage extends from the recess or the second cooling passage.
- a plurality of the blade air passages extending in the radial direction include the blade.
- a plurality of the platform are formed side by side along the chords of the body, and the platform includes a plurality of the first dorsal passage and the first dorsal passage.
- a second back side mother passage that is a mother passage that extends from the first blade air passage on the most upstream side in the axial direction toward the back side in the circumferential direction, and the back from the second back side mother passage.
- a plurality of second dorsal passages extending toward the side end surface and opening at the dorsal end surface may be formed.
- the main passage opens at an end surface of the platform, the opening is closed by a lid, and the lid and an edge of the opening are joined to each other.
- a through-hole penetrating from the inside of the main passage to the outside of the platform may be formed.
- the periphery of the opening of the mother passage can be cooled in the end face of the platform. Further, in the moving blade, since the joint portion between the edge of the opening and the lid is cooled, the joint reliability of the joint portion can be improved.
- the platform in addition to the first ventral passage, which is the ventral passage, the platform extends from the blade air passage toward the ventral side in the circumferential direction.
- a second ventral passage may be formed that opens at a gas path surface in contact with the combustion gas.
- the moving blade can cool the film on the gast surface of the platform on the side farther in the circumferential direction than the blade body.
- a gas turbine as one aspect according to the invention for achieving the above object is as follows: Any one of the plurality of moving blades described above, the rotor shaft to which the plurality of moving blades are attached, and a turbine casing that rotatably covers a turbine rotor that includes the plurality of moving blades and the rotor shaft.
- a combustor that burns fuel to generate the combustion gas.
- FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is a top view of the moving blade in one embodiment concerning the present invention.
- FIG. 7 is a sectional view taken along line VII-VII in FIG. 6.
- FIG. 7 is a sectional view taken along line VIII-VIII in FIG. 6. It is a top view of a moving blade in the 1st modification of one embodiment concerning the present invention.
- FIG. 10 is a view taken in the direction of arrow X in FIG. 9. It is a top view of the moving blade in the 2nd modification of one Embodiment which concerns on this invention. It is a top view of a moving blade in the 3rd modification of one embodiment concerning the present invention. It is principal part sectional drawing of the moving blade in the 3rd modification of one Embodiment which concerns on this invention. It is a top view of the moving blade in the 4th modification of one embodiment concerning the present invention. It is a top view of a moving blade in the 5th modification of one embodiment concerning the present invention. It is a top view of a moving blade in the 6th modification of one embodiment concerning the present invention.
- FIG. 20 is a sectional view taken along line XX-XX in FIG. It is a top view of the moving blade in the 9th modification of one Embodiment concerning this invention. It is a top view of the moving blade in the 10th modification of one Embodiment concerning this invention.
- the gas turbine 10 of this embodiment includes a compressor 20 that compresses air, a combustor 30 that generates fuel by burning fuel in the air compressed by the compressor 20, and a turbine 40 that is driven by the combustion gas. And.
- the compressor 20 includes a compressor rotor 21 that rotates about an axis Ar, a compressor casing 25 that rotatably covers the compressor rotor 21, and a plurality of stationary blade stages 26.
- the turbine 40 includes a turbine rotor 41 that rotates about an axis Ar, a turbine casing 45 that rotatably covers the turbine rotor 41, and a plurality of stationary blade stages 46.
- the compressor rotor 21 and the turbine rotor 41 are located on the same axis Ar and are connected to each other to form the gas turbine rotor 11.
- a generator rotor (not shown) is connected to the gas turbine rotor 11.
- the compressor casing 25 and the turbine casing 45 are connected to each other to form a gas turbine casing 15.
- the direction in which the axis Ar extends is referred to as the axial direction Da
- the circumferential direction around the axis Ar is simply referred to as the circumferential direction Dc
- the direction perpendicular to the axis Ar is referred to as the radial direction Dr.
- the compressor 20 side is the upstream side and the opposite side is the downstream side with respect to the turbine 40 in the axial direction Da.
- the compressor rotor 21 includes a rotor shaft 22 that extends in the axial direction Da along the axis Ar, and a plurality of blade stages 23 that are attached to the rotor shaft 22.
- the plurality of blade stages 23 are arranged in the axial direction Da.
- Each rotor blade stage 23 is composed of a plurality of rotor blades 23a arranged in the circumferential direction Dc.
- a stationary blade stage 26 is disposed on each downstream side of the plurality of blade stages 23.
- Each stationary blade stage 26 is provided inside the compressor casing 25.
- Each stator blade stage 26 is configured by a plurality of stator blades 26a arranged in the circumferential direction Dc.
- the turbine rotor 41 includes a rotor shaft 42 extending in the axial direction Da along the axis Ar, and a plurality of rotor blade stages 43 attached to the rotor shaft 42.
- the plurality of blade stages 43 are arranged in the axial direction Da.
- Each rotor blade stage 43 is composed of a plurality of rotor blades 50 arranged in the circumferential direction Dc.
- a stationary blade stage 46 is disposed on each upstream side of the plurality of blade stages 43.
- Each stationary blade stage 46 is provided inside the turbine casing 45.
- Each stationary blade stage 46 is configured by a plurality of stationary blades 46a arranged in the circumferential direction Dc.
- the turbine casing 45 has a cylindrical turbine casing main body 45a that constitutes an outer shell thereof, and a plurality of split rings 45b that are fixed to the inside thereof.
- the plurality of split rings 45 b are all provided at positions between the plurality of stationary blade stages 46. Therefore, the rotor blade stage 43 is arranged on the radially inner side of each divided ring 45b.
- An annular space between the outer peripheral side of the rotor shaft 42 and the inner peripheral side of the turbine casing 45 and in which the stationary blades 46 a and the moving blades 50 are arranged in the axial direction Da is from the combustor 30.
- a combustion gas flow path 49 through which the combustion gas G flows is formed.
- the rotor shaft 42 is formed with a cooling air passage 42p through which cooling air passes. The cooling air that has passed through the cooling air passage 42p is introduced into the moving blade 50 and used for cooling the moving blade 50.
- the moving blade 50 is formed on a wing body 51 extending in the radial direction Dr, a platform 61 formed on the radially inner side of the wing body 51, and a diametrically inner side of the platform 61. And a blade root 59 provided inside the shank 58 in the radial direction. A region outside the platform 61 in the radial direction, that is, a region where the blade body 51 exists forms a combustion gas passage through which the combustion gas G from the combustor 30 passes.
- the end portion on the upstream side in the axial direction forms a front edge portion 52, and the end portion on the downstream side in the axial direction forms a rear edge portion 53.
- the wing body 51 is smoothly convex toward one side in the circumferential direction Dc.
- the upstream side in the axial direction Da may be referred to as the front side
- the downstream side in the axial direction Da may be referred to as the rear side.
- the blade root 59 has a Christmas tree shape in which a cross-sectional shape perpendicular to the chord of the wing body 51 has a widened portion and a narrowed portion alternately repeated inward in the radial direction.
- the rotor shaft 42 is formed with a blade root groove into which the blade root 59 is fitted.
- the platform 61 includes a front end surface 62 that is an end surface on the upstream side in the axial direction, a rear end surface 63 that is an end surface on the downstream side in the axial direction, a ventral end surface 64 that is an end surface on the ventral side in the circumferential direction, and an end surface on the back side in the circumferential direction.
- the back side end surface 65 is formed.
- the front end face 62 and the rear end face 63 are substantially parallel.
- the ventral side end face 64 and the back side end face 65 are substantially parallel. Therefore, when viewed from the radial direction Dc, the platform 61 has a parallelogram shape as shown in FIG.
- the ventral side end face 64 of one platform 61 and the back side end face 65 of the other platform 61 face each other.
- the platform 61 is formed with a gas path surface 66 that is a radially outer surface and an inner surface 67 that is a radially inner surface.
- the gas path surface 66 forms a part on the radially inner side of the surface that defines the combustion gas flow path, and contacts the combustion gas.
- a plurality of blade air passages 71 extending in the radial direction Dc are formed in the moving blade 50. Specifically, seven blade air passages 71 are formed in the moving blade 50 of the present embodiment. Although seven examples are shown as the number of blade air passages 71, the present invention is not limited to this.
- Each blade air passage 71 is formed continuously from at least the blade body 51 to the platform 61 among the blade body 51, the platform 61, the shank 58, and the blade root 59.
- the plurality of blade air passages 71 are arranged along the chord of the wing body 51. A part of the adjacent blade air passages 71 communicate with each other at a radially outer portion in the blade body 51 or a radially inner portion of the platform 61.
- Any one of the plurality of blade air passages 71 is formed continuously from the blade body 51, the platform 61, the shank 58, and the blade root 59, and is open at the radially inner end of the blade root 59. Cooling air that has passed through the cooling air passage 42p of the rotor shaft 42 flows into the blade air passage 71 from this opening.
- the blade body 51 is formed with a blade front end passage 56 that extends upstream from the most upstream first blade air passage 71 a among the plurality of blade air passages 71 and opens at the leading edge 52 of the blade body 51. ing.
- the platform 61 includes a plurality of ventral passages 72 extending from the respective blade air passages 71 toward the ventral side in the circumferential direction Dc, and a front side from the first blade air passage 71a.
- a plurality of front passages 79 extending, a back mother passage 73 extending from the first blade air passage 71a toward the circumferential back side, and an axial direction downstream from the back mother passage 73 along the back end face 65
- a dorsal passage 74 extending in the direction having the components.
- the plurality of ventral passages 72 are arranged in the axial direction Da. Each ventral passage 72 opens at the ventral end surface 64 of the platform 61. Each of the plurality of front passages 79 is open at the front end face 62 of the platform 61.
- the back-side mother passage 73 opens at the back-side end face 65 of the platform 61. This opening is closed by a lid 85, and the lid 85 and the edge of the opening are joined.
- the back-side mother passage 73 is formed by machining, electric discharge machining, or the like from the back-side end face 65 of the intermediate casting product of the rotor blade 50 in which the plurality of blade air passages 71 are formed.
- the opening of the back side end face 65 in the back side mother passage 73 is closed with a lid 85, and the lid 85 and the edge of the opening are joined by brazing or the like.
- the back passage 74 is open at the rear end face 63 of the platform 61.
- the cross-sectional area a2 of the backside mother passage 73 is substantially the same as the cross-sectional area a3 of the backside passage 74. Further, each of the cross-sectional areas a1 of the plurality of ventral-side passages 72 is smaller than the cross-sectional area a2 of the back-side mother passage 73 and the cross-sectional area a3 of the back-side passage 74. However, the total area of the cross-sectional areas a1 of the plurality of ventral passages 72 is larger than the cross-sectional area a2 of the back-side mother passage 73 and the cross-sectional area a3 of the back-side passage 74. In addition, all the cross-sectional areas of each channel
- the cooling air that has passed through the cooling air passage 42p of the rotor shaft 42 is a blade air passage that is open at the radially inner end of the blade root 59 among the plurality of blade air passages 71 formed in the rotor blade 50. 71 flows in.
- the cooling air that has flowed into the blade air passage 71 flows into a blade cooling passage adjacent to the blade air passage 71 in some cases.
- the cooling air exchanges heat with the blade body 51 and the like to cool the blade body 51 and the like.
- the blade air passage 71 a part of the cooling air flowing into the first blade air passage 71 a on the most upstream side flows out from the plurality of blade front end passages 56 of the blade body 51 to the combustion gas flow path. Further, out of the blade air passage 71, it flows out from the seventh blade air passage 71 b on the most downstream side to the combustion gas passage. Therefore, the front edge portion 52 and the rear edge portion 53 of the wing body 51 are cooled by these cooling airs.
- a part of the cooling air flowing into the first blade air passage 71a passes through the front passage 79 of the platform 61 communicating with the first blade air passage 71a and is formed on the front end surface 62 of the platform 61. It flows out of the platform 61 from the opening of the passage 79. Accordingly, a portion of the gas path surface 66 of the platform 61 that is located radially outside the front passage 79 is cooled by the cooling air that passes through the front passage 79. Further, a portion of the front end surface 62 of the platform 61 around the opening of the front passage 79 is cooled by the cooling air flowing out from the opening.
- the other part of the cooling air flowing into the first blade air passage 71 a passes through the ventral passage 72 of the platform 61 and passes through the opening of the ventral passage 72 formed in the ventral end surface 64 of the platform 61. Flows out.
- a part of the cooling air flowing into the other blade air passage 71 is also formed on the ventral end surface 64 of the platform 61 through the ventral passage 72 of the platform 61 communicating with the blade air passage 71. It flows out of the platform 61 from the opening of the ventral passage 72. Accordingly, a portion of the gas path surface 66 of the platform 61 located on the radially outer side of the ventral passage 72 is cooled by the cooling air passing through the ventral passage 72. Further, the portion around the opening of the ventral passage 72 in the ventral end surface 64 of the platform 61 is cooled by the cooling air flowing out from the opening.
- Still another part of the cooling air flowing into the first blade air passage 71 a passes through the back side mother passage 73 and the back side passage 74 of the platform 61 and is formed on the rear end surface 63 of the platform 61. It flows out of the platform 61 from the opening of the passage 74. Therefore, a portion located on the radially outer side of the backside mother passage 73 and a portion located on the radially outer side of the backside passage 74 in the gas path surface 66 of the platform 61 are connected to the backside mother passage 73 and the backside passage 74. Cooled by the passing cooling air. Further, in the rear end face 63 of the platform 61, the portion around the opening of the back passage 74 is cooled by the cooling air flowing out from this opening.
- the platform 61 tends to thermally expand in various directions when heated by the combustion gas. Since the portion on the circumferential side in the platform 61 with respect to the wing body 51 is surrounded by the abdominal side surface 54 of the wing body 51 that is recessed toward the back side in the circumferential direction, The thermal expansion of the portion is restricted to some extent by the wing body 51. On the other hand, with respect to the wing body 51 in the platform 61, the portion on the back side in the circumferential direction is not surrounded by the wing body 51. Therefore, the thermal expansion of the portion on the back side in the circumferential direction is not significantly restricted by the wing body 51. .
- the thermal stress generated in the circumferentially ventral portion of the platform 61 with respect to the wing body 51 is higher than the thermal stress generated in the circumferentially dorsal portion.
- a plurality of ventral passages 72 are formed in the circumferentially ventral portion of the platform 61, the flow rate of cooling air for cooling the portion is increased, and the thermal stress in this portion is increased. It is suppressed.
- one back side mother passage 73 and one back side passage 74 communicating therewith are formed in the portion on the back side in the circumferential direction in the platform 61, and the back end face 65 of the platform 61 that tends to rise in temperature. By cooling only the vicinity, the flow rate of the cooling air is reduced.
- the cross-sectional area a1 of the plurality of ventral passages 72 is set to the dorsal mother while increasing the flow rate of the cooling air for cooling the circumferential ventral portion in the platform 61.
- the flow velocity of the air flowing through the plurality of ventral passages 72 is increased, and the cooling efficiency of the circumferential ventral portion is improved. Yes.
- the amount of cooling air used can be suppressed while improving the durability of the moving blade 50.
- the moving blade 50a of the present modified example is obtained by increasing the number of the ventral passages 72 and the front passages 79 communicating with the first blade air passage 71a of the moving blade 50 of the above embodiment, and other configurations are as described above. It is the same as the moving blade 50 of the form.
- the platform 61a of the present modified example also has a plurality of ventral passages 72 extending from the first blade air passage 71a toward the ventral side in the circumferential direction and opening at the ventral end surface 64 of the platform 61a. Is formed.
- the plurality of ventral passages 72 are arranged in the axial direction Da.
- the number of the ventral passages 72 extending from the first blade air passage 71a toward the circumferential ventral side is the ventral side extending from the first blade air passage 71a toward the circumferential ventral side in the above embodiment. More than the number of passages 72.
- a plurality of front passages 79 extending forward from the first blade air passage 71a and opening at the front end face 62 of the platform 61a are formed as in the above embodiment. .
- the plurality of front passages 79 are arranged in the circumferential direction Dc. As described above, the number of the front passages 79 extending from the first blade air passage 71a to the front side is larger than the number of the front passages 79 extending from the first blade air passage 71a toward the front side in the above-described embodiment.
- the mutual interval of the openings of the ventral passages 72 adjacent to each other in the front portion in the ventral end surface 64 of the platform 61a is adjacent to the middle portion in the axial direction Da in the ventral end surface 64. Narrower than the interval between the openings of the side passages 72.
- path 79 adjacent on the front end surface 62 of the platform 61a is the opening of the ventral side channel
- the heat transfer coefficient is high because the boundary layer is thin. Therefore, with respect to the wing body 51 in the platform 61a, the portion on the front side in the circumferential direction becomes a high temperature due to a high heat transfer coefficient and tends to expand greatly.
- the distance between the front edge portion 52 of the wing body 51 and the ventral end surface 64 of the platform 61a is narrower than the interval between the intermediate portion of the wing body 51 and the ventral end surface 64 of the platform 61a.
- the thermal expansion of the portion on the front side in the direction is strongly restrained by the wing body 51. Therefore, the thermal stress accompanying the start / stop of the gas turbine is increased at the front side in the circumferential direction, and the life is shortened due to low cycle fatigue.
- the number of front ventral passages 72 is made larger than the number of front ventral passages 72 in the above embodiment, and this portion is made more than in the above embodiment. It also cools and suppresses thermal stress in this part.
- the shortest distance L2 between the front edge portion 52 of the wing body 51 and the front end surface 62 of the platform 61a is greater than the shortest distance L3 between the back side surface 55 of the wing body 51 and the back side end surface 65 of the platform 61a.
- the temperature of the front side in the platform 61a on the front side in the circumferential direction is close to the front edge portion 52 that is high in the wing body 51, and the temperature tends to be high. Yes, life is shortened by high temperature oxidation thinning due to this.
- the number of the ventral front passages 79 is made larger than the number of the ventral front passages 79 in the above embodiment, and this portion is used in the above embodiment. It cools down more and suppresses the high temperature oxidation thinning of this part.
- the interval between the axial directions Da in the adjacent ventral passages 72 in the axial direction Da is narrowed.
- the strength around the plurality of ventral passages 72 may be lower than the target strength.
- the method of preventing the strength reduction around the plurality of front passages 79 when the number of the ventral passages 72 is increased has been described.
- the plurality of front sides 79 Of the passages 79 similarly, the plurality of front sides 79 Of the passages 79, the positions of the openings of the front passages 79 adjacent in the circumferential direction Dc may be different from each other in the radial direction Dr.
- the moving blade 50b of this modification is obtained by increasing the number of ventral passages 72 communicating with the seventh blade air passage 71b of the moving blade 50 of the above embodiment, and other configurations are the moving blades of the above embodiment. Same as 50.
- the platform 61b of the present modification also has a plurality of ventral passages extending from the seventh blade air passage 71b toward the ventral side in the circumferential direction Dc and opening at the ventral end surface 64 of the platform 61b. 72 is formed.
- the plurality of ventral passages 72 are arranged in the axial direction Da.
- path 72 adjacent in the axial direction downstream side part in the abdominal side end surface 64 of the platform 61b is the intermediate part of the axial direction Da in this abdominal side end surface 64. It is narrower than the interval between the openings of the adjacent ventral passages 72.
- the flow of combustion gas is accelerated by the wing body 51 in the vicinity of the rear edge 53 of the wing body 51 in the platform 61b.
- the vicinity of the rear edge portion 53 of the blade body 51 has a higher heat transfer coefficient than the vicinity of the intermediate portion of the blade body 51 in the platform 61b.
- the distance between the rear edge portion 53 of the wing body 51 and the ventral end surface 64 of the platform 61b is narrower than the distance between the intermediate portion of the wing body 51 and the ventral end surface 64 of the platform 61b.
- the number of the rear ventral passages 72 is made larger than the number of the rear ventral passages 72 in the above-described embodiment, and this portion is implemented as described above. It cools more than the form and suppresses thermal stress in this part.
- the plurality of ventral passages 72 are adjacent in the axial direction Da.
- the positions of the openings of the ventral passage 72 may be different from each other in the radial direction Dr.
- the moving blade 50c of this modification is a modification of the moving blade 50a of the first modification.
- all the passages that open at the front side portion of the ventral end surface 64 of the platform 61a are ventral passages 72 that extend radially from the first blade air passage 71a.
- all the passages opened in the front end face 62 of the platform 61a in the moving blade 50a of the first modification are all the front passages 79 extending from the first blade air passage 71a to the upstream side in the radial direction Dr.
- the platform 61c of the present modification includes a front mother passage 75 that extends from the first blade air passage 71a toward the front side in the circumferential direction and extends toward the front side, and a ventral end surface that extends from the front side mother passage 75 toward the front side in the circumferential direction.
- a plurality of front abdominal passages 76 opened at 64 and a plurality of front abdominal passages 77 extending from the front mother passage 75 toward the front and opening at the front end face 62 are formed.
- the platform 61c of the present modified example includes a plurality of ventral passages 72 extending from the first blade air passage 71a toward the ventral side in the circumferential direction, as in the above embodiment, the first and second modified examples, A plurality of front passages 79 extending from the blade air passage 71a to the upstream side in the axial direction Da are formed. That is, in this modification, there are a plurality of ventral passages 72 and a plurality of ventral front passages 76 as the passages that open at the ventral end surface 64 of the platform 61c. In the present modification, there are a plurality of front passages 79 and a plurality of front ventral passages 77 as the passages opened at the front end face 62 of the platform 61c.
- the opening of the ventral passage 72 adjacent to the front portion in the ventral end surface 64 of the platform 61c is adjacent to the ventral passage 72 adjacent to the intermediate portion of the axial direction Da in the ventral end surface 64. Narrower than the mutual spacing of the openings.
- path 79 adjacent on the front end surface 62 of the platform 61c is the opening of the ventral side channel
- the mutual spacing between the openings of the front ventral passages 76 adjacent to each other in the front end portion in the ventral end surface 64 of the platform 61c is adjacent to the middle portion in the axial direction Da in the ventral end surface 64. It is narrower than the mutual distance between the openings of the passage 72.
- path 77 adjacent on the front end surface 62 of the platform 61c is the ventral side channel
- the cross-sectional area of the front mother passage 75 is larger than the total area of the cross-sectional areas of the plurality of front abdominal passages 76 and the front abdominal passage 77.
- the first in these passages is increased.
- path 71a becomes narrow.
- the connection positions of these passages with the first blade air passage 71a may overlap each other.
- the strength around the first blade air passage 71a side of these passages may be lower than the target strength. Furthermore, there is a possibility that the cooling air having a required flow rate does not flow in each of the front passages 79.
- the first blade air passage 71a is widened so that the area of the region where these passages can be connected is increased, and the mutual space on the cooling air supply side of the first blade air passage 71a in these passages is widened.
- a front mother passage 75 communicating with the front mother passage 75 is provided, and a plurality of front abdominal passages 76 and a plurality of front abdominal passages 77 are provided in the front mother passage 75.
- the number of passages opened on the front side of the ventral end surface 64 of the platform 61c and the number of passages opened on the ventral side of the front end surface 62 of the platform 61c are set as follows.
- the number of passages opened in the middle portion of the axial direction Da of the ventral side end face 64 of 61c is larger.
- the cross-sectional area of the front mother passage 75 is larger than the total area of the cross-sectional areas of the plurality of front abdominal passages 76 and the front abdominal passage 77, the cooling air can be supplied to the front abdominal passage 76 and the front abdominal side with less pressure loss. It can be led to the passage 77.
- the flow rate of the cooling air in the front ventral passage 76 and the front ventral passage 77 can thereby be increased, and the cooling efficiency can be increased. Therefore, in this modification, it is possible to suppress the thermal stress at the front side and the ventral side of the platform 61c.
- the front abdominal passage 76 opened at the ventral end surface 64 of the platform 61c and the front abdominal passage 77 opened at the front end surface 62 of the platform 61c are connected to the first blade air via the front mother passage 75. It communicates with the passage 71a. Therefore, in this modification, the mutual space
- the front mother passage 75 that extends from the first blade air passage 71a toward the ventral side in the circumferential direction Dc while extending toward the upstream side in the axial direction Da opens at the ventral end surface 64 of the platform 61c.
- the opening is closed by a lid 86, and the lid 86 and the edge of the opening are joined by brazing or the like.
- the lid 86 may be formed with a through hole 86 a penetrating from the front mother passage 75 to the outside of the platform 61 c.
- the through-hole 86a is formed in the lid
- the front side part of the abdominal side end surface 64 of the platform 61c is cooled more, and the thermal stress of the part of the front side and the front side of the platform 61c can be suppressed.
- the joint portion such as brazing between the opening edge of the front mother passage 75 and the lid 86 is cooled, and the joint reliability of this portion can be improved.
- a through hole is formed in the lid 86 that closes the opening of the front mother passage 75, but a through hole is similarly formed in the lid that closes the opening of the mother passage in the above-described embodiment and each of the above modifications. It may be formed.
- the moving blade 50d of this modification is obtained by making the cross-sectional area a2 of the back-side mother passage 73 in the moving blade 50 of the above-described embodiment larger than the cross-sectional area a3 of the back-side passage 74, and other configurations are the same as those of the above-described embodiment. The same as the wing 50.
- the cross-sectional area a3 of the back passage 74 of the present modification is larger than the cross-sectional area a1 of the ventral passage 72, as in the above-described embodiment and the above-described modifications.
- the cross-sectional area a2 of the back-side mother passage 73 of the present modification is larger than the cross-sectional area a3 of the back-side passage 74.
- the total area of the cross-sectional areas of the plurality of ventral passages 72 is larger than the cross-sectional area of the dorsal passage 74.
- the cross-sectional area a2 of the backside mother passage 73 is larger than the cross-sectional area a3 of the backside passage 74, so that the first blade air passage 71a is changed to the backside passage 74 via the backside mother passage 73.
- the pressure loss of the cooling air that flows in can be reduced.
- the flow rate of the cooling air passing through the back side passage 74 is increased, so that the heat transfer coefficient in the back side passage 74 can be increased. Therefore, according to the present modification, the back portion of the platform 61d can be efficiently cooled.
- the back passage 74 of the above embodiment opens at the rear end face 63 of the platform 61.
- the moving blade 50e of this modification has a plurality of openings extending from the back side passage 74 toward the back side end surface 65 and opening at the back side end surface 65 of the platform 61e, while closing the opening of the back side passage 74 with a lid 87.
- the other configuration is the same as that of the moving blade 50 of the above embodiment.
- Each of the cross-sectional areas of the plurality of back-side branch passages 78 is smaller than the cross-sectional area of the back-side passage 74, and the total area of the cross-sectional areas of the plurality of back-side branch passages 78 is greater than or equal to the cross-sectional area of the back-side passage 74. It is.
- the plurality of dorsal branch passages 78 opened at the dorsal end surface 65 are provided, so that the dorsal end surface 65 can be cooled and the belly of other platforms 61e adjacent in the circumferential direction Dc can be cooled.
- the side end face 64 can also be cooled.
- the lid 85 blocking the opening of the backside mother passage 73 and the lid 85 closing the opening of the backside passage 74 forming the mother passage of the backside branching passage 78 are shown in FIG.
- a through hole may be formed as described above.
- the back side mother passage 73 receives the cooling air from the first blade air passage 71a.
- the cooling air from other locations is received by the back side mother passage 73b.
- the other configuration is the same as the moving blade 50 of the above embodiment.
- a recess 69 is formed at the front side and on the back side of the wing body 51 so as to allow cooling air to flow in from the inner surface 67 of the platform 61f toward the outside in the radial direction.
- the back-side mother passage 73b of this modification communicates with the recess 69 and receives cooling air from the recess 69.
- the back-side mother passage 73b opens at the back-side end face 65 of the platform 61f. The opening is closed by a lid 88, and the lid 88 and the edge of the opening are joined by brazing or the like.
- the present modification is different from the above embodiment in that the receiving destination of the cooling air in the backside mother passage 73b is changed, and the other configurations are the same, and thus the same as in the above embodiment.
- the amount of cooling air used can be reduced while improving the durability of the moving blade 50f.
- the backside mother passage 73b does not receive the cooling air from the first blade air passage 71a, so the cooling air flowing through the first blade air passage 71a can be used for other purposes.
- the recess 69 and the backside mother passage 73b are communicated, but the second blade air passage 71c and the backside mother passage that are second from the upstream in the axial direction among the plurality of blade air passages 71. 73b may be communicated.
- the moving blade 50g of this modification is a modification of the moving blade 50f of the sixth modification.
- the moving blade 50g of the present modified example is similar to the moving blade 50f of the sixth modified example, the main passage 81 extending from the first blade air passage 71a toward the back in the circumferential direction, and from the main passage 81 toward the back end face 65.
- a plurality of passages 82 that extend and open at the back end face 65 are added, and other configurations are basically the same as those of the sixth modification.
- the back side mother passage 73c extending from the recess 69 toward the back side in the circumferential direction Dc is defined as a first back side mother passage 73c
- a main passage 81 extending from the first blade air passage 71a toward the back side in the circumferential direction is defined as a second back side main passage 81, and a plurality of passages extending from the second back side main passage 81 toward the back end face 65.
- 82 is a second dorsal passage 82.
- the second backside mother passage 81 opens at the back end face 65 of the platform 61g. This opening is closed by a lid 89, and the lid 89 and the edge of the opening are joined by brazing or the like. As described above with reference to FIG. 13, the lid 89 may also be formed with a through hole 89 a penetrating from the inside of the second back side mother passage 81 to the outside of the platform 61 g.
- the cross-sectional area a3 of the first back side passage 74 is larger than the cross-sectional area a1 of the abdominal side passage 72 as in the above-described embodiment and the above-described modifications. Further, the cross-sectional area a2 of the first back-side mother passage 73c may be larger than the cross-sectional area a3 of the first back-side passage 74 as in the fourth modification.
- the cross-sectional area d4 of the second back-side mother passage 81 is larger than the cross-sectional area a1 of the ventral-side passage 72 and is substantially the same as the cross-sectional area a3 of the first back-side passage 74.
- the cooling air from the first blade air passage 71a flows out from the back side end face 65 of the platform 61g from the second back side mother passage 81 and the plurality of second back side passages 82. Therefore, in this modification, the front side of the back end face 65 of the platform 61g can be cooled more than in the sixth modification.
- a passage extending from the second backside mother passage 81 toward the backside end face 65 is formed.
- the second backside mother passage 81 can be used.
- a passage extending toward the front end face 62 and opening at the front end face 62 may be formed.
- first back side mother passage 73c is communicated with the recess 69, but as described above, the first back side mother passage 73c may be communicated with the second blade air passage 71c.
- the moving blade 50h of the present modification is obtained by changing a part of the plurality of ventral passages 72 in the moving blade 50 of the above embodiment to a second ventral passage 83 that opens at the gas path surface 66 of the platform 61h.
- the configuration is the same as in the above embodiment.
- the ventral passage 72 that opens at the ventral end surface 64 of the platform 61h is referred to as a first ventral passage 72 as in the above embodiment.
- the second ventral passage 83 communicates with the wing air passage 71.
- the second ventral passage 83 is inclined with respect to the gas path surface 66 so as to gradually approach the gas path surface 66 toward the ventral side.
- the cooling air flowing out of the platform 61 h from the blade air passage 71 through the second ventral passage 83 flows along the gas path surface 66.
- the gas path surface 66 is film-cooled by the cooling air flowing out from the second ventral passage 83.
- the mutual interval between the openings adjacent to each other at the front side portion in the ventral end surface 64 of the platform 61a is narrower than the mutual interval between the adjacent openings at the intermediate portion in the axial direction Da in the ventral end surface 64 (
- the feature configuration 1a) is adopted.
- a configuration in which an opening between adjacent openings on the front end surface 62 of the platform 61a is narrower than an opening between adjacent openings at an intermediate portion in the axial direction Da in the ventral end surface 64 of the platform 61a hereinafter referred to as “the first opening”.
- the feature configuration 1b At least one of the characteristic configuration 1a and the characteristic configuration 1b may be adopted for the second and subsequent modifications and combinations thereof.
- the mutual interval between the openings adjacent to each other in the rear portion of the ventral end surface 64 of the platform 61b is narrower than the mutual interval between the openings adjacent to each other in the middle portion of the axial direction Da in the ventral end surface 64.
- This characteristic configuration 2 may be adopted for a modified example other than the second modified example and a combination thereof.
- the third modified example includes a front mother passage 75 that communicates with the first blade air passage 71a, a plurality of front abdominal passages 76 that communicate with the front mother passage 75, and a plurality of front abdominal passages that communicate with the front mother passage 75. 77 is employed (hereinafter referred to as characteristic configuration 3).
- This characteristic configuration 3 may be adopted for a modified example other than the third modified example and combinations thereof.
- characteristic configuration 3a a configuration in which a through-hole is formed in the lid that closes the opening of the passage.
- the fourth modification employs a configuration in which the cross-sectional area a2 of the back-side mother passage 73 is larger than the cross-sectional area a3 of the back-side passage 74 (hereinafter referred to as characteristic configuration 4).
- This characteristic configuration 4 may also be adopted for modifications other than the fourth modification and the seventh modification, and combinations thereof.
- the fifth modification employs a configuration in which a plurality of back-side branch passages 78 are branched from the back-side passage 74 (hereinafter referred to as feature configuration 5).
- This characteristic configuration 5 may be adopted for a modified example other than the fifth modified example and combinations thereof.
- the sixth modification employs a configuration in which the recess 69 of the platform 61f communicates with the back-side mother passage 73b (hereinafter referred to as a feature configuration 6).
- This characteristic configuration 6 may be adopted for a modified example other than the sixth modified example and the seventh modified example, and a combination thereof.
- the seventh modified example employs a configuration (characteristic configuration 7) in which the second back-side mother passage 81 and the second back-side passage 82 are provided in the modified example having the characteristic configuration 6 described above. Therefore, the feature configuration 7 may be adopted in a modification example having the feature configuration 6 by combining the feature configurations of a plurality of modification examples except the seventh modification example.
- the eighth modification employs a configuration in which the second ventral passage 83 is provided (hereinafter referred to as feature configuration 8).
- This characteristic configuration 8 may be adopted for a modified example other than the eighth modified example and a combination thereof.
- the characteristic configurations of the plurality of modified examples may be combined as appropriate.
- the feature configuration 2 of the second modification, the feature configuration 3 of the third modification, and the feature configuration 3a may be adopted in the above embodiment.
- the feature configuration 2 or the feature configuration 3a may not be adopted.
- the feature configuration 1 may be adopted.
- the feature configuration 4 of the fourth modification, the feature configuration 5 of the fifth modification, the feature configuration 6 of the sixth modification, the feature configuration 7 of the seventh modification, the feature configuration 8 of the eighth modification, etc. May be further adopted.
- the above-described embodiment includes a feature configuration 1 of the first modification, a feature configuration 2 of the second modification, a feature configuration 6 of the sixth modification, and a seventh.
- the feature configuration 2, the feature configuration 7, and the feature configuration 8 may not be adopted.
- the feature configuration 3 may be adopted instead of the feature configuration 1.
- the feature configuration 5 of the fifth modified example may be adopted as appropriate.
- the characteristic configuration 6 a configuration is used in which the second blade air passage 71c and the first backside mother passage 73d are communicated.
- the cross-sectional area of the first back-side mother passage 73d and the cross-sectional area of the first back-side passage 74 are the same.
- the cross-sectional area of the first back side passage 73d may be larger than the cross-sectional area of the first back side passage 74.
- the amount of cooling air used can be suppressed while improving the durability of the rotor blade.
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Abstract
Description
ロータ軸の外周側に取り付けられる動翼において、前記ロータ軸に対する径方向に延びる翼体と、前記翼体の径方向内側に形成され、燃焼ガスが流れる燃焼ガス流路の径方向内側を画定するプラットフォームと、を有し、前記翼体及び前記プラットフォームには、前記径方向に延びて、前記翼体中及び前記プラットフォーム中を連なり、冷却空気が流れる翼空気通路が形成され、前記プラットフォームには、前記ロータ軸が延びる軸方向であって前記燃焼ガスが流れて行く軸方向下流側の端面である後端面と、前記軸方向下流側とは反対側の軸方向上流側の端面である前端面と、前記ロータ軸に対する周方向であって前記翼体の腹側である周方向腹側の端面である腹側端面と、前記周方向腹側とは反対側である周方向背側の端面である背側端面とが形成されていると共に、前記翼空気通路から前記周方向腹側に向かって延びて前記腹側端面で開口し、前記軸方向に並ぶ複数の腹側通路と、冷却空気が流入し、端部が前記翼体よりも前記周方向背側に位置する母通路である背側母通路と、前記背側母通路と連通し、前記背側母通路から前記背側端面に沿って前記軸方向成分を有する方向に延びる背側通路と、が形成されている。
以上のいずれかの複数の動翼と、複数の前記動翼が取り付けられる前記ロータ軸と、複数の前記動翼及び前記ロータ軸を有して構成されるタービンロータを回転可能に覆うタービンケーシングと、燃料を燃焼させて前記燃焼ガスを生成する燃焼器と、を備えている。
ガスタービンの実施形態について、図1及び図2を参照して説明する。
本発明に係る動翼の第一変形例について、図9及び図10を用いて説明する。
本発明に係る動翼の第二変形例について、図11を用いて説明する。
本発明に係る動翼の第三変形例について、図12及び図13を用いて説明する。
本発明に係る動翼の第四変形例について、図14を用いて説明する。
本発明に係る動翼の第五変形例について、図15を用いて説明する。
本発明に係る動翼の第六変形例について、図16及び図17を用いて説明する。
本発明に係る動翼の第七変形例について、図18を用いて説明する。
本発明に係る動翼の第八変形例について、図19及び図20を用いて説明する。
第一変形例は、プラットフォーム61aの腹側端面64中の前側部分で隣り合う開口の相互間隔が、この腹側端面64中の軸方向Daの中間部分で隣り合う開口の相互間隔より狭い構成(以下、特徴構成1aとする)を採用するものである。また、第一変形例は、プラットフォーム61aの前端面62で隣り合う開口の相互間隔が、プラットフォーム61aの腹側端面64中の軸方向Daの中間部分で隣り合う開口の相互間隔より狭い構成(以下、特徴構成1bとする)を採用するものである。第二変形例以降の変形例、及びこれらを組み合わせたものに対しても、上記特徴構成1aと上記特徴構成1bとのうち、少なくも一方の構成を採用してもよい。
Claims (19)
- ロータ軸の外周側に取り付けられる動翼において、
前記ロータ軸に対する径方向に延びる翼体と、
前記翼体の径方向内側に形成され、燃焼ガスが流れる燃焼ガス流路の径方向内側を画定するプラットフォームと、
を有し、
前記翼体及び前記プラットフォームには、前記径方向に延びて、前記翼体中及び前記プラットフォーム中を連なり、冷却空気が流れる翼空気通路が形成され、
前記プラットフォームには、
前記ロータ軸が延びる軸方向であって前記燃焼ガスが流れて行く軸方向下流側の端面である後端面と、前記軸方向下流側とは反対側の軸方向上流側の端面である前端面と、前記ロータ軸に対する周方向であって前記翼体の腹側である周方向腹側の端面である腹側端面と、前記周方向腹側とは反対側である周方向背側の端面である背側端面とが形成されていると共に、
前記翼空気通路から前記周方向腹側に向かって延びて前記腹側端面で開口し、前記軸方向に並ぶ複数の腹側通路と、冷却空気が流入し、端部が前記翼体よりも前記周方向背側に位置する母通路である背側母通路と、前記背側母通路と連通し、前記背側母通路から前記背側端面に沿って前記軸方向成分を有する方向に延びる背側通路と、が形成されている、
動翼。 - 請求項1に記載の動翼において、
複数の前記腹側通路の各断面積は、いずれも前記背側通路の断面積よりも小さく、複数の前記腹側通路の各断面積の合計面積は、前記背側通路の断面積よりも大きい、
動翼。 - 請求項1又は2に記載の動翼において、
前記腹側端面の前記軸方向上流側から前記軸方向下流側にかけて、複数の前記腹側通路の開口が間隔をあけて形成され、
前記腹側端面の前記軸方向上流側部分で隣り合う前記腹側通路の開口の相互間隔は、前記腹側端面の前記軸方向の中間部分で隣り合う前記腹側通路の開口の相互間隔より狭い、
動翼。 - 請求項3に記載の動翼において、
前記腹側端面の前記軸方向上流側の部分で隣り合う前記腹側通路の開口は、前記径方向の位置が互いに異なっている、
動翼。 - 請求項1から4のいずれか一項に記載の動翼において、
前記腹側端面の前記軸方向上流側から前記軸方向下流側にかけて、複数の前記腹側通路の開口が間隔をあけて形成され、
前記腹側端面の前記軸方向下流側部分で隣り合う前記腹側通路の開口の相互間隔は、前記腹側端面の前記軸方向の中間部分で隣り合う前記腹側通路の開口の相互間隔より狭い、
動翼。 - 請求項1から5のいずれか一項に記載の動翼において、
前記翼体及び前記プラットフォームには、前記径方向に延びる複数の前記翼空気通路が、前記翼体の翼弦に沿って複数並んで形成され、
前記プラットフォームには、複数の前記翼空気通路のうちで最も前記軸方向上流側の第一翼空気通路から前記周方向腹側に向いつつ前記軸方向上流側に向って延びる母通路である前側母通路と、前記前側母通路から前記周方向腹側に向って延び前記腹側端面で開口する一以上の腹前側通路と、前記前側母通路から前記軸方向上流側に向って延び前記前端面で開口する一以上の前腹側通路と、が形成されている、
動翼。 - 請求項6に記載の動翼において、
前記プラットフォームには、前記軸方向に並ぶ複数の前記腹前側通路が形成され、
前記腹側端面で隣り合う前記腹前側通路の開口の相互間隔は、前記腹側端面の前記軸方向の中間部分で隣り合う前記腹側通路の開口の相互間隔より狭い、
動翼。 - 請求項6又は7に記載の動翼において、
前記プラットフォームには、前記周方向に並ぶ複数の前記前腹側通路が形成され、
前記前端面で隣り合う前記前腹側通路の開口の相互間隔は、前記腹側端面の前記軸方向の中間部分で隣り合う前記腹側通路の開口の相互間隔より狭い、
動翼。 - 請求項6から8のいずれか一項に記載の動翼において、
前記プラットフォームには、前記第一翼空気通路から前記軸方向上流側に向って延び前記前端面で開口する複数の前側通路が形成され、
前記前端面で隣り合う前記前側通路の前記開口の相互間隔は、前記腹側端面の前記軸方向の中間部分で隣り合う前記腹側通路の開口の相互間隔より狭い、
動翼。 - 請求項3、4、7のいずれか一項に記載の動翼において、
前記翼体の前縁部と前記腹側端面との間における最短距離は、前記翼体の背側の部分と前記背側端面との間の最短距離より短い、
動翼。 - 請求項8又は9に記載の動翼において、
前記翼体の前縁部と前記前端面との間における最短距離は、前記翼体の背側の部分と前記背側端面との間の最短距離より短い、
動翼。 - 請求項1から11のいずれか一項に記載の動翼において、
前記背側母通路の断面積は、前記背側通路の断面積より大きい、
動翼。 - 請求項1から12のいずれか一項に記載の動翼において、
前記翼体及び前記プラットフォームには、前記径方向に延びる複数の前記翼空気通路が、前記翼体の翼弦に沿って複数並んで形成され、
前記背側母通路は、複数の前記翼空気通路のうちで最も前記軸方向上流側の第一翼空気通路から前記周方向背側に向かって延びている、
動翼。 - 請求項1から12のいずれか一項に記載の動翼において、
前記プラットフォームの前記径方向内側には、前記軸方向上流側であって前記翼体よりも前記周方向背側の位置に、径方向外側に向って凹んで冷却空気が流入する凹部が形成され、
前記背側母通路は、前記凹部から前記周方向背側に向かって延びている、
動翼。 - 請求項1から12のいずれか一項に記載の動翼において、
前記翼体及び前記プラットフォームには、前記径方向に延びる複数の前記翼空気通路が、前記翼体の翼弦に沿って複数並んで形成され、
前記背側母通路は、複数の前記翼空気通路のうちで前記軸方向上流側からに二番目の第二翼空気通路から前記周方向背側に向かって延びている、
動翼。 - 請求項14又は15に記載の動翼において、
前記翼体及び前記プラットフォームには、前記径方向に延びる複数の前記翼空気通路が、前記翼体の翼弦に沿って複数並んで形成され、
前記プラットフォームには、前記背側母通路である第一背側母通路及び前記背側通路である第一背側通路の他に、複数の前記翼空気通路のうちで最も前記軸方向上流側の第一翼空気通路から前記周方向背側に向かって延びる母通路である第二背側母通路と、前記第二背側母通路から前記背側端面に向って伸びて前記背側端面で開口する複数の第二背側通路と、が形成されている、
動翼。 - 請求項1から16のいずれか一項に記載の動翼において、
前記母通路は、前記プラットフォームの端面で開口し、前記開口は、蓋で塞がれ、前記蓋と前記開口の縁とが接合され、
前記蓋には、前記母通路内から前記プラットフォーム外へ貫通する貫通孔が形成されている、
動翼。 - 請求項1から17のいずれか一項に記載の動翼において、
前記プラットフォームには、前記腹側通路である第一腹側通路の他に、前記翼空気通路から前記周方向腹側に向かって延びて前記プラットフォームで前記燃焼ガスと接するガスパス面で開口する第二腹側通路が形成されている、
動翼。 - 請求項1から18のいずれか一項に記載の複数の動翼と、
複数の前記動翼が取り付けられる前記ロータ軸と、
複数の前記動翼及び前記ロータ軸を有して構成されるタービンロータを回転可能に覆うタービンケーシングと、
燃料を燃焼させて前記燃焼ガスを生成する燃焼器と、
を備えているガスタービン。
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EP15794807.6A EP2990608B1 (en) | 2014-06-27 | 2015-06-05 | Rotor blade and gas turbine equipped with same |
KR1020157031752A KR101614678B1 (ko) | 2014-06-27 | 2015-06-05 | 동익 및 이것을 구비하고 있는 가스 터빈 |
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CN105275503A (zh) | 2016-01-27 |
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