US20110097188A1 - Structure and method for improving film cooling using shallow trench with holes oriented along length of trench - Google Patents
Structure and method for improving film cooling using shallow trench with holes oriented along length of trench Download PDFInfo
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- US20110097188A1 US20110097188A1 US12/604,460 US60446009A US2011097188A1 US 20110097188 A1 US20110097188 A1 US 20110097188A1 US 60446009 A US60446009 A US 60446009A US 2011097188 A1 US2011097188 A1 US 2011097188A1
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- Prior art keywords
- trench
- film
- turbine airfoil
- shallow trench
- degrees
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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
- 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
- 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
Definitions
- the invention relates generally to film-cooled parts and more particularly to a method of film cooling common locations on virtually all cooled turbine airfoils.
- Film cooling refers to a technique for cooling a part in which cool air is discharged through a plurality of small holes in the external walls of the part to provide a relatively thin, cool layer or barrier along the external surface of the part and prevent or reduce direct contact with hot gasses.
- Common locations employed to cool turbine airfoils include, among others, the airfoil leading edge showerhead film and film holes on forward endwall regions.
- One common cooling technique utilizes rows of axially round holes inside a shallow trench in which the axis of each hole is oriented substantially transverse to the lengthwise direction of the trench. The use of a shallow trench increases spreading of the film cooling, making the film cooling less susceptible to freestream turbulence effects, and also tolerant to effects due to deposits on the surface.
- a turbine airfoil is configured with at least one shallow trench, each trench comprising a plurality of film holes disposed therein and located along the lengthwise direction of the corresponding trench and angled through a corresponding airfoil substrate substantially in the lengthwise direction of the corresponding trench.
- a method of film cooling a turbine airfoil comprises:
- each film cooling hole having a central axis oriented substantially in the lengthwise direction of the corresponding trench such that film jets emanating from the plurality of film cooling holes issue into the corresponding trench substantially parallel to the lengthwise direction of the corresponding trench.
- a film-cooled aerodynamic component comprises at least one shallow trench having a length and a width, each trench comprising a plurality of film holes disposed therein along the lengthwise direction of the trench, each film hole angled through the aerodynamic component substantially in the lengthwise direction of the corresponding trench.
- FIG. 1 is a perspective view illustrating a plurality of film-cooling holes inside a shallow trench known in the art
- FIG. 2 illustrates the angular relationship between the shallow trench walls and the central axis of a film-cooling hole depicted in FIG. 1 depicting in further detail;
- FIG. 3 is a perspective view illustrating film-cooling flow due to lateral flow blockage for the film-cooling holes shown in FIG. 1 ;
- FIG. 4 is a perspective view illustrating a plurality of film-cooling holes inside a shallow trench in which each hole includes a central axis oriented in the lengthwise direction of the trench according to one embodiment
- FIG. 5 illustrates a plurality of film-cooling holes inside corresponding shall trenches applied to a showerhead film cooled region of a turbine airfoil according to one embodiment
- FIG. 6 is an end view of the film-cooling holes depicted in FIG. 4 ;
- FIG. 7 is a view transverse to the lengthwise direction of the shallow trench depicted in FIGS. 4 and 6 showing another view of the central axis of a film-cooling hole oriented in the lengthwise direction of the trench.
- FIG. 1 is a perspective view of an airfoil part 10 illustrating a plurality of film-cooling holes 12 inside a shallow trench 14 known in the art.
- Part 10 is cooled by a fluid coolant passing through an interior of the part 10 .
- the fluid coolant may be compressor extraction air or another fluid having known thermodynamic properties such as nitrogen.
- Some of the coolant passes through film-cooling holes 12 to an exterior of part 10 .
- Part 10 may have several such shallow trenches, though only one is shown here for purposes of illustration.
- FIG. 2 illustrates an end view of the trench 14 depicted in FIG. 1 showing the angular relationship between the shallow trench 14 side walls 16 and the central axis 18 of each film-cooling hole 12 .
- Hot gases 30 shown in FIG. 3 flow in a direction transverse to the lengthwise direction of channel 14 .
- Coolant passes out through film-cooling holes 12 in a direction substantially parallel to the flow of the hot gases 30 , spreads within the trench 14 prior to coming out of the trench, and cooling airfoil part 10 .
- FIG. 3 is a perspective view illustrating film-cooling flow 32 due to lateral flow blockage for the film-cooling holes 12 shown in FIG. 1 .
- FIG. 4 is a perspective view illustrating a plurality of film-cooling holes 42 inside a shallow trench 14 located on an airfoil part 40 in which each hole 42 includes a central axis 44 oriented in the lengthwise direction 46 of the trench 14 according to one embodiment.
- Part 40 is cooled by a fluid coolant passing through an interior of the part 40 .
- the fluid coolant may be compressor extraction air or another fluid having known thermodynamic properties such as nitrogen.
- Some of the coolant passes through film-cooling holes 12 to an exterior of part 40 .
- Part 40 may have several such shallow trenches, though only one is shown here for purposes of illustration.
- Hot gases may flow in any direction relative to the lengthwise direction 46 of shallow trench 14 , but the majority of applications will have hot gases flowing substantially transverse to the lengthwise direction 46 of shallow trench 14 .
- Coolant passes out through film-cooling holes 42 in a direction substantially parallel to the lengthwise direction 46 , filling the trench 14 prior to exiting the trench, and cooling airfoil part 40 .
- each film-cooling hole 42 is substantially parallel with the shallow trench 14 side walls 16 , substantially all of the coolant exiting the film-cooling holes 42 is allowed to fill in the length of the trench 14 and avoid immediate mixing with the hot gases, thereby also exiting the trench 14 as a more continuous cooling layer in the lengthwise direction 46 of airfoil part 10 to maximize optimization of airfoil part 40 cooling.
- FIG. 5 illustrates a plurality of film-cooling holes 42 inside corresponding shallow trenches 14 applied to a showerhead film cooled region 50 of a turbine airfoil part according to one embodiment.
- Each film-cooling hole 42 has a central axis oriented substantially in the lengthwise direction 46 of the corresponding shallow trench 14 and substantially parallel to the side walls 16 of the corresponding shallow trench 14 .
- FIG. 6 is an end view of the film-cooling holes 42 inside the shallow trench 14 located on the airfoil part 40 .
- a substrate 60 represents the wall of an airfoil part which requires cooling on one or more surfaces, e.g., the wall of airfoil part 40 in FIG. 4 .
- the substrate 60 includes hot surface 62 and cooler surface 64 .
- Combustion gases enumerated 30 in FIG. 3 are conventionally channeled over the airfoil part 40 , i.e., over coated surface 73 .
- Coolant air 32 flows upwardly from the cooler surface through film cooling holes 42 .
- the holes have an average throat diameter 76 .
- Substrate 60 is partially coated with a bond layer 70 and an overlying thermal bather coating (TBC) 72 .
- TBC thermal bather coating
- shallow trench 14 is formed within the bond layer 70 and TBC 72 , and has a desired depth.
- the side-walls 16 of the shallow trench 14 are substantially perpendicular to surface 62 of the substrate 60 . (Thus, the side-walls 16 are usually substantially perpendicular to the bottom surface 80 of trench 14 ).
- the centerline 44 of the film cooling holes 42 is oriented between about 15 degrees and about 50 degrees relative to the bottom surface 80 of the trench 14 illustrated in FIG. 7 .
- the centerline of the film cooling holes 42 is oriented between about 20 degrees and about 35 degrees relative to the bottom surface 80 of the trench 14 .
- the width of the trench 14 is substantially equal to the maximum exit width of the film cooling hole 42 according to one aspect of the invention. If a film cooling hole is perfectly aligned in the lengthwise direction of its corresponding trench, then the width is equal to the film cooling hole diameter for a round hole. If the film cooling hole 42 is aligned somewhat off angle, such as up to 20 degrees, then the width would be greater.
- the trench width can be greater than the film hole exit and still work well to achieve the desired cooling results according to the principles described herein, whether the film hole is perfectly aligned or not.
- One embodiment employs a trench width from about 1.0 to about 1.5 times the maximum exit footprint width of its corresponding film cooling holes 42 .
- a trench 14 need not have perfect square-edged features. Any one or more of the top corners of the trench 14 can be somewhat rounded or chamfered, and any one or more of the internal corners of the trench 14 can have small fillets.
- the depth of the shallow trench 14 is less than the average throat diameter of the film cooling holes 42 . In other embodiments, the depth of the shallow trench 14 is less than about 50% of the average throat diameter of the film cooling holes 42 . These relative dimensions are in marked contrast to deep slots often used in the prior art.
- trench 14 serves as a “spillway” trench for coolant 32 exiting cooling holes 42 .
- Side-walls 16 direct the flow of the coolant 32 .
- the coolant spreads into the trench prior to exiting the trench along hot surface 73 (i.e., surface 62 as-coated).
- the coolant thus stays in close contact with the hot surface, rather than separating from it quickly, as the increased coolant spreading over the hot surface is now less susceptible to freestream turbulence effects, and also is more tolerant to effects due to deposits on the surface. This in turn results in greater cooling effectiveness for the airfoil part 40 as stated herein before.
- FIG. 7 is a view transverse to the lengthwise direction 46 of the shallow trench 14 depicted in FIGS. 4 and 6 showing another view of the central axis 44 of a film-cooling hole 42 oriented in the lengthwise direction 46 of the trench 14 .
- a structure and method for improving film cooling for a variety of turbine airfoil locations, including without limitation, the showerhead film and the film holes on the forward endwall regions of a turbine airfoil.
- the use of the shallow trench increases spreading of the film cooling, making the film cooling less susceptible to freestream turbulence effects, and also more tolerant to effects due to deposits on the surface of the turbine airfoil. It shall be understood that the embodiments described herein are in no way restricted to use of round holes and that many other hole shapes may be employed to provide the advantages in accordance with the principles described herein.
- the orientation of film holes generally rows of film holes, angled through the substrate but along the direction of the trench rather than transverse to the direction of the trench (i.e., oriented along the trench width) cause the film jets to issue into the trench without hitting the side walls or other obstructions.
- the coolant flow more easily fills the trench before issuing onto the external component aerodynamic surface as a nearly uniform layer of film cooling.
- This structure is particularly beneficial for rows of film holes that are otherwise constrained by manufacturing to be oriented in fixed directions, such as showerhead film rows that are radial, and also forward endwall film rows that are circumferential (azimuthal).
- Film cooling hole orientation along the length of the trench also benefits film rows with greater spacing between the individual holes, since the trench acts as a buffer region for coolant spreading before the coolant interacts with the hot mainstream gases.
- the shallow trench(s) can be formed in the protective coatings of the component according to one embodiment.
- the shallow trench(s) can be partially in the substrate according to another embodiment.
- These embodiments improve film cooling effectiveness for common airfoil locations that are constrained in geometry and manufacturing. Such regions would not otherwise be able to employ axially oriented film holes or even shaped film hole exits.
- Particular embodiments were found to improve regional airfoil film cooling by about 25% over that achievable with known structures.
- the embodiments described herein provide an advantage in ability to reduce total cooling flow for the turbine and increase efficiency offered commercially.
- bond layers also known as bondcoats, as well as the TBC topcoats can be comprised of multiple layers or compositions.
- the embodiments described herein are not to be limited to a simple bondcoat and topcoat each of one composition only. Exemplary products today use at least a two-layer bondcoat system.
- the shallow trench might be formed only in the topcoat, or into the bondcoat, or even into the substrate, since it depends on the relative thicknesses used.
Abstract
A turbine airfoil includes a plurality of shallow trenches. Each trench includes a plurality of film holes disposed within and located along the lengthwise direction of the trench and angled through an airfoil substrate in the lengthwise direction of the trench.
Description
- The invention relates generally to film-cooled parts and more particularly to a method of film cooling common locations on virtually all cooled turbine airfoils.
- Gas turbines and other high-temperature equipment use film cooling extensively for effective protection of the hot gas path components, such as turbine blades. Film cooling refers to a technique for cooling a part in which cool air is discharged through a plurality of small holes in the external walls of the part to provide a relatively thin, cool layer or barrier along the external surface of the part and prevent or reduce direct contact with hot gasses.
- Common locations employed to cool turbine airfoils include, among others, the airfoil leading edge showerhead film and film holes on forward endwall regions. One common cooling technique utilizes rows of axially round holes inside a shallow trench in which the axis of each hole is oriented substantially transverse to the lengthwise direction of the trench. The use of a shallow trench increases spreading of the film cooling, making the film cooling less susceptible to freestream turbulence effects, and also tolerant to effects due to deposits on the surface.
- These known turbine airfoil film cooling techniques using shallow trenches improve film cooling effectiveness over prior film cooling techniques that employ film holes in the absence of shallow trenches. It would be advantageous to provide a next generation of turbine airfoil film cooling that improves film cooling effectiveness beyond that achievable using known turbine airfoil film cooling techniques that employ shallow trenches.
- Briefly, in accordance with one embodiment, a turbine airfoil is configured with at least one shallow trench, each trench comprising a plurality of film holes disposed therein and located along the lengthwise direction of the corresponding trench and angled through a corresponding airfoil substrate substantially in the lengthwise direction of the corresponding trench.
- According to another embodiment, a method of film cooling a turbine airfoil comprises:
- configuring a turbine airfoil with at least one shallow trench having a lengthwise direction in a desired location; and
- providing a plurality of film cooling holes within each trench, each film cooling hole having a central axis oriented substantially in the lengthwise direction of the corresponding trench such that film jets emanating from the plurality of film cooling holes issue into the corresponding trench substantially parallel to the lengthwise direction of the corresponding trench.
- According to yet another embodiment, a film-cooled aerodynamic component comprises at least one shallow trench having a length and a width, each trench comprising a plurality of film holes disposed therein along the lengthwise direction of the trench, each film hole angled through the aerodynamic component substantially in the lengthwise direction of the corresponding trench.
- These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
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FIG. 1 is a perspective view illustrating a plurality of film-cooling holes inside a shallow trench known in the art; -
FIG. 2 illustrates the angular relationship between the shallow trench walls and the central axis of a film-cooling hole depicted inFIG. 1 depicting in further detail; -
FIG. 3 is a perspective view illustrating film-cooling flow due to lateral flow blockage for the film-cooling holes shown inFIG. 1 ; -
FIG. 4 is a perspective view illustrating a plurality of film-cooling holes inside a shallow trench in which each hole includes a central axis oriented in the lengthwise direction of the trench according to one embodiment; -
FIG. 5 illustrates a plurality of film-cooling holes inside corresponding shall trenches applied to a showerhead film cooled region of a turbine airfoil according to one embodiment; -
FIG. 6 is an end view of the film-cooling holes depicted inFIG. 4 ; and -
FIG. 7 is a view transverse to the lengthwise direction of the shallow trench depicted inFIGS. 4 and 6 showing another view of the central axis of a film-cooling hole oriented in the lengthwise direction of the trench. - While the above-identified drawing figures set forth alternative embodiments, other embodiments of the present invention are also contemplated, as noted in the discussion. In all cases, this disclosure presents illustrated embodiments of the present invention by way of representation and not limitation. Numerous other modifications and embodiments can be devised by those skilled in the art which fall within the scope and spirit of the principles of this invention.
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FIG. 1 is a perspective view of anairfoil part 10 illustrating a plurality of film-cooling holes 12 inside ashallow trench 14 known in the art.Part 10 is cooled by a fluid coolant passing through an interior of thepart 10. The fluid coolant may be compressor extraction air or another fluid having known thermodynamic properties such as nitrogen. Some of the coolant passes through film-cooling holes 12 to an exterior ofpart 10.Part 10 may have several such shallow trenches, though only one is shown here for purposes of illustration. -
FIG. 2 illustrates an end view of thetrench 14 depicted inFIG. 1 showing the angular relationship between theshallow trench 14side walls 16 and thecentral axis 18 of each film-cooling hole 12.Hot gases 30 shown inFIG. 3 flow in a direction transverse to the lengthwise direction ofchannel 14. Coolant passes out through film-cooling holes 12 in a direction substantially parallel to the flow of thehot gases 30, spreads within thetrench 14 prior to coming out of the trench, and coolingairfoil part 10. Because thecentral axis 18 of each film-cooling hole 12 forms an angular relationship with theshallow trench 14side walls 16, some of the coolant exiting the film-cooling holes 12 are blocked or otherwise restricted to prevent the maximum amount ofcoolant 32 from mixing with thehot gases 30 to impede optimization of airfoil part cooling.FIG. 3 is a perspective view illustrating film-cooling flow 32 due to lateral flow blockage for the film-cooling holes 12 shown inFIG. 1 . -
FIG. 4 is a perspective view illustrating a plurality of film-cooling holes 42 inside ashallow trench 14 located on anairfoil part 40 in which eachhole 42 includes acentral axis 44 oriented in thelengthwise direction 46 of thetrench 14 according to one embodiment.Part 40 is cooled by a fluid coolant passing through an interior of thepart 40. The fluid coolant may be compressor extraction air or another fluid having known thermodynamic properties such as nitrogen. Some of the coolant passes through film-cooling holes 12 to an exterior ofpart 40.Part 40 may have several such shallow trenches, though only one is shown here for purposes of illustration. - Hot gases may flow in any direction relative to the
lengthwise direction 46 ofshallow trench 14, but the majority of applications will have hot gases flowing substantially transverse to thelengthwise direction 46 ofshallow trench 14. Coolant passes out through film-cooling holes 42 in a direction substantially parallel to thelengthwise direction 46, filling thetrench 14 prior to exiting the trench, and coolingairfoil part 40. Because thecentral axis 44 of each film-cooling hole 42 is substantially parallel with theshallow trench 14side walls 16, substantially all of the coolant exiting the film-cooling holes 42 is allowed to fill in the length of thetrench 14 and avoid immediate mixing with the hot gases, thereby also exiting thetrench 14 as a more continuous cooling layer in thelengthwise direction 46 ofairfoil part 10 to maximize optimization ofairfoil part 40 cooling. -
FIG. 5 illustrates a plurality of film-cooling holes 42 inside correspondingshallow trenches 14 applied to a showerhead film cooledregion 50 of a turbine airfoil part according to one embodiment. Each film-cooling hole 42 has a central axis oriented substantially in thelengthwise direction 46 of the correspondingshallow trench 14 and substantially parallel to theside walls 16 of the correspondingshallow trench 14. -
FIG. 6 is an end view of the film-cooling holes 42 inside theshallow trench 14 located on theairfoil part 40. Asubstrate 60 represents the wall of an airfoil part which requires cooling on one or more surfaces, e.g., the wall ofairfoil part 40 inFIG. 4 . Thesubstrate 60 includeshot surface 62 andcooler surface 64. Combustion gases enumerated 30 inFIG. 3 are conventionally channeled over theairfoil part 40, i.e., over coatedsurface 73.Coolant air 32 flows upwardly from the cooler surface throughfilm cooling holes 42. The holes have anaverage throat diameter 76.Substrate 60 is partially coated with abond layer 70 and an overlying thermal bather coating (TBC) 72. In this embodiment,shallow trench 14 is formed within thebond layer 70 andTBC 72, and has a desired depth. Usually (but not always), the side-walls 16 of theshallow trench 14 are substantially perpendicular tosurface 62 of thesubstrate 60. (Thus, the side-walls 16 are usually substantially perpendicular to thebottom surface 80 of trench 14). - According to one embodiment, the
centerline 44 of thefilm cooling holes 42 is oriented between about 15 degrees and about 50 degrees relative to thebottom surface 80 of thetrench 14 illustrated inFIG. 7 . According to another embodiment, the centerline of thefilm cooling holes 42 is oriented between about 20 degrees and about 35 degrees relative to thebottom surface 80 of thetrench 14. The width of thetrench 14 is substantially equal to the maximum exit width of thefilm cooling hole 42 according to one aspect of the invention. If a film cooling hole is perfectly aligned in the lengthwise direction of its corresponding trench, then the width is equal to the film cooling hole diameter for a round hole. If thefilm cooling hole 42 is aligned somewhat off angle, such as up to 20 degrees, then the width would be greater. It shall be understood that the trench width can be greater than the film hole exit and still work well to achieve the desired cooling results according to the principles described herein, whether the film hole is perfectly aligned or not. One embodiment employs a trench width from about 1.0 to about 1.5 times the maximum exit footprint width of its correspondingfilm cooling holes 42. It shall also be understood that atrench 14 need not have perfect square-edged features. Any one or more of the top corners of thetrench 14 can be somewhat rounded or chamfered, and any one or more of the internal corners of thetrench 14 can have small fillets. - In some embodiments, the depth of the
shallow trench 14 is less than the average throat diameter of the film cooling holes 42. In other embodiments, the depth of theshallow trench 14 is less than about 50% of the average throat diameter of the film cooling holes 42. These relative dimensions are in marked contrast to deep slots often used in the prior art. - As shown in
FIG. 6 ,trench 14 serves as a “spillway” trench forcoolant 32 exiting cooling holes 42. Side-walls 16 direct the flow of thecoolant 32. As a result, the coolant spreads into the trench prior to exiting the trench along hot surface 73 (i.e.,surface 62 as-coated). The coolant thus stays in close contact with the hot surface, rather than separating from it quickly, as the increased coolant spreading over the hot surface is now less susceptible to freestream turbulence effects, and also is more tolerant to effects due to deposits on the surface. This in turn results in greater cooling effectiveness for theairfoil part 40 as stated herein before. -
FIG. 7 is a view transverse to thelengthwise direction 46 of theshallow trench 14 depicted inFIGS. 4 and 6 showing another view of thecentral axis 44 of a film-coolinghole 42 oriented in thelengthwise direction 46 of thetrench 14. - In summary explanation, a structure and method is described herein for improving film cooling for a variety of turbine airfoil locations, including without limitation, the showerhead film and the film holes on the forward endwall regions of a turbine airfoil. Rows of film holes, or with holes oriented axially along the trench width inside shallow trenches, are replaced by holes having corresponding central axis oriented substantially in the lengthwise direction of the corresponding trenches. The use of the shallow trench increases spreading of the film cooling, making the film cooling less susceptible to freestream turbulence effects, and also more tolerant to effects due to deposits on the surface of the turbine airfoil. It shall be understood that the embodiments described herein are in no way restricted to use of round holes and that many other hole shapes may be employed to provide the advantages in accordance with the principles described herein.
- The orientation of film holes, generally rows of film holes, angled through the substrate but along the direction of the trench rather than transverse to the direction of the trench (i.e., oriented along the trench width) cause the film jets to issue into the trench without hitting the side walls or other obstructions. The coolant flow more easily fills the trench before issuing onto the external component aerodynamic surface as a nearly uniform layer of film cooling. This structure is particularly beneficial for rows of film holes that are otherwise constrained by manufacturing to be oriented in fixed directions, such as showerhead film rows that are radial, and also forward endwall film rows that are circumferential (azimuthal). Film cooling hole orientation along the length of the trench also benefits film rows with greater spacing between the individual holes, since the trench acts as a buffer region for coolant spreading before the coolant interacts with the hot mainstream gases.
- The shallow trench(s) can be formed in the protective coatings of the component according to one embodiment. The shallow trench(s) can be partially in the substrate according to another embodiment. These embodiments improve film cooling effectiveness for common airfoil locations that are constrained in geometry and manufacturing. Such regions would not otherwise be able to employ axially oriented film holes or even shaped film hole exits. Particular embodiments were found to improve regional airfoil film cooling by about 25% over that achievable with known structures. The embodiments described herein provide an advantage in ability to reduce total cooling flow for the turbine and increase efficiency offered commercially.
- It shall be understood that bond layers, also known as bondcoats, as well as the TBC topcoats can be comprised of multiple layers or compositions. The embodiments described herein are not to be limited to a simple bondcoat and topcoat each of one composition only. Exemplary products today use at least a two-layer bondcoat system. Furthermore, the shallow trench might be formed only in the topcoat, or into the bondcoat, or even into the substrate, since it depends on the relative thicknesses used.
- While only certain features of the invention have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
Claims (26)
1. A turbine airfoil comprising at least one shallow trench, each trench comprising a plurality of film holes disposed therein as a single row and located along the lengthwise direction of the corresponding trench and angled through a corresponding airfoil substrate substantially in the lengthwise direction of the corresponding trench.
2. The turbine airfoil according to claim 1 , wherein the shallow trench is disposed within a showerhead region of the turbine airfoil.
3. The turbine airfoil according to claim 1 , wherein an angle between a central axis of each hole and the bottom surface of its corresponding trench is between about 15 degrees and about 50 degrees.
4. The turbine airfoil according to claim 1 , wherein an angle between a central axis of each hole and the bottom surface of its corresponding trench is between about 20 degrees and about 35 degrees.
5. The turbine airfoil according to claim 1 , wherein the shallow trench is disposed on a forward endwall region of the turbine airfoil.
6. The turbine airfoil according to claim 1 , wherein the depth of the shallow trench is less than the average throat diameter of the corresponding film cooling holes.
7. The turbine airfoil according to claim 1 , wherein each trench comprises a width substantially equal to the maximum exit width of a corresponding film hole measured in the direction as that which defines the trench width.
8. The turbine airfoil according to claim 1 , wherein each trench comprises a width between about 1.0 and about 1.5 times the maximum exit footprint width of a corresponding film hole.
9. The turbine airfoil according to claim 1 , wherein each trench is substantially rectangular and comprises side walls having an angle between about 70 degrees and about 90 degrees with respect to the bottom surface of the trench.
10. The turbine airfoil according to claim 1 , wherein each trench is substantially rectangular comprising at least one rounded or chamfered top corner and at least one filleted internal corner.
11. A method of film cooling a turbine airfoil, the method comprising:
configuring a turbine airfoil with at least one shallow trench having a lengthwise direction in a desired location; and
providing a plurality of film cooling holes within each trench disposed therein as a single row, each film cooling hole having a central axis oriented substantially in the lengthwise direction of the corresponding trench such that film jets emanating from the plurality of film cooling holes issue into the corresponding trench substantially parallel to the lengthwise direction of the corresponding trench.
12. The method according to claim 11 , wherein at least one shallow trench is disposed within a showerhead region of the turbine airfoil.
13. The method according to claim 11 , wherein at least one shallow trench is disposed on a forward endwall region of the turbine airfoil.
14. The method according to claim 11 , wherein configuring a turbine airfoil with at least one shallow trench comprises configuring the depth of each shallow trench to be less than the average throat diameter of the corresponding film cooling holes.
15. A film-cooled aerodynamic component comprising at least one shallow trench having a length and a width, each trench comprising a plurality of film holes disposed therein as a single row along the lengthwise direction of the trench, each film hole angled through the aerodynamic component substantially in the lengthwise direction of the corresponding trench.
16. The film-cooled aerodynamic component according to claim 15 , further comprising:
an aerodynamic component substrate;
a bond layer bonded to a surface of the aerodynamic component substrate; and
an overlying thermal barrier coating attached to the opposite side of the bond layer, wherein the shallow trench penetrates the bond layer and the overlying thermal barrier coating, and further wherein each film hole penetrates the aerodynamic component substrate.
17. The film-cooled aerodynamic component according to claim 15 , wherein the shallow trench further partially penetrates the substrate.
18. The film-cooled aerodynamic component according to claim 15 , wherein at least one shallow trench is disposed within a showerhead region of a turbine airfoil.
19. The film-cooled aerodynamic component according to claim 15 , wherein at least one shallow trench is disposed on a forward endwall region of a turbine airfoil.
20. The film-cooled aerodynamic component according to claim 15 , wherein an angle between a central axis of each hole and the bottom surface of its corresponding trench is between about 15 degrees and about 50 degrees.
21. The film-cooled aerodynamic component according to claim 15 , wherein an angle between a central axis of each hole and the bottom surface of its corresponding trench is between about 20 degrees and about 35 degrees.
22. The film-cooled aerodynamic component according to claim 15 , wherein the depth of each shallow trench is less than the average throat diameter of the corresponding film cooling holes.
23. The film-cooled aerodynamic component according to claim 15 , wherein each trench comprises a width substantially equal to the maximum exit width of a corresponding film hole measured in the direction as that which defines the trench width.
24. The film-cooled aerodynamic component according to claim 15 , wherein each trench comprises a width between about 1.0 and about 1.5 times the maximum exit footprint width of a corresponding film hole.
25. The film-cooled aerodynamic component according to claim 15 , wherein each trench is substantially rectangular and comprises side walls having an angle between about 70 degrees and about 90 degrees with respect to the bottom surface of the trench.
26. The turbine airfoil according to claim 15 , wherein each trench is substantially rectangular comprising at least one rounded or chamfered top corner and at least one filleted internal corner.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/604,460 US20110097188A1 (en) | 2009-10-23 | 2009-10-23 | Structure and method for improving film cooling using shallow trench with holes oriented along length of trench |
DE102010038131A DE102010038131A1 (en) | 2009-10-23 | 2010-10-12 | Structure and method for improving film cooling using a shallow trench with holes arranged along the longitudinal direction of the trench |
JP2010234132A JP5723134B2 (en) | 2009-10-23 | 2010-10-19 | Structure and method for improving film cooling using shallow trenches with holes oriented along the length of the trench |
CH01707/10A CH702110B1 (en) | 2009-10-23 | 2010-10-19 | Structure for improving film cooling using a shallow trench along the longitudinal direction of the trench arranged film cooling holes. |
CN201010533889.1A CN102042042B (en) | 2009-10-23 | 2010-10-22 | Improve structure and the method for film cooling |
Applications Claiming Priority (1)
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US12/604,460 US20110097188A1 (en) | 2009-10-23 | 2009-10-23 | Structure and method for improving film cooling using shallow trench with holes oriented along length of trench |
Publications (1)
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US20110097188A1 true US20110097188A1 (en) | 2011-04-28 |
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US12/604,460 Abandoned US20110097188A1 (en) | 2009-10-23 | 2009-10-23 | Structure and method for improving film cooling using shallow trench with holes oriented along length of trench |
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Country | Link |
---|---|
US (1) | US20110097188A1 (en) |
JP (1) | JP5723134B2 (en) |
CN (1) | CN102042042B (en) |
CH (1) | CH702110B1 (en) |
DE (1) | DE102010038131A1 (en) |
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US20090246011A1 (en) * | 2008-03-25 | 2009-10-01 | General Electric Company | Film cooling of turbine components |
US20100329846A1 (en) * | 2009-06-24 | 2010-12-30 | Honeywell International Inc. | Turbine engine components |
US20110123312A1 (en) * | 2009-11-25 | 2011-05-26 | Honeywell International Inc. | Gas turbine engine components with improved film cooling |
US20120076644A1 (en) * | 2010-09-23 | 2012-03-29 | Zuniga Humberto A | Cooled component wall in a turbine engine |
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US8628293B2 (en) | 2010-06-17 | 2014-01-14 | Honeywell International Inc. | Gas turbine engine components with cooling hole trenches |
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US8777571B1 (en) * | 2011-12-10 | 2014-07-15 | Florida Turbine Technologies, Inc. | Turbine airfoil with curved diffusion film cooling slot |
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US9080451B2 (en) | 2012-06-28 | 2015-07-14 | General Electric Company | Airfoil |
US20150292334A1 (en) * | 2012-04-05 | 2015-10-15 | United Technologies Corporation | Turbine airfoil tip shelf and squealer pocket cooling |
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US20180051570A1 (en) * | 2016-08-22 | 2018-02-22 | Doosan Heavy Industries & Construction Co., Ltd. | Gas turbine blade |
US10053987B2 (en) * | 2012-08-27 | 2018-08-21 | General Electric Company | Components with cooling channels and methods of manufacture |
US10113433B2 (en) | 2012-10-04 | 2018-10-30 | Honeywell International Inc. | Gas turbine engine components with lateral and forward sweep film cooling holes |
US20190271230A1 (en) * | 2018-03-02 | 2019-09-05 | United Technologies Corporation | Airfoil with varying wall thickness |
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US10570747B2 (en) * | 2017-10-02 | 2020-02-25 | DOOSAN Heavy Industries Construction Co., LTD | Enhanced film cooling system |
US10655473B2 (en) | 2012-12-13 | 2020-05-19 | United Technologies Corporation | Gas turbine engine turbine blade leading edge tip trench cooling |
US10704399B2 (en) | 2017-05-31 | 2020-07-07 | General Electric Company | Adaptively opening cooling pathway |
US10760430B2 (en) | 2017-05-31 | 2020-09-01 | General Electric Company | Adaptively opening backup cooling pathway |
US10927680B2 (en) | 2017-05-31 | 2021-02-23 | General Electric Company | Adaptive cover for cooling pathway by additive manufacture |
US11021965B2 (en) | 2016-05-19 | 2021-06-01 | Honeywell International Inc. | Engine components with cooling holes having tailored metering and diffuser portions |
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US20090246011A1 (en) * | 2008-03-25 | 2009-10-01 | General Electric Company | Film cooling of turbine components |
US20100329846A1 (en) * | 2009-06-24 | 2010-12-30 | Honeywell International Inc. | Turbine engine components |
US8371814B2 (en) | 2009-06-24 | 2013-02-12 | Honeywell International Inc. | Turbine engine components |
US20110123312A1 (en) * | 2009-11-25 | 2011-05-26 | Honeywell International Inc. | Gas turbine engine components with improved film cooling |
US8529193B2 (en) | 2009-11-25 | 2013-09-10 | Honeywell International Inc. | Gas turbine engine components with improved film cooling |
US8628293B2 (en) | 2010-06-17 | 2014-01-14 | Honeywell International Inc. | Gas turbine engine components with cooling hole trenches |
US20120076644A1 (en) * | 2010-09-23 | 2012-03-29 | Zuniga Humberto A | Cooled component wall in a turbine engine |
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US8777571B1 (en) * | 2011-12-10 | 2014-07-15 | Florida Turbine Technologies, Inc. | Turbine airfoil with curved diffusion film cooling slot |
US8870535B2 (en) * | 2012-01-13 | 2014-10-28 | General Electric Company | Airfoil |
US8870536B2 (en) * | 2012-01-13 | 2014-10-28 | General Electric Company | Airfoil |
US20130183165A1 (en) * | 2012-01-13 | 2013-07-18 | General Electric Company | Airfoil |
US20130183166A1 (en) * | 2012-01-13 | 2013-07-18 | General Electric Company | Airfoil |
US9429027B2 (en) * | 2012-04-05 | 2016-08-30 | United Technologies Corporation | Turbine airfoil tip shelf and squealer pocket cooling |
US20150292334A1 (en) * | 2012-04-05 | 2015-10-15 | United Technologies Corporation | Turbine airfoil tip shelf and squealer pocket cooling |
US9650900B2 (en) | 2012-05-07 | 2017-05-16 | Honeywell International Inc. | Gas turbine engine components with film cooling holes having cylindrical to multi-lobe configurations |
US9080451B2 (en) | 2012-06-28 | 2015-07-14 | General Electric Company | Airfoil |
US9273561B2 (en) | 2012-08-03 | 2016-03-01 | General Electric Company | Cooling structures for turbine rotor blade tips |
US10053987B2 (en) * | 2012-08-27 | 2018-08-21 | General Electric Company | Components with cooling channels and methods of manufacture |
US10113433B2 (en) | 2012-10-04 | 2018-10-30 | Honeywell International Inc. | Gas turbine engine components with lateral and forward sweep film cooling holes |
US9617859B2 (en) | 2012-10-05 | 2017-04-11 | General Electric Company | Turbine components with passive cooling pathways |
CN103722128A (en) * | 2012-10-12 | 2014-04-16 | 通用电气公司 | Method of making surface cooling channels on a component using lithograhic molding techniques |
US10655473B2 (en) | 2012-12-13 | 2020-05-19 | United Technologies Corporation | Gas turbine engine turbine blade leading edge tip trench cooling |
US9719357B2 (en) | 2013-03-13 | 2017-08-01 | Rolls-Royce Corporation | Trenched cooling hole arrangement for a ceramic matrix composite vane |
US20160369633A1 (en) * | 2013-07-03 | 2016-12-22 | General Electric Company | Trench cooling of airfoil structures |
WO2015047516A1 (en) * | 2013-07-03 | 2015-04-02 | General Electric Company | Trench cooling of airfoil structures |
US10221693B2 (en) | 2013-07-03 | 2019-03-05 | General Electric Company | Trench cooling of airfoil structures |
EP3017148A1 (en) * | 2013-07-03 | 2016-05-11 | General Electric Company | Trench cooling of airfoil structures |
US9441488B1 (en) | 2013-11-07 | 2016-09-13 | United States Of America As Represented By The Secretary Of The Air Force | Film cooling holes for gas turbine airfoils |
US9784123B2 (en) | 2014-01-10 | 2017-10-10 | Genearl Electric Company | Turbine components with bi-material adaptive cooling pathways |
US20160076383A1 (en) * | 2014-09-17 | 2016-03-17 | United Technologies Corporation | Film cooled article |
US11286791B2 (en) | 2016-05-19 | 2022-03-29 | Honeywell International Inc. | Engine components with cooling holes having tailored metering and diffuser portions |
US11021965B2 (en) | 2016-05-19 | 2021-06-01 | Honeywell International Inc. | Engine components with cooling holes having tailored metering and diffuser portions |
US10378361B2 (en) * | 2016-08-22 | 2019-08-13 | DOOSAN Heavy Industries Construction Co., LTD | Gas turbine blade |
US20180051570A1 (en) * | 2016-08-22 | 2018-02-22 | Doosan Heavy Industries & Construction Co., Ltd. | Gas turbine blade |
US10927680B2 (en) | 2017-05-31 | 2021-02-23 | General Electric Company | Adaptive cover for cooling pathway by additive manufacture |
US11041389B2 (en) | 2017-05-31 | 2021-06-22 | General Electric Company | Adaptive cover for cooling pathway by additive manufacture |
US10704399B2 (en) | 2017-05-31 | 2020-07-07 | General Electric Company | Adaptively opening cooling pathway |
US10760430B2 (en) | 2017-05-31 | 2020-09-01 | General Electric Company | Adaptively opening backup cooling pathway |
US11002137B2 (en) * | 2017-10-02 | 2021-05-11 | DOOSAN Heavy Industries Construction Co., LTD | Enhanced film cooling system |
US10570747B2 (en) * | 2017-10-02 | 2020-02-25 | DOOSAN Heavy Industries Construction Co., LTD | Enhanced film cooling system |
US10731474B2 (en) * | 2018-03-02 | 2020-08-04 | Raytheon Technologies Corporation | Airfoil with varying wall thickness |
US20190271230A1 (en) * | 2018-03-02 | 2019-09-05 | United Technologies Corporation | Airfoil with varying wall thickness |
WO2020029531A1 (en) | 2018-08-10 | 2020-02-13 | 中国科学院宁波材料技术与工程研究所 | Turbine blade having composite specially-shaped slotted gas film cooling structure and manufacturing method thereof |
US11352888B2 (en) * | 2018-08-10 | 2022-06-07 | Ningbo Institute Of Materials Technology & Engineering, Chinese Academy Of Sciences | Turbine blade having gas film cooling structure with a composite irregular groove and a method of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
CN102042042B (en) | 2015-08-12 |
JP2011089519A (en) | 2011-05-06 |
CH702110A2 (en) | 2011-04-29 |
CN102042042A (en) | 2011-05-04 |
DE102010038131A1 (en) | 2011-04-28 |
CH702110B1 (en) | 2015-11-13 |
JP5723134B2 (en) | 2015-05-27 |
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