WO2009139374A1 - ガスタービン翼およびこれを備えたガスタービン - Google Patents
ガスタービン翼およびこれを備えたガスタービン Download PDFInfo
- Publication number
- WO2009139374A1 WO2009139374A1 PCT/JP2009/058824 JP2009058824W WO2009139374A1 WO 2009139374 A1 WO2009139374 A1 WO 2009139374A1 JP 2009058824 W JP2009058824 W JP 2009058824W WO 2009139374 A1 WO2009139374 A1 WO 2009139374A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wall portion
- cooling
- flow path
- gas turbine
- wing
- 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
- F01D5/12—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
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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
- 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
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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
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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
- 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
- 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
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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
- F05D2240/10—Stators
- F05D2240/12—Fluid guiding means, e.g. vanes
- F05D2240/121—Fluid guiding means, e.g. vanes related to the leading edge of a stator vane
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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
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
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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
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/12—Two-dimensional rectangular
- F05D2250/121—Two-dimensional rectangular square
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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
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/13—Two-dimensional trapezoidal
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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
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/18—Two-dimensional patterned
- F05D2250/185—Two-dimensional patterned serpentine-like
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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
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/221—Improvement of heat transfer
Definitions
- the present invention relates to a gas turbine blade having a cooling structure.
- the cooling fluid flowing in the serpentine flow path has a problem that the temperature rises due to the heat received by cooling the gas turbine blade, and the desired cooling performance cannot be exhibited on the downstream side.
- measures have been taken to increase the heat transfer performance by providing a turbulator in the flow path, but this is not sufficient in view of the future temperature rise of the combustion gas.
- the present invention has been made in view of such circumstances, and provides a gas turbine blade capable of improving the heat transfer performance of a serpentine flow path and a gas turbine including the same.
- the gas turbine blade of the present invention and the gas turbine provided with the same employ the following means. That is, in the gas turbine blade according to the present invention, a plurality of cooling passages extending from the base end side to the tip end side of the blade are provided from the leading edge to the trailing edge of the blade, and at least two of these cooling passages are In the gas turbine blade having a serpentine flow path that is folded back and connected at the base end portion or the distal end portion, the serpentine flow path is a cooling flow path on the most downstream side from a cooling flow path on the most upstream side of the serpentine flow path.
- the channel cross-sectional area is formed so as to become smaller in order.
- the flow passage cross-sectional area of the cooling flow path constituting the serpentine flow path is gradually reduced from the most upstream side to the most downstream side, the flow velocity increases as the cooling fluid flows downstream. Therefore, even if the temperature of the cooling fluid rises as it flows downstream, a decrease in heat transfer performance can be compensated for by an increase in flow velocity.
- the first cooling section that divides the first cooling flow path located on the front edge side and the second cooling flow path adjacent to the rear edge side of the first cooling flow path, and the second cooling A second wall section defining a flow path and a third cooling flow path adjacent to the rear edge side of the second cooling flow path, and a second wall portion adjacent to the rear edge side of the third cooling flow path and the third cooling flow path.
- the serpentine channel is formed by the second to fourth cooling channels, so that the second cooling channel is located on the most downstream side.
- the first wall portion and the third wall portion are arranged such that the distance between them is separated from the ventral side of the wing toward the back side, and the second wall portion is substantially parallel to the third wall portion.
- the second flow path having a substantially triangular cross section is formed by the first wall portion, the second wall portion, and the back side wall portion of the wing, Wall, back side wall portion of the blade may be configured to the third wall portion and the third flow path having a substantially rectangular cross section by the ventral side wall portion of the blade is formed.
- the first wall portion and the third wall portion are arranged so that the distance between them is separated from the ventral side of the wing toward the back side.
- the cross-sectional shape formed by the head portion, the abdominal side wall portion of the wing and the back side wall portion of the wing is such that the abdominal side wall portion of the wing is a short side, the back side wall portion of the wing is a long side, the first wall portion and the third wall portion are It becomes a substantially trapezoid with a hypotenuse. This trapezoid was divided into a triangular shape and a quadrangular shape by a second wall portion extending in parallel with the third wall portion.
- the rectangular shape which does not become flat as much as possible can be obtained by using the belly side wall part of the wing
- the second wall portion may be connected to the first wall portion without being connected to the abdominal side wall portion of the blade.
- the abdominal wall portion of the wing is covered with the thickness of the second wall portion. There is no. Therefore, it is possible to secure a heat transfer area in which the abdominal side wall portion of the blade is in direct contact with the cooling fluid without being disturbed by the second wall portion, and the cooling capacity is increased.
- the first cooling section that divides the first cooling flow path located on the front edge side and the second cooling flow path adjacent to the rear edge side of the first cooling flow path, and the second cooling A second wall section defining a flow path and a third cooling flow path adjacent to the rear edge side of the second cooling flow path, and a second wall portion adjacent to the rear edge side of the third cooling flow path and the third cooling flow path.
- the serpentine channel is formed by the second to fourth cooling channels, so that the second cooling channel is located on the most downstream side.
- the first wall portion and the third wall portion are arranged such that the distance therebetween is spaced from the ventral side of the wing toward the back side, and the second wall portion is substantially parallel to the second wall portion.
- the second channel having a substantially rectangular cross section is formed by the first wall portion, the back side wall portion of the wing, the second wall portion, and the abdominal side wall portion of the wing.
- the second wall portion, the ventral side wall portion of the blade may be configured to the third flow path having a substantially triangular cross-section by the third wall portion is formed.
- the first wall portion and the third wall portion are arranged so that the distance between them is separated from the ventral side of the wing toward the back side.
- the cross-sectional shape formed by the head portion, the abdominal side wall portion of the wing and the back side wall portion of the wing is such that the abdominal side wall portion of the wing is a short side, the back side wall portion of the wing is a long side, the first wall portion and the third wall portion are It becomes a substantially trapezoid with a hypotenuse.
- the trapezoid is divided into a quadrangular shape and a triangular shape by a second wall portion extending in parallel with the first wall portion.
- the rectangular shape which does not become flat as much as possible can be obtained by using the belly side wall part of the wing
- the heat-transfer area of an abdominal side wall part can be enlarged, and the cooling capacity of a wing
- the second wall portion may be connected to the third wall portion without being connected to the abdominal side wall portion of the blade.
- the abdominal side wall portion of the wing is covered with the thickness of the second wall portion. There is no. Therefore, it is possible to secure a heat transfer area in which the abdominal side wall portion of the blade is in direct contact with the cooling fluid without being disturbed by the second wall portion, and the cooling capacity is increased.
- the gas turbine of this invention is good also as a structure provided with one of said gas turbine blades. According to this configuration, since the gas turbine blade described in any of the above is provided, a gas turbine having excellent cooling performance can be provided.
- the cross-sectional area of the cooling flow path constituting the serpentine flow path is gradually reduced from the most upstream side to the most downstream side, even if the temperature of the cooling fluid rises as it flows downstream, it is transmitted by the increase in flow rate. It can compensate for the decrease in heat. Thereby, high cooling efficiency can be obtained with a small amount of cooling air which is the minimum necessary.
- FIG. 1 is a cross-sectional view of a gas turbine blade according to a first embodiment of the present invention. It is a cross-sectional view of the gas turbine blade concerning 2nd Embodiment of this invention. It is a cross-sectional view of the gas turbine blade concerning 3rd Embodiment of this invention. It is a longitudinal section of a gas turbine blade concerning one embodiment of the present invention.
- FIG. 4 shows a longitudinal section of the gas turbine blade according to the present embodiment.
- the gas turbine blade 1 shown in the figure is suitable for use in a moving blade.
- the gas turbine blade 1 includes a base portion 6 that forms a platform, and a blade portion 4 that stands up (in the radial direction) above the base portion 6 and that forms a blade profile.
- the base 6 is provided with a first air introduction path 10A, a second air introduction path 10B, and a third air introduction path 10C through which cooling air that is a cooling fluid is introduced.
- a cooling air a part of the air compressed by the compressor that compresses the combustion air is used.
- a plurality of cooling passages extending in the span direction of the blade are formed in the blade portion 4, and the first cooling passage 12A, the second cooling passage 12B, A third cooling channel 12C, a fourth cooling channel 12D, a fifth cooling channel 12E, a sixth cooling channel 12F, a seventh cooling channel 12G, and an eighth cooling channel 12H are formed.
- the first cooling flow path 12A is connected to the first air introduction path 10A.
- the cooling air introduced from the first air introduction passage 10A flows in the first cooling passage 12A from the lower side to the upper side (outward in the radial direction), and flows out from a film cooling hole (not shown) to the outside. Cool the outer surface of the.
- the second to fourth cooling flow paths 12B, 12C, and 12D form a series of serpentine flow paths. That is, the fourth cooling flow path 12D is connected so that it is the most upstream, the third cooling flow path 12C is downstream, and the second cooling flow path 12B is most downstream.
- the fourth cooling flow path 12D and the third cooling flow path 12C are folded back and connected at the tip of the blade. Further, the third cooling flow path 12C and the second cooling flow path 12B are folded and connected at the base end portion of the blade.
- the second air introduction path 10B is connected to the fourth cooling flow path 12D, and the cooling air introduced from the second air introduction path 10B is the fourth cooling flow path 12D, the third cooling flow path 12C, It flows in the order of 2 cooling flow paths 12B.
- the cooling air that has flowed to the second cooling flow path 12B flows out from the film cooling hole (not shown) to cool the outer surface of the blade.
- the fifth to seventh cooling channels 12E, 12F, 12G form a series of serpentine channels. That is, the fifth cooling channel 12E is connected to the most upstream, the sixth cooling channel 12F is connected to the downstream, and the seventh cooling channel 12G is connected to the most downstream.
- the fifth cooling flow path 12E and the sixth cooling flow path 12F are folded and connected at the tip of the blade. Further, the sixth cooling flow path 12F and the seventh cooling flow path 12G are folded and connected at the base end portion of the blade.
- the third air introduction path 10C is connected to the fifth cooling flow path 12E, and the cooling air introduced from the third air introduction path 10C is the fifth cooling flow path 12E, the sixth cooling flow path 12F, It flows in the order of 7 cooling flow paths 12G.
- the cooling air that has flowed into the seventh cooling flow path 12G flows out from the film cooling hole (not shown) to cool the outer surface of the blade.
- Cooling air is introduced into the eighth cooling passage 12H from an air introduction passage (not shown), and the introduced cooling air flows upward (radially outward) in the eighth cooling passage 12H and the trailing edge of the blade. Out to the outside.
- FIG. 1 shows a cross section of the gas turbine blade 1.
- a symbol with a solid point in the circle means that the cooling air flows radially outward (from below to above in FIG. 4) in the channel.
- a symbol with a cross in the circle means that the cooling air flows inward in the radial direction (from top to bottom in FIG. 4).
- the first cooling channel 12A and the second cooling channel 12B are partitioned by the first wall portion 22A.
- the second cooling channel 12B and the third cooling channel 12C are the second wall portion 22B
- the third cooling channel 12C and the fourth cooling channel 12D are the third wall portion 22C and the fourth cooling channel 12D.
- the fifth cooling channel 12E is the fourth wall 22D
- the fifth cooling channel 12E and the sixth cooling channel 12F are the fifth wall 22E
- the sixth cooling channel 12F and the seventh cooling channel 12G are the sixth wall.
- the part 22F, the seventh cooling channel 12G, and the eighth cooling channel 12H are each partitioned by the seventh wall 22G.
- the serpentine flow path formed by the second to fourth cooling flow paths 12B, 12C, and 12D has a flow path cross-sectional area that is sequentially reduced according to the flow direction of the cooling air. That is, the cross-sectional area of the third cooling flow path 12C downstream of the fourth cooling flow path 12D that is the most upstream is smaller than that of the third cooling flow path 12C.
- the cooling channel 12B has a smaller channel cross-sectional area.
- the serpentine flow paths formed by the fifth to seventh cooling flow paths 12E, 12F, and 12G also have flow path cross-sectional areas that are sequentially reduced in accordance with the flow direction of the cooling air. That is, the cross-sectional area of the sixth cooling flow path 12F downstream of the fifth cooling flow path 12E that is the most upstream is smaller than that of the sixth cooling flow path 12F.
- the cooling channel 12G has a smaller channel cross-sectional area.
- the flow passage cross-sectional area of the cooling flow passage constituting the serpentine flow passage sequentially smaller from the most upstream side to the most downstream side, the following effects can be obtained.
- the cooling air As the cooling air flows through the serpentine flow path, the cooling air receives the heat and rises in temperature by cooling the blades, so that the cooling capacity decreases.
- the cross-sectional area of the serpentine flow path is sequentially reduced, the flow velocity can be increased as the cooling air flows downstream. Therefore, even if the temperature of the cooling fluid rises as it flows downstream, a decrease in heat transfer performance can be compensated for by increasing the flow velocity, and a desired cooling capacity can be exhibited.
- the first wall portion 22A and the third wall portion 22C are arranged such that the distance between them is separated from the abdominal side wall portion 4A of the wing toward the back side wall portion 4B.
- the second wall portion 22B extends substantially parallel to the third wall portion 22C.
- the 2nd flow path 12B which has a substantially triangular cross section is formed of 22 A of 2nd wall parts, 22 A of 2nd wall parts, and the back wall part 4B of a wing
- a third flow path 12C having a substantially rectangular cross section is formed by the second wall portion 22B, the back side wall portion 4B of the wing, the third wall portion 22C, and the abdominal side wall portion 4A of the wing.
- the first wall portion 22A and the third wall portion 22C are arranged such that the distance between them is separated from the abdominal side wall portion 4A of the wing toward the back side wall portion 4B, the first wall portion 22A and the third wall portion 22C are arranged.
- the cross-sectional shape formed by the wall portion 22C, the wing ventral side wall portion 4A, and the wing back side wall portion 4B is such that the wing ventral side wall portion 4A has a short side, the wing back side wall portion 4B has a long side, and the first wall portion. 22A and the 3rd wall part 22C become a substantially trapezoid made into the hypotenuse.
- the trapezoid is divided into a triangular shape and a quadrangular shape by the second wall portion 22B extending in parallel with the third wall portion 22C.
- the rectangular shape which is not flattened as much as possible can be obtained by using the ventral side wall portion 4A of the wing which becomes the short side of the trapezoid as one side of the quadrangle. Therefore, the heat transfer area of the abdominal wall portion 4A can be increased, and the cooling capacity of the blade is increased.
- the second wall portion 22B is connected to the first wall portion 22A without being connected to the abdominal side wall portion 4A of the wing.
- the effect by this is as follows. If the second wall portion 22B is connected to the abdominal side wall portion 4A of the wing, and the abdominal side wall portion 4A of the wing is covered by the thickness of the second wall portion 22B, this covered portion interferes with cooling. Air cannot directly contact the flank side wall portion 4A of the wing, and cooling may be insufficient. Therefore, in the present embodiment, the second wall portion 22B is connected to the first wall portion 22A without being connected to the abdominal wall portion 4A of the wing, so that the abdominal wall portion 4A of the wing is thicker than the second wall portion 22B. It was made not to be covered by. As a result, the heat transfer area in which the ventral side wall portion 4A of the blade is in direct contact with the cooling fluid without being obstructed by the second wall portion 22B can be secured, and the cooling capacity is increased.
- the fourth to sixth wall portions 22D, 22E, and 22F are also substantially parallel to the third wall portion 22C. This is because there is an advantage that when the core for forming the cooling flow path used when casting the gas turbine blade 1 is manufactured, the die can be punched in the same direction.
- the second wall portion 22B extends substantially parallel to the first wall portion 22A.
- the 2nd flow path 12B which has a substantially square cross section is formed by 22 A of 1st wall parts, the back side wall part 4B of a wing
- a third flow path 12C having a substantially triangular cross section is formed by the second wall portion 22B, the back wall portion 4B of the wing, and the third wall portion 22C.
- the first wall portion 22A and the third wall portion 22C are arranged such that the distance between them is separated from the abdominal side wall portion 4A of the wing toward the back side wall portion 4B, the first wall portion 22A and the third wall portion 22C are arranged.
- the cross-sectional shape formed by the wall portion 22C, the wing ventral side wall portion 4A, and the wing back side wall portion 4B is such that the wing ventral side wall portion 4A has a short side, the wing back side wall portion 4B has a long side, and the first wall portion. 22A and the 3rd wall part 22C become a substantially trapezoid made into the hypotenuse.
- the trapezoid is divided into a quadrangular shape and a triangular shape by the second wall portion 22B extending in parallel with the first wall portion 22A.
- the rectangular shape which is not flattened as much as possible can be obtained by using the ventral side wall portion 4A of the wing which becomes the short side of the trapezoid as one side of the quadrangle. Therefore, the heat transfer area of the abdominal wall portion 4A can be increased, and the cooling capacity of the blade is increased.
- the second wall portion 22B is connected to the third wall portion 22C without being connected to the abdominal side wall portion 4A of the wing.
- the effect by this is as follows. If the second wall portion 22B is connected to the abdominal side wall portion 4A of the wing, and the abdominal side wall portion 4A of the wing is covered by the thickness of the second wall portion 22B, this covered portion interferes with cooling. Air cannot directly contact the flank side wall portion 4A of the wing, and cooling may be insufficient. Therefore, in the present embodiment, the second wall portion 22B is connected to the third wall portion 22C without being connected to the wing belly side wall portion 4A, so that the wing belly side wall portion 4A is thicker than the second wall portion 22B. It was made not to be covered by. As a result, the heat transfer area in which the ventral side wall portion 4A of the blade is in direct contact with the cooling fluid without being obstructed by the second wall portion 22B can be secured, and the cooling capacity is increased.
- FIG. 1 a third embodiment of the present invention will be described with reference to FIG.
- This embodiment is different from the first embodiment and the second embodiment in the shape of the second wall portion, and the other configurations are the same. Accordingly, only the differences will be described below, and the same operation and effect will be obtained for the other points.
- the second cooling channel and the third cooling channel are not divided into a triangular shape and a rectangular shape by the second wall portion. Therefore, the effect derived from these configurations is not achieved.
- the second wall portion 25 has a bent shape. That is, the ventral portion 25a of the second wall portion 25 is formed in parallel with the third wall portion 22C, and the back portion 25b of the second wall portion 25 is formed in parallel with the first wall portion 22A. In this way, by forming the second wall portion 25 to be bent, the channel cross-sectional area ratio of the second cooling channel 12B and the third cooling channel 12C constituting the serpentine channel can be adjusted. Further, in the present embodiment, similarly to the first embodiment and the second embodiment, the serpentine flow path constituted by the second to fourth cooling flow paths 12B, 12C, and 12D, and the fifth to seventh cooling flows.
- the cross-sectional area of the serpentine flow path constituted by the paths 12E, 12F, and 12G is formed to become smaller in order from the most upstream side to the most downstream side, the flow velocity is increased as the cooling air flows downstream. Even if the temperature of the cooling fluid rises as it flows downstream, a decrease in heat transfer can be compensated for by increasing the flow velocity, and a desired cooling capacity can be exhibited.
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Abstract
Description
すなわち、本発明にかかるガスタービン翼は、翼の基端部側から先端部側にわたって延在する冷却流路が翼の前縁から後縁にかけて複数設けられ、これら冷却流路の少なくとも2つが前記基端部または前記先端部にて折り返して接続されたサーペンタイン流路を有するガスタービン翼において、前記サーペンタイン流路は、該サーペンタイン流路の最上流側の冷却流路から最下流側の冷却流路にかけて、流路断面積が順次小さく形成されていることを特徴とする。
この構成によれば、上記のいずれかに記載されたガスタービン翼を備えているので、冷却性能に優れたガスタービンを提供することができる。
[第1実施形態]
図4には、本実施形態にかかるガスタービン翼の縦断面が示されている。
同図に示されたガスタービン翼1は、動翼に用いられて好適なものである。ガスタービン翼1は、プラットフォームを形成する基部6と、基部6の上方(半径方向)に立設するとともに翼のプロファイルを形成する翼部4とを備えている。
同図に示されているように、第1冷却流路12Aと第2冷却流路12Bとは、第1壁部22Aによって仕切られている。同様に、第2冷却流路12Bと第3冷却流路12Cは第2壁部22B、第3冷却流路12Cと第4冷却流路12Dは第3壁部22C、第4冷却流路12Dと第5冷却流路12Eは第4壁部22D、第5冷却流路12Eと第6冷却流路12Fは第5壁部22E、第6冷却流路12Fと第7冷却流路12Gは第6壁部22F、第7冷却流路12Gと第8冷却流路12Hは第7壁部22Gによって、それぞれ仕切られている。
冷却空気は、サーペンタイン流路を流れるに従い、翼を冷却することによって熱を受け取り温度上昇するので、冷却能力が低下する。本実施形態では、サーペンタイン流路の流路断面積を順次小さくすることとしたので、冷却空気が下流に流れるにしたがい流速を上昇させることができる。したがって、下流に流れるにしたがい冷却流体の温度が上昇しても流速の増大によって伝熱性能の低下を補うことができ、所望の冷却能力を発揮することができる。
第1壁部22Aと第3壁部22Cとは、これらの間隔が翼の腹側壁部4Aから背側壁部4Bに向かって離間するように配置されているので、第1壁部22A、第3壁部22C、翼の腹側壁部4Aおよび翼の背側壁部4Bによって形成される横断面形状は、翼の腹側壁部4Aが短辺、翼の背側壁部4Bが長辺、第1壁部22Aおよび第3壁部22Cが斜辺とされた略台形となる。この台形を、第3壁部22Cと平行に延在させた第2壁部22Bによって三角形状と四角形状に分けることとした。これにより、台形の短辺となる翼の腹側壁部4Aを四角形の一辺として用いることとして、可及的に扁平とならない四角形状を得ることができる。したがって、腹側壁部4Aの伝熱面積を大きくすることができ、翼の冷却能力が増大する。
仮に、第2壁部22Bを翼の腹側壁部4Aに接続し、翼の腹側壁部4Aを第2壁部22Bの肉厚によって覆ってしまうと、この覆われた部分が邪魔をして冷却空気が翼の腹側壁部4Aに直接的に接触することができず、冷却が不十分となるおそれがある。そこで、本実施形態では、第2壁部22Bを翼の腹側壁部4Aに接続せずに第1壁部22Aに接続することで、翼の腹側壁部4Aが第2壁部22Bの肉厚によって覆われることがないようにした。これにより、翼の腹側壁部4Aが第2壁部22Bによって邪魔されずに冷却流体に直接的に接する伝熱面積を確保することができ、冷却能力が増大する。
次に、本発明の第2実施形態について、図2を用いて説明する。本実施形態は、第1実施形態に対して、第2壁部24Bの延在方向が異なり、その他の構成については同様である。したがって、以下では相違点のみついて説明し、その他については同様の作用効果を奏するものとする。
第1壁部22Aと第3壁部22Cとは、これらの間隔が翼の腹側壁部4Aから背側壁部4Bに向かって離間するように配置されているので、第1壁部22A、第3壁部22C、翼の腹側壁部4Aおよび翼の背側壁部4Bによって形成される横断面形状は、翼の腹側壁部4Aが短辺、翼の背側壁部4Bが長辺、第1壁部22Aおよび第3壁部22Cが斜辺とされた略台形となる。この台形を、第1壁部22Aと平行に延在させた第2壁部22Bによって四角形状と三角形状に分けることとした。これにより、台形の短辺となる翼の腹側壁部4Aを四角形の一辺として用いることとして、可及的に扁平とならない四角形状を得ることができる。したがって、腹側壁部4Aの伝熱面積を大きくすることができ、翼の冷却能力が増大する。
仮に、第2壁部22Bを翼の腹側壁部4Aに接続し、翼の腹側壁部4Aを第2壁部22Bの肉厚によって覆ってしまうと、この覆われた部分が邪魔をして冷却空気が翼の腹側壁部4Aに直接的に接触することができず、冷却が不十分となるおそれがある。そこで、本実施形態では、第2壁部22Bを翼の腹側壁部4Aに接続せずに第3壁部22Cに接続することで、翼の腹側壁部4Aが第2壁部22Bの肉厚によって覆われることがないようにした。これにより、翼の腹側壁部4Aが第2壁部22Bによって邪魔されずに冷却流体に直接的に接する伝熱面積を確保することができ、冷却能力が増大する。
次に、本発明の第3実施形態について、図3を用いて説明する。本実施形態は、第1実施形態および第2実施形態に対して、第2壁部の形状が異なり、その他の構成については同様である。したがって、以下では相違点のみついて説明し、その他については同様の作用効果を奏するものとする。なお、本実施形態は、第1実施形態および第2実施形態と異なり、第2壁部によって第2冷却流路および第3冷却流路を三角形状および四角形状に分けるものではない。したがって、これらの構成から導かれる作用効果は奏しない。
また、本実施形態は、第1実施形態および第2実施形態と同様に、第2乃至第4冷却流路12B,12C,12Dによって構成されるサーペンタイン流路、及び、第5乃至第7冷却流路12E,12F,12Gによって構成されるサーペンタイン流路の流路断面積が最上流側から最下流側にかけて順次小さく形成するようになっているので、冷却空気が下流に流れるにしたがい流速を上昇させることができ、下流に流れるにしたがい冷却流体の温度が上昇しても流速の増大によって伝熱の低下を補うことができ、所望の冷却能力を発揮することができる。
4 翼部
6 基部
12A 第1冷却流路
12B 第2冷却流路
12C 第3冷却流路
12D 第4冷却流路
22A 第1壁部
22B 第2壁部
22C 第3壁部
Claims (6)
- 翼の基端部側から先端部側にわたって延在する冷却流路が翼の前縁から後縁にかけて複数設けられ、これら冷却流路の少なくとも2つが前記基端部または前記先端部にて折り返して接続されたサーペンタイン流路を有するガスタービン翼において、
前記サーペンタイン流路は、該サーペンタイン流路の最上流側の冷却流路から最下流側の冷却流路にかけて、流路断面積が順次小さく形成されていることを特徴とするガスタービン翼。 - 前縁側に位置する第1冷却流路と該第1冷却流路の後縁側に隣接する第2冷却流路とを区画する第1壁部と、
前記第2冷却流路と該第2冷却流路の後縁側に隣接する第3冷却流路とを区画する第2壁部と、
前記第3冷却流路と該第3冷却流路の後縁側に隣接する第4冷却流路とを区画する第3壁部と、
を備え、
前記第2冷却流路が最下流側とされるように、前記第2乃至第4冷却流路によって前記サーペンタイン流路が形成され、
前記第1壁部と前記第3壁部とは、これらの間隔が翼の腹側から背側に向かって離間するように配置され、
前記第2壁部は、前記第3壁部と略平行に延在し、
前記第1壁部、前記第2壁部および翼の背側壁部によって、略三角形状の横断面を有する前記第2流路が形成され、
前記第2壁部、翼の背側壁部、前記第3壁部および翼の腹側壁部によって略四角形状の横断面を有する前記第3流路が形成されていることを特徴とする請求項1に記載のガスタービン翼。 - 前記第2壁部は、翼の腹側壁部に接続されずに、前記第1壁部に接続されていることを特徴とする請求項2に記載のガスタービン翼。
- 前縁側に位置する第1冷却流路と該第1冷却流路の後縁側に隣接する第2冷却流路とを区画する第1壁部と、
前記第2冷却流路と該第2冷却流路の後縁側に隣接する第3冷却流路とを区画する第2壁部と、
前記第3冷却流路と該第3冷却流路の後縁側に隣接する第4冷却流路とを区画する第3壁部と、
を備え、
前記第2冷却流路が最下流側とされるように、前記第2乃至第4冷却流路によって前記サーペンタイン流路が形成され、
前記第1壁部と前記第3壁部とは、これらの間隔が翼の腹側から背側に向かって離間するように配置され、
前記第2壁部は、前記第2壁部と略平行に延在し、
前記第1壁部、翼の背側壁部、前記第2壁部および翼の腹側壁部によって、略四角形状の横断面を有する前記第2流路が形成され、
前記第2壁部、翼の腹側壁部、前記第3壁部によって略三角形状の横断面を有する前記第3流路が形成されていることを特徴とする請求項1に記載のガスタービン翼。 - 前記第2壁部は、翼の腹側壁部に接続されずに、前記第3壁部に接続されていることを特徴とする請求項4に記載のガスタービン翼。
- 請求項1から5のいずれかに記載されたガスタービン翼を備えていることを特徴とするガスタービン。
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US12/599,833 US8465255B2 (en) | 2008-05-14 | 2009-05-12 | Gas turbine blade and gas turbine having the same |
CN200980000410.3A CN102016235B (zh) | 2008-05-14 | 2009-05-12 | 燃气轮机叶片和具备该燃气轮机叶片的燃气轮机 |
KR1020097025541A KR101163290B1 (ko) | 2008-05-14 | 2009-05-12 | 가스 터빈 블레이드 및 이것을 구비한 가스 터빈 |
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US8974182B2 (en) * | 2012-03-01 | 2015-03-10 | General Electric Company | Turbine bucket with a core cavity having a contoured turn |
WO2015020720A2 (en) * | 2013-06-17 | 2015-02-12 | United Technologies Corporation | Gas turbine engine component with rib support |
JP6245740B2 (ja) * | 2013-11-20 | 2017-12-13 | 三菱日立パワーシステムズ株式会社 | ガスタービン翼 |
KR101790146B1 (ko) * | 2015-07-14 | 2017-10-25 | 두산중공업 주식회사 | 외부 케이싱으로 우회하는 냉각공기 공급유로가 마련된 냉각시스템을 포함하는 가스터빈. |
CN108026775B (zh) * | 2015-08-28 | 2020-03-13 | 西门子公司 | 具有流动移位特征件的内部冷却的涡轮翼型件 |
EP3176371A1 (en) * | 2015-12-03 | 2017-06-07 | Siemens Aktiengesellschaft | Component for a fluid flow engine and method |
EP3433040B1 (en) * | 2016-04-27 | 2023-01-25 | Siemens Energy, Inc. | Gas turbine blade with corrugated tip wall and manufacturing method thereof |
JP6996947B2 (ja) * | 2017-11-09 | 2022-01-17 | 三菱パワー株式会社 | タービン翼及びガスタービン |
DE102021204782A1 (de) * | 2021-05-11 | 2022-11-17 | Siemens Energy Global GmbH & Co. KG | Verbesserte Schaufelspitze im Neuteil oder repariertem Bauteil und Verfahren |
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EP2186999A1 (en) | 2010-05-19 |
CN102016235A (zh) | 2011-04-13 |
CN103382857A (zh) | 2013-11-06 |
US8465255B2 (en) | 2013-06-18 |
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