US20150354369A1 - Gas turbine engine airfoil platform cooling - Google Patents
Gas turbine engine airfoil platform cooling Download PDFInfo
- Publication number
- US20150354369A1 US20150354369A1 US14/728,568 US201514728568A US2015354369A1 US 20150354369 A1 US20150354369 A1 US 20150354369A1 US 201514728568 A US201514728568 A US 201514728568A US 2015354369 A1 US2015354369 A1 US 2015354369A1
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- Prior art keywords
- airfoil
- circumferential
- edge
- cooling
- platform
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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
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
- F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
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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
- F01D5/186—Film 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
- 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
- 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
- F05D2250/20—Three-dimensional
- F05D2250/29—Three-dimensional machined; miscellaneous
- F05D2250/292—Three-dimensional machined; miscellaneous tapered
-
- 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
- F05D2250/30—Arrangement of components
- F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
- F05D2250/312—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being parallel to each other
-
- 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
- F05D2250/30—Arrangement of components
- F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
- F05D2250/314—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being inclined in relation to each other
-
- 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
- F05D2250/30—Arrangement of components
- F05D2250/32—Arrangement of components according to their shape
- F05D2250/322—Arrangement of components according to their shape tangential
-
- 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
- F05D2260/202—Heat transfer, e.g. cooling by film cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- This disclosure relates to a gas turbine engine airfoil, and more particularly, a platform cooling arrangement.
- Industrial gas turbine engines include a compressor section, a combustor section and a turbine section. Air entering the compressor section is compressed and delivered into the combustor section where it is mixed with fuel and ignited to generate a high-speed exhaust gas flow. The high-speed exhaust gas flow expands through the turbine section to drive the compressor and a power turbine.
- the compressor and turbine sections each included multiple circumferential arrays of blades and vanes.
- the turbine section in particular is subject to high temperatures that may exceed the melting temperature of the components.
- these components are cooled by one or more cooling mechanisms.
- Airfoils extend from a platform, and in the case of a blade, an inner platform supported by a root section.
- the airfoil and platform typically included cooling holes to supply cooling fluid to the hotter areas of the blade.
- a typical solution to this includes decreasing the platform metal temperatures with cooling air.
- One approach includes providing platform cooling holes supplied with “wheel-space air,” which corresponds to fluid provided between adjacent turbine blade shanks. This approach may supply insufficient pressure needed for adequate film cooling to the local and adjacent platform.
- Another approach includes providing cooling to the platform mate faces, or facing edges, supplied by cooling air from the airfoil core and/or “wheel-space air.” This approach may not provide film cooling and subjects the area to cracking due to reduced wall thickness.
- an airfoil for a gas turbine engine includes an airfoil that extends from a platform that has first and second circumferential sides that respectively extend to first and second circumferential edges.
- the first circumferential side has a tapered surface at a first angle relative to a flow path surface.
- the second circumferential surface has a cooling hole that extends toward the second lateral edge at a second angle relative to the flow path surface. The tapered surface and the cooling hole are axially aligned with one another.
- the airfoil includes a cooling passage.
- the cooling hole is in fluid communication with the cooling hole.
- the second angle is 5-40°.
- the second angle is 15-30°.
- multiple cooling holes are arranged in a cluster.
- the cluster is arranged near a trailing edge of the airfoil on a pressure side.
- the cluster is arranged within about three inches (76.2 mm) of an aft edge of the platform.
- the cluster is within about 0.6 inch (15.2 mm) of the second lateral edge.
- the cooling holes each have a diameter equivalent of 0.010-0.050 inch (0.25-1.27 mm).
- the first angle is 1-20°.
- the first angle is 2-15°.
- the tapered surface extends within about three inches (76.2 mm) of the first circumferential edge to an aft edge of the platform.
- the tapered surface extends less that 0.7 inch (17.78 mm) from the first circumferential edge.
- the airfoil is a turbine blade.
- an array of airfoils for a gas turbine engine includes adjacent airfoils.
- Each airfoil extends from a platform that has first and second circumferential sides respectively that extend to first and second circumferential edges.
- the first circumferential side has a tapered surface at a first angle relative to a flow path surface.
- the second circumferential surface has a cooling hole that extends toward the second lateral edge at a second angle relative to the flow path surface.
- the tapered surface and the cooling hole are axially aligned with one another.
- the airfoils include a cooling passage.
- the cooling hole is in fluid communication with the cooling passage.
- the second angle is 5-40° and comprises multiple cooling holes that are arranged in a cluster.
- the cluster is arranged near a trailing edge of the airfoil on a pressure side.
- the cluster is arranged within about three inches (76.2 mm) of an aft edge of the platform.
- the cluster is within about 0.6 inch (15.2 mm) of the second lateral edge.
- the cooling holes each have a diameter equivalent of 0.010-0.050 inch (0.25-1.27 mm).
- the first angle is 1-20°.
- the tapered surface extends within about three inches (76.2 mm) of the first circumferential edge to an aft edge of the platform.
- the tapered surface extends less that 0.7 inch (17.78 mm) from the first circumferential edge.
- the airfoil is a turbine blade.
- FIG. 1 is a schematic cross-sectional view of an example industrial gas turbine engine.
- FIG. 2 schematically illustrates a section of the gas turbine engine, such as a turbine section.
- FIGS. 3A and 3B are perspective and elevational views respectively of adjacent blades.
- FIG. 4 is an elevational view of the blade shown in FIGS. 3A and 3B .
- FIG. 5 is an enlarged cross-sectional view of the adjacent blades.
- FIG. 1 A schematic view of an industrial gas turbine engine 10 is illustrated in FIG. 1 .
- the engine 10 includes a compressor section 12 and a turbine section 14 interconnected to one another by a shaft 16 rotatable about an axis X.
- a combustor 18 is arranged between the compressor and turbine sections 12 , 14 .
- a generator 22 is rotationally driven by a shaft coupled to the turbine or uncoupled via a power turbine 20 , which is connected to a power grid 23 .
- the illustrated engine 10 is highly schematic, and may vary from the configuration illustrated.
- the disclosed airfoil may be used in commercial and military aircraft engines as well as industrial gas turbine engines.
- the turbine section 14 includes multiple turbine blades, one of which is illustrated at 64 in FIG. 2 .
- first and second arrays of circumferentially spaced fixed vanes 60 , 62 are axially spaced apart from one another.
- a first stage array of circumferentially spaced turbine blades 64 mounted to a rotor disk 68 , is arranged axially between the first and second fixed vane arrays.
- a second stage array of circumferentially spaced turbine blades 66 is arranged aft of the second array of fixed vanes 62 . It should be understood that any number of stages may be used.
- the disclosed airfoil may be used in a compressor section, turbine section and/or fixed or rotating stages.
- the turbine blades each include a tip 80 adjacent to a blade outer air seal 70 of a case structure 72 , which provides an outer flow path.
- the first and second stage arrays of turbine vanes and first and second stage arrays of turbine blades are arranged within a core flow path C and are operatively connected to the shaft 16 , for example.
- Each blade 64 includes an inner platform 76 respectively defining an inner flow path.
- the platform inner platform 76 supports an airfoil 78 that extends in a radial direction R. It should be understood that the turbine blades may be discrete from one another or arranged in integrated clusters.
- the airfoil 78 provides leading and trailing edges 82 , 84 .
- the airfoil 78 is provided between pressure (typically concave) and suction (typically convex) sides in circumferential direction Y ( FIG. 4 ) provided between the leading and trailing edges 82 , 84 .
- the turbine blades 64 are constructed from a high strength, heat resistant material such as a nickel-based or cobalt-based superalloy, or of a high temperature, stress resistant ceramic or composite material. In cooled configurations, internal fluid passages and external cooling apertures provide for a combination of impingement and film cooling. Other cooling approaches may be used such as trip strips, pedestals or other convective cooling techniques. In addition, one or more thermal barrier coatings, abrasion-resistant coatings or other protective coatings may be applied to the turbine vane 64 .
- the airfoil 78 extends from the platform 76 and provides first and second circumferential sides, which corresponds to pressure and suction sides 86 , 88 , as shown in Figure 4 .
- the first and second circumferential sides 86 , 88 include first and second circumferential edges 92 , 94 , respectively.
- This first circumferential side 86 has a tapered surface 90 at a first angle 100 relative to the flowpath surface provided by the platform 76 .
- the first angle is 1-20 degrees, and in another example, 2-15 degrees. In still another example, the first angle is 2-12 degrees.
- the tapered surface 90 extends within about three inches (76.2 mm) of the first circumferential edge 92 to an aft edge 120 of the platform 76 .
- the tapered surface 90 extends a width 108 less that 0.7 inch (17.78 mm) from the first edge 92 .
- the second circumferential surface 88 has at least one cooling hole 98 , for example, a cluster of cooling holes, extending toward the second circumferential edge 92 at a second angle 96 relative to the flowpath surface.
- the airfoil 78 includes a cooling passage 99 in fluid communication with the cooling hole 98 .
- the second angle 96 is 5-40 degrees, in another example, the second angle 96 is 15-30 degrees.
- the tapered surface 90 and the cooling hole 98 are axially aligned with one another such that cooling fluid from the cooling hole 98 is directed toward the tapered surface 90 .
- the cooling arrangement provides for a more effective platform cooling. The relationship between these features and adjacent blades is shown in FIGS. 3A-3B .
- the cluster of cooling holes 98 is arranged within about 3 inches (76.2 mm) of an aft edge 120 of the platform 76 .
- the cluster is within about 0.60 inch (15.2 mm) of the second lateral edge 90 .
- a lateral offset 110 is about 0.60 inch (15.2 mm), and a lateral width 112 is at least 0.010 inch (0.25 mm).
- Each cooling hole 98 has an effective diameter, or diameter equivalent of 0.010-0.050 inch (0.25 -1.27 mm).
- the cluster includes an axial offset 114 from the aft edge 120 of about 1 inch (25.4 mm) and may extend a distance 116 , which is less than three inches (76.2 mm).
- the cooling holes may be round or shaped.
- the holes may have a uniform cross-section or may be shaped as diffusers.
- a seal 118 may be provided between adjacent blades 64 to obstruct the gap provided between the facing circumferential edges 92 , 94 .
- the seal 118 is schematically illustrated and may be provided using any suitable arrangement.
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- Engineering & Computer Science (AREA)
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
An airfoil for a gas turbine engine includes an airfoil that extends from a platform that has first and second circumferential sides that respectively extend to first and second circumferential edges. The first circumferential side has a tapered surface at a first angle relative to a flow path surface. The second circumferential surface has a cooling hole that extends toward the second lateral edge at a second angle relative to the flow path surface. The tapered surface and the cooling hole are axially aligned with one another.
Description
- This application claims priority to U.S. Provisional Application No. 62/008,599 which was filed on Jun. 6, 2014 and is incorporated herein by reference.
- This disclosure relates to a gas turbine engine airfoil, and more particularly, a platform cooling arrangement.
- Industrial gas turbine engines include a compressor section, a combustor section and a turbine section. Air entering the compressor section is compressed and delivered into the combustor section where it is mixed with fuel and ignited to generate a high-speed exhaust gas flow. The high-speed exhaust gas flow expands through the turbine section to drive the compressor and a power turbine. The compressor and turbine sections each included multiple circumferential arrays of blades and vanes.
- The turbine section in particular is subject to high temperatures that may exceed the melting temperature of the components. To this end, these components are cooled by one or more cooling mechanisms. Airfoils extend from a platform, and in the case of a blade, an inner platform supported by a root section. The airfoil and platform typically included cooling holes to supply cooling fluid to the hotter areas of the blade.
- As gas turbine engines are pushed to higher temperatures to increase power output and efficiency, distress of the airfoil platforms increasingly becomes the service life limiting area. A typical solution to this includes decreasing the platform metal temperatures with cooling air. One approach includes providing platform cooling holes supplied with “wheel-space air,” which corresponds to fluid provided between adjacent turbine blade shanks. This approach may supply insufficient pressure needed for adequate film cooling to the local and adjacent platform. Another approach includes providing cooling to the platform mate faces, or facing edges, supplied by cooling air from the airfoil core and/or “wheel-space air.” This approach may not provide film cooling and subjects the area to cracking due to reduced wall thickness.
- In one exemplary embodiment, an airfoil for a gas turbine engine includes an airfoil that extends from a platform that has first and second circumferential sides that respectively extend to first and second circumferential edges. The first circumferential side has a tapered surface at a first angle relative to a flow path surface. The second circumferential surface has a cooling hole that extends toward the second lateral edge at a second angle relative to the flow path surface. The tapered surface and the cooling hole are axially aligned with one another.
- In a further embodiment of the above, the airfoil includes a cooling passage. The cooling hole is in fluid communication with the cooling hole.
- In a further embodiment of any of the above, the second angle is 5-40°.
- In a further embodiment of any of the above, the second angle is 15-30°.
- In a further embodiment of any of the above, multiple cooling holes are arranged in a cluster. The cluster is arranged near a trailing edge of the airfoil on a pressure side.
- In a further embodiment of any of the above, the cluster is arranged within about three inches (76.2 mm) of an aft edge of the platform.
- In a further embodiment of any of the above, the cluster is within about 0.6 inch (15.2 mm) of the second lateral edge.
- In a further embodiment of any of the above, the cooling holes each have a diameter equivalent of 0.010-0.050 inch (0.25-1.27 mm).
- In a further embodiment of any of the above, the first angle is 1-20°.
- In a further embodiment of any of the above, the first angle is 2-15°.
- In a further embodiment of any of the above, the tapered surface extends within about three inches (76.2 mm) of the first circumferential edge to an aft edge of the platform.
- In a further embodiment of any of the above, the tapered surface extends less that 0.7 inch (17.78 mm) from the first circumferential edge.
- In a further embodiment of any of the above, the airfoil is a turbine blade.
- In another exemplary embodiment, an array of airfoils for a gas turbine engine includes adjacent airfoils. Each airfoil extends from a platform that has first and second circumferential sides respectively that extend to first and second circumferential edges. The first circumferential side has a tapered surface at a first angle relative to a flow path surface. The second circumferential surface has a cooling hole that extends toward the second lateral edge at a second angle relative to the flow path surface. The tapered surface and the cooling hole are axially aligned with one another.
- In a further embodiment of the above, the airfoils include a cooling passage. The cooling hole is in fluid communication with the cooling passage.
- In a further embodiment of any of the above, the second angle is 5-40° and comprises multiple cooling holes that are arranged in a cluster. The cluster is arranged near a trailing edge of the airfoil on a pressure side.
- In a further embodiment of any of the above, the cluster is arranged within about three inches (76.2 mm) of an aft edge of the platform. The cluster is within about 0.6 inch (15.2 mm) of the second lateral edge. The cooling holes each have a diameter equivalent of 0.010-0.050 inch (0.25-1.27 mm).
- In a further embodiment of any of the above, the first angle is 1-20°.
- In a further embodiment of any of the above, the tapered surface extends within about three inches (76.2 mm) of the first circumferential edge to an aft edge of the platform. The tapered surface extends less that 0.7 inch (17.78 mm) from the first circumferential edge.
- In a further embodiment of any of the above, the airfoil is a turbine blade.
- The disclosure can be further understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
-
FIG. 1 is a schematic cross-sectional view of an example industrial gas turbine engine. -
FIG. 2 schematically illustrates a section of the gas turbine engine, such as a turbine section. -
FIGS. 3A and 3B are perspective and elevational views respectively of adjacent blades. -
FIG. 4 is an elevational view of the blade shown inFIGS. 3A and 3B . -
FIG. 5 is an enlarged cross-sectional view of the adjacent blades. - The embodiments, examples and alternatives of the preceding paragraphs, the claims, or the following description and drawings, including any of their various aspects or respective individual features, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible.
- A schematic view of an industrial
gas turbine engine 10 is illustrated inFIG. 1 . Theengine 10 includes acompressor section 12 and aturbine section 14 interconnected to one another by ashaft 16 rotatable about an axis X. Acombustor 18 is arranged between the compressor andturbine sections generator 22 is rotationally driven by a shaft coupled to the turbine or uncoupled via apower turbine 20, which is connected to a power grid 23. It should be understood that the illustratedengine 10 is highly schematic, and may vary from the configuration illustrated. Moreover, the disclosed airfoil may be used in commercial and military aircraft engines as well as industrial gas turbine engines. - The
turbine section 14 includes multiple turbine blades, one of which is illustrated at 64 inFIG. 2 . In theexample turbine section 14, first and second arrays of circumferentially spaced fixedvanes turbine blades 64, mounted to arotor disk 68, is arranged axially between the first and second fixed vane arrays. A second stage array of circumferentially spacedturbine blades 66 is arranged aft of the second array of fixedvanes 62. It should be understood that any number of stages may be used. Moreover, the disclosed airfoil may be used in a compressor section, turbine section and/or fixed or rotating stages. - The turbine blades each include a
tip 80 adjacent to a bladeouter air seal 70 of acase structure 72, which provides an outer flow path. The first and second stage arrays of turbine vanes and first and second stage arrays of turbine blades are arranged within a core flow path C and are operatively connected to theshaft 16, for example. - Each
blade 64 includes aninner platform 76 respectively defining an inner flow path. The platforminner platform 76 supports anairfoil 78 that extends in a radial direction R. It should be understood that the turbine blades may be discrete from one another or arranged in integrated clusters. Theairfoil 78 provides leading and trailingedges - The
airfoil 78 is provided between pressure (typically concave) and suction (typically convex) sides in circumferential direction Y (FIG. 4 ) provided between the leading and trailingedges turbine blades 64 are constructed from a high strength, heat resistant material such as a nickel-based or cobalt-based superalloy, or of a high temperature, stress resistant ceramic or composite material. In cooled configurations, internal fluid passages and external cooling apertures provide for a combination of impingement and film cooling. Other cooling approaches may be used such as trip strips, pedestals or other convective cooling techniques. In addition, one or more thermal barrier coatings, abrasion-resistant coatings or other protective coatings may be applied to theturbine vane 64. - The
airfoil 78 extends from theplatform 76 and provides first and second circumferential sides, which corresponds to pressure andsuction sides FIG. 4 , the first and secondcircumferential sides circumferential edges circumferential side 86 has a taperedsurface 90 at afirst angle 100 relative to the flowpath surface provided by theplatform 76. The first angle is 1-20 degrees, and in another example, 2-15 degrees. In still another example, the first angle is 2-12 degrees. - The tapered
surface 90 extends within about three inches (76.2 mm) of the firstcircumferential edge 92 to anaft edge 120 of theplatform 76. The taperedsurface 90 extends awidth 108 less that 0.7 inch (17.78 mm) from thefirst edge 92. - The second
circumferential surface 88 has at least onecooling hole 98, for example, a cluster of cooling holes, extending toward the secondcircumferential edge 92 at asecond angle 96 relative to the flowpath surface. As shown inFIG. 5 , theairfoil 78 includes acooling passage 99 in fluid communication with thecooling hole 98. In one example, thesecond angle 96 is 5-40 degrees, in another example, thesecond angle 96 is 15-30 degrees. - The tapered
surface 90 and thecooling hole 98 are axially aligned with one another such that cooling fluid from thecooling hole 98 is directed toward the taperedsurface 90. The cooling arrangement provides for a more effective platform cooling. The relationship between these features and adjacent blades is shown inFIGS. 3A-3B . - The cluster of cooling holes 98 is arranged within about 3 inches (76.2 mm) of an
aft edge 120 of theplatform 76. The cluster is within about 0.60 inch (15.2 mm) of the secondlateral edge 90. A lateral offset 110 is about 0.60 inch (15.2 mm), and alateral width 112 is at least 0.010 inch (0.25 mm). Each coolinghole 98 has an effective diameter, or diameter equivalent of 0.010-0.050 inch (0.25 -1.27 mm). The cluster includes an axial offset 114 from theaft edge 120 of about 1 inch (25.4 mm) and may extend a distance 116, which is less than three inches (76.2 mm). The cooling holes may be round or shaped. The holes may have a uniform cross-section or may be shaped as diffusers. - A
seal 118 may be provided betweenadjacent blades 64 to obstruct the gap provided between the facingcircumferential edges seal 118 is schematically illustrated and may be provided using any suitable arrangement. - It should also be understood that although a particular component arrangement is disclosed in the illustrated embodiment, other arrangements will benefit herefrom. Although particular step sequences are shown, described, and claimed, it should be understood that steps may be performed in any order, separated or combined unless otherwise indicated and will still benefit from the present invention.
- Although the different examples have specific components shown in the illustrations, embodiments of this invention are not limited to those particular combinations. It is possible to use some of the components or features from one of the examples in combination with features or components from another one of the examples.
- Although an example embodiment has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of the claims. For that reason, the following claims should be studied to determine their true scope and content.
Claims (20)
1. An airfoil for a gas turbine engine comprising:
an airfoil extending from a platform that has first and second circumferential sides respectively extending to first and second circumferential edges, the first circumferential side having a tapered surface at a first angle relative to a flow path surface, and the second circumferential surface having a cooling hole extending toward the second lateral edge at a second angle relative to the flow path surface, the tapered surface and the cooling hole axially aligned with one another.
2. The airfoil according to claim 1 , wherein the airfoil includes a cooling passage, the cooling hole in fluid communication with the cooling hole.
3. The airfoil according to claim 2 , wherein the second angle is 5-40°.
4. The airfoil according to claim 3 , wherein the second angle is 15-30°.
5. The airfoil according to claim 2 , comprising multiple cooling holes arranged in a cluster, the cluster arranged near a trailing edge of the airfoil on a pressure side.
6. The airfoil according to claim 5 , wherein the cluster is arranged within about three inches (76.2 mm) of an aft edge of the platform.
7. The airfoil according to claim 5 , wherein the cluster is within about 0.6 inch (15.2 mm) of the second lateral edge.
8. The airfoil according to claim 5 , wherein the cooling holes each have a diameter equivalent of 0.010-0.050 inch (0.25-1.27 mm).
9. The airfoil according to claim 1 , wherein the first angle is 1-20°.
10. The airfoil according to claim 9 , wherein the first angle is 2-15°.
11. The airfoil according to claim 9 , wherein the tapered surface extends within about three inches (76.2 mm) of the first circumferential edge to an aft edge of the platform.
12. The airfoil according to claim 11 , wherein the tapered surface extends less that 0.7 inch (17.78 mm) from the first circumferential edge.
13. The airfoil according to claim 1 , wherein the airfoil is a turbine blade.
14. An array of airfoils for a gas turbine engine comprising:
adjacent airfoils, each airfoil extending from a platform that has first and second circumferential sides respectively extending to first and second circumferential edges, the first circumferential side having a tapered surface at a first angle relative to a flow path surface, and the second circumferential surface having a cooling hole extending toward the second lateral edge at a second angle relative to the flow path surface, the tapered surface and the cooling hole axially aligned with one another.
15. The array of airfoils according to claim 14 , wherein the airfoils includes a cooling passage, the cooling hole in fluid communication with the cooling passage.
16. The array of airfoils according to claim 15 , wherein the second angle is 5-40°, and comprising multiple cooling holes arranged in a cluster, the cluster arranged near a trailing edge of the airfoil on a pressure side.
17. The array of airfoils according to claim 16 , wherein the cluster is arranged within about three inches (76.2 mm) of an aft edge of the platform, the cluster is within about 0.6 inch (15.2 mm) of the second lateral edge, wherein the cooling holes each have a diameter equivalent of 0.010-0.050 inch (0.25-1.27 mm).
18. The array of airfoils according to claim 16 , wherein the first angle is 1-20°.
19. The array of airfoils according to claim 18 , wherein the tapered surface extends within about three inches (76.2 mm) of the first circumferential edge to an aft edge of the platform, wherein the tapered surface extends less that 0.7 inch (17.78 mm) from the first circumferential edge.
20. The array of airfoils according to claim 14 , wherein the airfoil is a turbine blade.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/728,568 US20150354369A1 (en) | 2014-06-06 | 2015-06-02 | Gas turbine engine airfoil platform cooling |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201462008599P | 2014-06-06 | 2014-06-06 | |
US14/728,568 US20150354369A1 (en) | 2014-06-06 | 2015-06-02 | Gas turbine engine airfoil platform cooling |
Publications (1)
Publication Number | Publication Date |
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US20150354369A1 true US20150354369A1 (en) | 2015-12-10 |
Family
ID=53284103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/728,568 Abandoned US20150354369A1 (en) | 2014-06-06 | 2015-06-02 | Gas turbine engine airfoil platform cooling |
Country Status (2)
Country | Link |
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US (1) | US20150354369A1 (en) |
EP (1) | EP2952682A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11668195B2 (en) * | 2020-02-14 | 2023-06-06 | Doosan Enerbility Co., Ltd. | Gas turbine blade for re-using cooling air and turbomachine assembly and gas turbine comprising the same |
US20230203954A1 (en) * | 2021-12-27 | 2023-06-29 | Rolls-Royce Plc | Turbine blade |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8231348B2 (en) * | 2007-02-21 | 2012-07-31 | Mitsubishi Heavy Industries, Ltd. | Platform cooling structure for gas turbine moving blade |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0902167B1 (en) * | 1997-09-15 | 2003-10-29 | ALSTOM (Switzerland) Ltd | Cooling device for gas turbine components |
-
2015
- 2015-06-02 US US14/728,568 patent/US20150354369A1/en not_active Abandoned
- 2015-06-04 EP EP15170627.2A patent/EP2952682A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8231348B2 (en) * | 2007-02-21 | 2012-07-31 | Mitsubishi Heavy Industries, Ltd. | Platform cooling structure for gas turbine moving blade |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11668195B2 (en) * | 2020-02-14 | 2023-06-06 | Doosan Enerbility Co., Ltd. | Gas turbine blade for re-using cooling air and turbomachine assembly and gas turbine comprising the same |
US20230203954A1 (en) * | 2021-12-27 | 2023-06-29 | Rolls-Royce Plc | Turbine blade |
US11739647B2 (en) * | 2021-12-27 | 2023-08-29 | Rolls-Royce Plc | Turbine blade |
Also Published As
Publication number | Publication date |
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EP2952682A1 (en) | 2015-12-09 |
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