EP2778369A1 - Impingement cooling mechanism, turbine blade, and combustor - Google Patents
Impingement cooling mechanism, turbine blade, and combustor Download PDFInfo
- Publication number
- EP2778369A1 EP2778369A1 EP12847634.8A EP12847634A EP2778369A1 EP 2778369 A1 EP2778369 A1 EP 2778369A1 EP 12847634 A EP12847634 A EP 12847634A EP 2778369 A1 EP2778369 A1 EP 2778369A1
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- EP
- European Patent Office
- Prior art keywords
- impingement
- cooling mechanism
- crossflow
- cooling
- flat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 128
- 239000000112 cooling gas Substances 0.000 claims description 25
- 238000004088 simulation Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 11
- 230000004048 modification Effects 0.000 description 11
- 238000007664 blowing Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/04—Air inlet arrangements
- F23R3/06—Arrangement of apertures along the flame tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/08—Heating, heat-insulating or cooling means
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
- F01D11/20—Actively adjusting tip-clearance
- F01D11/24—Actively adjusting tip-clearance by selectively cooling-heating stator or rotor components
-
- 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
- F01D5/188—Convection cooling with an insert in the blade cavity to guide the cooling fluid, e.g. forming a separation wall
- F01D5/189—Convection cooling with an insert in the blade cavity to guide the cooling fluid, e.g. forming a separation wall the insert having a tubular cross-section, e.g. airfoil shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/002—Wall structures
-
- 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
- F05D2240/11—Shroud seal segments
-
- 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
- F05D2250/11—Two-dimensional triangular
-
- 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
-
- 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
- F05D2250/14—Two-dimensional elliptical
-
- 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
- F05D2250/23—Three-dimensional prismatic
- F05D2250/232—Three-dimensional prismatic conical
-
- 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
- F05D2250/294—Three-dimensional machined; miscellaneous grooved
-
- 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
- F05D2260/201—Heat transfer, e.g. cooling by impingement of a fluid
-
- 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
- F05D2260/2212—Improvement of heat transfer by creating turbulence
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
- F23R2900/03044—Impingement cooled combustion chamber walls or subassemblies
Definitions
- the present invention relates to an impingement cooling mechanism, a turbine blade, and a combustor.
- a turbine blade and a combustor being exposed to high-temperature environments, are sometimes provided with an impingement cooling mechanism for improving the cooling efficiency by raising the heat transfer coefficient.
- Patent Document 1 discloses an impingement cooling mechanism having a plurality of circular impingement holes that are formed in an opposing member that is arranged opposing a cooling target.
- Patent Document 1 U.S. Patent No. 5,100,293
- the flow rate of a crossflow that flows through the gap between the cooling target and the opposing member in which the impingement holes are formed increases as it heads downstream due to the addition of cooling gas that is supplied from the impingement holes to the gap.
- the present invention was achieved in view of the aforementioned circumstances, and has as its object to further raise the cooling efficiency by an impingement cooling mechanism.
- the present invention adopts the following constitution as a means for solving the aforementioned issues.
- the impingement cooling mechanism being provided with a cooling target and a plurality of impingement holes formed in an opposing member that is arranged opposing the cooling target, blows out cooling gas from the plurality of impingement holes toward the cooling target, having as the impingement hole at least one flat impingement hole of which the opening width in the flow direction of a crossflow in the gap between the cooling target and the opposing member is greater than the opening width in a direction orthogonal with the flow direction of the crossflow in the gap.
- the direction in which the opening width of the flat impingement hole becomes the maximum is parallel with the flow direction of a crossflow in the gap between the cooling target and the opposing member.
- the first or second aspect is provided with a turbulent flow forming member that is arranged exposed to a crossflow in the gap between the cooling target and the opposing member.
- the turbulent flow forming member is a protrusion or concavity that is arranged opposing the flat impingement hole and fixed to the cooling target.
- the impingement cooling mechanism of the fifth aspect of the present invention is a turbine blade having the impingement cooling mechanism that is any one of the first to fourth aspects.
- the impingement cooling mechanism of the sixth aspect of the present invention is a combustor having the impingement cooling mechanism that is any one of the first to fourth aspects.
- the present invention has as an impingement hole a flat impingement hole of which the opening width in the flow direction of a crossflow in the gap between the cooling target and the opposing member is set greater than the opening width in a direction orthogonal with the flow direction of the crossflow in the gap.
- FIG. 1A to FIG. 1C are schematic drawings showing outline configurations of an impingement cooling mechanism 1 of the present embodiment.
- FIG. 1A is a side cross-sectional view of the impingement cooling mechanism 1
- FIG. 1B is a plan view of the opposing wall
- FIG. 1C is an enlarged view of a flat impingement hole.
- the impingement cooling mechanism 1 has a plurality of the flat impingement holes 2 that are formed in an opposing wall 20 (opposing member) that is arranged opposing a cooling target 10.
- the impingement cooling mechanism 1 cools the cooling target 10 by blowing out cooling gas from the flat impingement holes 2 toward the cooling target 10.
- a plurality of the flat impingement holes 2 are provided evenly spaced in the opposing wall 20.
- each flat impingement hole 2 is set to a race track shape that is formed by two parallel sides and circular arcs that connect those sides.
- the flat impingement hole 2 is arranged so that the long axis thereof is parallel with the flow direction of a crossflow F in the gap between the cooling target 10 and the opposing wall 20. Thereby, the direction of the maximum opening width is made to be parallel with the crossflow F.
- the opening width D1 in the flow direction of the crossflow F is set to be greater than the opening width D2 in the direction that is orthogonal with the flow direction of the crossflow F.
- the size of this kind of flat impingement hole 2 is set so that the opening area is the same as the circular impingement hole 100 that has been conventionally used. As a result, as shown in FIG. 1C , the opening width D2 of the flat impingement hole 2 is narrower than the diameter Da of the conventional circular impingement hole 100.
- the ratio of the opening width D1 and the opening width D2 of the flat impingement hole 2 is set by manufacturing limits and the like.
- the opening width D1 becomes too wide, it will interfere with the flat impingement hole 2 that is adjacent in the flow direction of the crossflow F, and so the shape of the flat impingement hole 2 will no longer be maintainable. Accordingly, it is necessary to set the opening width D1 within a range that does not interfere with the flat impingement hole 2 that is adjacent in the flow direction of the crossflow F.
- the opening width D2 for making the same opening area as the conventionally used circular impingement hole 100 is unambiguously determined, whereby the ratio of the opening width D1 and the opening width D2 is determined.
- the impingement cooling mechanism 1 of the present embodiment having this kind of constitution has as an impingement hole the flat impingement hole 2 in which the opening width D1 in the flow direction of the crossflow F in the gap between the cooling target 10 and the opposing wall 20 is greater than the opening width D2 in the direction orthogonal with the flow direction of the crossflow F.
- the impingement cooling mechanism 1 of the present embodiment by blowing out the cooling gas from the flat impingement hole 2, the cooling gas is less prone to the influence of being bent by the crossflow F than the case of blowing out the cooling gas from the circular impingement hole. Therefore, the heat-transfer efficiency is increased, and so it becomes possible to improve the cooling efficiency.
- the constitution is adopted of all of the impingement holes being flat impingement holes 2.
- the influence of the crossflow F on the cooling gas is greater at the downstream where the flow rate of the crossflow F increases. For that reason, it is acceptable for only those at the downstream of the crossflow F to be flat impingement holes 2. In this situation, it is possible to reduce the number of flat impingement holes 2, whose processing cost is greater than circular impingement holes, and so it is possible to reduce the manufacturing cost of the impingement cooling mechanism 1.
- the constitution is described of the opening shape of the flat impingement hole 2 being a racetrack shape.
- the opening width in the flow direction of the crossflow F is set to be greater than the opening width in the direction that is orthogonal with the flow direction of the crossflow F
- the opening shape of the flat impingement hole in the present invention does not necessarily need to be a racetrack shape.
- a flat impingement hole 2A with an oval opening shape as shown in FIG. 2A it is possible to adopt a flat impingement hole 2B with a square opening shape as shown in FIG. 2B .
- a flat impingement hole 2C that is an isosceles triangle of which the distal end faces the downstream of the crossflow F as shown in FIG. 2C .
- a flat impingement hole 2D that is an isosceles triangle of which the distal end faces the upstream of the crossflow F as shown in FIG. 2D .
- a diamond-shaped flat impingement hole 2E as shown in FIG. 2E .
- FIG. 3A and FIG. 3B are schematic drawings showing outline configurations of an impingement cooling mechanism 1A of the present embodiment, with FIG. 3A being a side cross-sectional view of the impingement cooling mechanism 1A, and FIG. 3B being a plan view of the cooling target.
- the impingement cooling mechanism 1A is provided with a plurality of protrusions 3 (turbulent flow forming member) that are arranged exposed to the crossflow F.
- This protrusion 3 is arranged opposite to the flat impingement hole 2 and fixed to the cooling target 10, to form a turbulent flow in the gap between the cooling target 10 and the opposing wall 20.
- the impingement cooling mechanism 1 of the present embodiment that has this kind of constitution, a turbulent flow is formed in the gap between the cooling target 10 and the opposing wall 20 by the protrusion 3, the heat-transfer efficiency is increased, and so it is possible to improve the cooling efficiency.
- the constitution is adopted in which the turbulent flow forming member of the present invention is the protrusion 3 that is provided with respect to each flat impingement hole 2.
- the turbulent flow forming member of the present invention need only be capable of forming a turbulent flow in the gap between the cooling target 10 and the opposing wall 20.
- FIG. 4A and FIG. 4B it is also possible to use a dimple 3A that is provided with respect to each flat impingement hole 2 as the turbulent flow forming member of the present invention.
- a slot (concavity) 3B it is also possible to use a slot (concavity) 3B that extends in a direction orthogonal with the flow direction of the crossflow F as the turbulent flow forming member of the present invention.
- a protrusion 3C that extends in a direction orthogonal with the flow direction of the crossflow F as the turbulent flow forming member of the present invention.
- a simulation is performed to verify the effect of the impingement cooling mechanism 1 of the first embodiment mentioned above.
- this simulation uses an analytical model that provides a discharge hole on the downstream of the impingement holes in the array direction, and moreover has a flow passage for the main flow gas on the outer side region of the discharge hole.
- the analysis is performed for one having the impingement hole be a conventional impingement hole whose opening shape is circular (A-1), one having the impingement hole be a flat impingement hole in which the opening shape is a racetrack shape with the long axis thereof parallel to the crossflow (corresponding to the flat impingement hole 2 of the aforementioned first embodiment) (A-2), one having the impingement hole be a flat impingement hole in which the opening shape is a racetrack shape with the long axis thereof orthogonal with the crossflow (A-3), and one having the impingement hole be a flat impingement hole in which the opening shape is a racetrack shape with the long axis thereof intersecting the crossflow at 45° (A-4).
- FIG. 9 shows the result, in which A-2 is confirmed as being the most superior in terms of the average heat transfer coefficient. That is to say, it is confirmed that by using the flat impingement hole of the aforementioned first embodiment, it is possible to raise the heat transfer coefficient by more than a conventional circular impingement hole.
- an analysis is performed using an analytical model in which protrusions are added to the analytical model shown in FIG. 7A and FIG. 7B .
- the analysis is performed for one having the impingement holes all be flat impingement holes of which the opening shape is a racetrack shape, with the long axis thereof made parallel with the crossflow, and in which, as shown in FIG. 11 , the impingement holes viewed from the cooling gas injection direction are arranged between the protrusions (B-1), one in which the impingement holes are further removed from the protrusion array direction from the arrangement position of B-1 (B-2), and one in which the impingement holes, viewed from the cooling gas injection direction, are arranged overlapping with the protrusions (B-3).
- FIG. 12 shows the result, in which B-3 is confirmed as being the most superior in terms of the average heat transfer coefficient. That is to say, the one in which the flat impingement holes, viewed from the cooling gas injection direction, are arranged overlapping with the protrusions, in other words, the constitution in which the protrusions are arranged opposing the flat impingement holes, is preferred from the standpoint of the average heat transfer coefficient.
- FIG. 13A and FIG. 13B are schematic drawings that show a turbine blade 30 and a combustor 40 provided with the impingement cooling mechanism 1 of the first embodiment described above.
- FIG. 13A is a cross-sectional view of a turbine blade
- FIG. 13B is a cross-sectional view of a combustor.
- the turbine blade 30 has a double-shell structure that is provided with an outer wall 31 and an inner wall 32.
- the outer wall 31 corresponds to the aforementioned cooling target 10, while the inner wall 32 corresponds to the aforementioned opposing wall 20.
- the turbine blade 30 is provided with the impingement cooling mechanism 1 having flat impingement holes provided in the inner wall 32.
- the turbine blade 30 provided with this kind of impingement cooling mechanism 1 has excellent heat resistance.
- the combustor 40 has a double-shell structure that is provided with an inner liner 41 and an outer liner 42.
- the inner liner 41 corresponds to the cooling target 10 mentioned above.
- the combustor 40 is provided with the impingement cooling mechanism 1 having flat impingement holes provided in the outer liner 42, which corresponds to the aforementioned opposing wall 20.
- the impingement cooling mechanism 1 of the aforementioned first embodiment is capable of improving the cooling efficiency by increasing the heat transfer coefficient, the combustor 40 that is provided with this kind of impingement cooling mechanism 1 has excellent heat resistance.
- an impingement cooling mechanism that blows out cooling gas from a plurality of impingement holes formed in an opposing member arranged opposing a cooling target toward the cooling target, by blowing out the cooling gas from a flat impingement hole, it is possible to cause more of the cooling gas to reach the cooling target than the case of blowing out the cooling gas from a circular impingement hole. Thereby, it is possible to increase the heat-transfer efficiency and improve the cooling efficiency.
Abstract
Description
- The present invention relates to an impingement cooling mechanism, a turbine blade, and a combustor.
- Priority is claimed on Japanese Patent Application No.
2011-244727, filed November 8, 2011 - A turbine blade and a combustor, being exposed to high-temperature environments, are sometimes provided with an impingement cooling mechanism for improving the cooling efficiency by raising the heat transfer coefficient.
- For example,
Patent Document 1 discloses an impingement cooling mechanism having a plurality of circular impingement holes that are formed in an opposing member that is arranged opposing a cooling target. - [Patent Document 1]
U.S. Patent No. 5,100,293 - The flow rate of a crossflow that flows through the gap between the cooling target and the opposing member in which the impingement holes are formed increases as it heads downstream due to the addition of cooling gas that is supplied from the impingement holes to the gap.
- For this reason, at the downstream side of the crossflow that flows through the gap between the cooling target and the opposing member, the cooling gas that is blown out from the impingement holes ends up being swept into the crossflow before reaching the cooling target, and so raising the heat-transfer coefficient is difficult.
- The present invention was achieved in view of the aforementioned circumstances, and has as its object to further raise the cooling efficiency by an impingement cooling mechanism.
- The present invention adopts the following constitution as a means for solving the aforementioned issues.
- The impingement cooling mechanism according to the first aspect of the present invention, being provided with a cooling target and a plurality of impingement holes formed in an opposing member that is arranged opposing the cooling target, blows out cooling gas from the plurality of impingement holes toward the cooling target, having as the impingement hole at least one flat impingement hole of which the opening width in the flow direction of a crossflow in the gap between the cooling target and the opposing member is greater than the opening width in a direction orthogonal with the flow direction of the crossflow in the gap.
- According to the impingement cooling mechanism of the second aspect of the present invention, in the first aspect, the direction in which the opening width of the flat impingement hole becomes the maximum is parallel with the flow direction of a crossflow in the gap between the cooling target and the opposing member.
- According to the impingement cooling mechanism of the third aspect of the present invention, the first or second aspect is provided with a turbulent flow forming member that is arranged exposed to a crossflow in the gap between the cooling target and the opposing member.
- According to the impingement cooling mechanism of the fourth aspect of the present invention, in the third aspect, the turbulent flow forming member is a protrusion or concavity that is arranged opposing the flat impingement hole and fixed to the cooling target.
- The impingement cooling mechanism of the fifth aspect of the present invention is a turbine blade having the impingement cooling mechanism that is any one of the first to fourth aspects.
- The impingement cooling mechanism of the sixth aspect of the present invention is a combustor having the impingement cooling mechanism that is any one of the first to fourth aspects.
- The present invention has as an impingement hole a flat impingement hole of which the opening width in the flow direction of a crossflow in the gap between the cooling target and the opposing member is set greater than the opening width in a direction orthogonal with the flow direction of the crossflow in the gap.
- In this kind of flat impingement hole, since the opening width in the flow direction of the crossflow in the gap between the cooling target and the opposing member is large, it is possible to make the opening width when viewed from the flow direction of the crossflow smaller than a circular impingement hole that blows out cooling gas of the same flow rate. As a result, it is possible to make the collision region between the crossflow in the gap between the cooling target and the opposing member and the cooling gas flow that is blown out from the flat impingement hole narrower than the case of a circular impingement hole, and so it is possible to reduce the influence of the crossflow on the cooling gas flow.
- Accordingly, according to the present invention, by blowing out cooling gas from a flat impingement hole, it is possible to cause more of the cooling gas to reach the cooling target than the case of blowing out the cooling gas from a circular impingement hole.
- Therefore, according to the present invention, increasing the heat-transfer efficiency and improving the cooling efficiency become possible.
-
-
FIG. 1A is a schematic view that shows an outline configuration of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 1B is a schematic view that shows an outline configuration of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 1C is a schematic view that shows an outline configuration of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 2A is a plan view that shows a modification of the flat impingement hole provided in the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 2B is a plan view that shows a modification of the flat impingement hole provided in the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 2C is a plan view that shows a modification of the flat impingement hole provided in the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 2D is a plan view that shows a modification of the flat impingement hole provided in the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 2E is a plan view that shows a modification of the flat impingement hole provided in the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 3A is a schematic view that shows an outline configuration of the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 3B is a schematic view that shows an outline configuration of the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 4A is a schematic view that shows a modification of the turbulent flow forming member provided in the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 4B is a schematic view that shows a modification of the turbulent flow forming member provided in the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 5A is a schematic view that shows a modification of the turbulent flow forming member provided in the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 5B is a schematic view that shows a modification of the turbulent flow forming member provided in the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 6A is a schematic view that shows a modification of the turbulent flow forming member provided in the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 6B is a schematic view that shows a modification of the turbulent flow forming member provided in the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 7A is a conceptual view of the analytical model used in the simulation for verifying the effect of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 7B is a conceptual view of the analytical model used in the simulation for verifying the effect of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 8 is an explanatory drawing for explaining the patterns of the analytical model used in the simulation for verifying the effect of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 9 is a graph that shows the simulation result for verifying the effect of the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 10A is a conceptual view of the analytical model used in the simulation for verifying the effect of the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 10B is a conceptual view of the analytical model used in the simulation for verifying the effect of the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 11 is an explanatory drawing for explaining the patterns of the analytical model used in the simulation for verifying the effect of the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 12 is a graph that shows the simulation result for verifying the effect of the impingement cooling mechanism in the second embodiment of the present invention. -
FIG. 13A is a schematic view that shows a turbine blade provided with the impingement cooling mechanism in the first embodiment of the present invention. -
FIG. 13B is a schematic view that shows a combustor provided with the impingement cooling mechanism in the first embodiment of the present invention. - Hereinbelow, embodiments of an impingement cooling mechanism, a turbine blade, and a combustor according to the present invention shall be described, referring to the drawings. Note that in the drawings given below, the scale of each member is suitably altered in order to make each member a recognizable size.
-
FIG. 1A to FIG. 1C are schematic drawings showing outline configurations of animpingement cooling mechanism 1 of the present embodiment.FIG. 1A is a side cross-sectional view of theimpingement cooling mechanism 1,FIG. 1B is a plan view of the opposing wall, andFIG. 1C is an enlarged view of a flat impingement hole. - As shown in these drawings, the
impingement cooling mechanism 1 has a plurality of theflat impingement holes 2 that are formed in an opposing wall 20 (opposing member) that is arranged opposing acooling target 10. - The
impingement cooling mechanism 1 cools thecooling target 10 by blowing out cooling gas from theflat impingement holes 2 toward thecooling target 10. - As shown in
FIG. 1B , a plurality of theflat impingement holes 2 are provided evenly spaced in the opposingwall 20. - As shown in
FIG. 1C , the opening shape of eachflat impingement hole 2 is set to a race track shape that is formed by two parallel sides and circular arcs that connect those sides. - Also, as shown in
FIG. 1C , theflat impingement hole 2 is arranged so that the long axis thereof is parallel with the flow direction of a crossflow F in the gap between the coolingtarget 10 and the opposingwall 20. Thereby, the direction of the maximum opening width is made to be parallel with the crossflow F. - In the
flat impingement hole 2 that is arranged as described above, since the long axis is oriented in the flow direction of the crossflow F, and the short axis is oriented in the direction orthogonal with the flow direction of the crossflow F, the opening width D1 in the flow direction of the crossflow F is set to be greater than the opening width D2 in the direction that is orthogonal with the flow direction of the crossflow F. - The size of this kind of
flat impingement hole 2 is set so that the opening area is the same as thecircular impingement hole 100 that has been conventionally used. As a result, as shown inFIG. 1C , the opening width D2 of theflat impingement hole 2 is narrower than the diameter Da of the conventionalcircular impingement hole 100. - Note that the ratio of the opening width D1 and the opening width D2 of the
flat impingement hole 2 is set by manufacturing limits and the like. - For example, if the opening width D1 becomes too wide, it will interfere with the
flat impingement hole 2 that is adjacent in the flow direction of the crossflow F, and so the shape of theflat impingement hole 2 will no longer be maintainable.
Accordingly, it is necessary to set the opening width D1 within a range that does not interfere with theflat impingement hole 2 that is adjacent in the flow direction of the crossflow F. Once the opening width D1 is determined, the opening width D2 for making the same opening area as the conventionally usedcircular impingement hole 100 is unambiguously determined, whereby the ratio of the opening width D1 and the opening width D2 is determined. - Note that in the case of the
flat impingement hole 2 being arranged at a narrow pitch in the flow direction of the crossflow F so that the opening width D1 cannot be secured sufficiently wide, it is possible to secure the width of the opening width D1 by arranging theflat impingement holes 2 in a staggered shape. - The
impingement cooling mechanism 1 of the present embodiment having this kind of constitution has as an impingement hole theflat impingement hole 2 in which the opening width D1 in the flow direction of the crossflow F in the gap between the coolingtarget 10 and the opposingwall 20 is greater than the opening width D2 in the direction orthogonal with the flow direction of the crossflow F. - In this kind of
flat impingement hole 2, since the opening width D1 in the flow direction of the crossflow F is large, it is possible to make the opening width when viewed from the flow direction of the crossflow F smaller than a circular impingement hole that blows out cooling gas of the same flow rate. As a result, it is possible to make the collision region between the crossflow F and the cooling gas flow G that is blown out from theflat impingement hole 2 narrower than the case of a circular impingement hole, and so it is possible to reduce the influence of the crossflow F on the cooling gas flow G. - Accordingly, with the
impingement cooling mechanism 1 of the present embodiment, by blowing out the cooling gas from theflat impingement hole 2, the cooling gas is less prone to the influence of being bent by the crossflow F than the case of blowing out the cooling gas from the circular impingement hole. Therefore, the heat-transfer efficiency is increased, and so it becomes possible to improve the cooling efficiency. - Note that in the
impingement cooling mechanism 1 of the present embodiment, the constitution is adopted of all of the impingement holes being flat impingement holes 2. - However, it is not always necessary for all of the impingement holes to be flat impingement holes 2.
- For example, the influence of the crossflow F on the cooling gas is greater at the downstream where the flow rate of the crossflow F increases. For that reason, it is acceptable for only those at the downstream of the crossflow F to be flat impingement holes 2. In this situation, it is possible to reduce the number of flat impingement holes 2, whose processing cost is greater than circular impingement holes, and so it is possible to reduce the manufacturing cost of the
impingement cooling mechanism 1. - Also, in the
impingement cooling mechanism 1 of the present embodiment, the constitution is described of the opening shape of theflat impingement hole 2 being a racetrack shape. - However, provided the opening width in the flow direction of the crossflow F is set to be greater than the opening width in the direction that is orthogonal with the flow direction of the crossflow F, the opening shape of the flat impingement hole in the present invention does not necessarily need to be a racetrack shape.
- For example, it is possible to adopt a
flat impingement hole 2A with an oval opening shape as shown inFIG. 2A . Also, it is possible to adopt aflat impingement hole 2B with a square opening shape as shown inFIG. 2B . Also, it is possible to adopt a flat impingement hole 2C that is an isosceles triangle of which the distal end faces the downstream of the crossflow F as shown inFIG. 2C . Also, it is possible to adopt aflat impingement hole 2D that is an isosceles triangle of which the distal end faces the upstream of the crossflow F as shown inFIG. 2D . Also, it is possible to adopt a diamond-shapedflat impingement hole 2E as shown inFIG. 2E . - Next, a second embodiment of the impingement cooling mechanism of the present invention shall be described. Note that in the description of the present embodiment, descriptions of those portions that are the same as in the first embodiment of the impingement cooling mechanism described above shall be omitted or simplified.
-
FIG. 3A and FIG. 3B are schematic drawings showing outline configurations of animpingement cooling mechanism 1A of the present embodiment, withFIG. 3A being a side cross-sectional view of theimpingement cooling mechanism 1A, andFIG. 3B being a plan view of the cooling target. - As shown in these drawings, the
impingement cooling mechanism 1A is provided with a plurality of protrusions 3 (turbulent flow forming member) that are arranged exposed to the crossflow F. - This
protrusion 3 is arranged opposite to theflat impingement hole 2 and fixed to thecooling target 10, to form a turbulent flow in the gap between the coolingtarget 10 and the opposingwall 20. - According to the
impingement cooling mechanism 1 of the present embodiment that has this kind of constitution, a turbulent flow is formed in the gap between the coolingtarget 10 and the opposingwall 20 by theprotrusion 3, the heat-transfer efficiency is increased, and so it is possible to improve the cooling efficiency. - Note that in the
impingement cooling mechanism 1 of the present embodiment, the constitution is adopted in which the turbulent flow forming member of the present invention is theprotrusion 3 that is provided with respect to eachflat impingement hole 2. - However, the turbulent flow forming member of the present invention need only be capable of forming a turbulent flow in the gap between the cooling
target 10 and the opposingwall 20. - For example, as shown in
FIG. 4A and FIG. 4B , it is also possible to use adimple 3A that is provided with respect to eachflat impingement hole 2 as the turbulent flow forming member of the present invention. Also, as shown inFIG. 5A and FIG. 5B , it is also possible to use a slot (concavity) 3B that extends in a direction orthogonal with the flow direction of the crossflow F as the turbulent flow forming member of the present invention. Also, as shown inFIG. 6A and FIG. 6B , it is also possible to use aprotrusion 3C that extends in a direction orthogonal with the flow direction of the crossflow F as the turbulent flow forming member of the present invention. - A simulation is performed to verify the effect of the
impingement cooling mechanism 1 of the first embodiment mentioned above. - As shown in
FIG. 7A and FIG. 7B , this simulation uses an analytical model that provides a discharge hole on the downstream of the impingement holes in the array direction, and moreover has a flow passage for the main flow gas on the outer side region of the discharge hole. - Moreover, in this simulation, as shown in
FIG. 8 , the analysis is performed for one having the impingement hole be a conventional impingement hole whose opening shape is circular (A-1), one having the impingement hole be a flat impingement hole in which the opening shape is a racetrack shape with the long axis thereof parallel to the crossflow (corresponding to theflat impingement hole 2 of the aforementioned first embodiment) (A-2), one having the impingement hole be a flat impingement hole in which the opening shape is a racetrack shape with the long axis thereof orthogonal with the crossflow (A-3), and one having the impingement hole be a flat impingement hole in which the opening shape is a racetrack shape with the long axis thereof intersecting the crossflow at 45° (A-4). -
FIG. 9 shows the result, in which A-2 is confirmed as being the most superior in terms of the average heat transfer coefficient. That is to say, it is confirmed that by using the flat impingement hole of the aforementioned first embodiment, it is possible to raise the heat transfer coefficient by more than a conventional circular impingement hole. - Moreover, from the fact that A-2 is the most superior, it is found that the maximum opening width direction being made to be parallel with the flow direction of the crossflow contributed greatly to the improvement of the average heat transfer coefficient. Accordingly, from the standpoint of the average heat transfer coefficient, arranging the flat impingement hole so that its long axis is parallel with the flow direction of the crossflow is preferred.
- Next, a simulation is performed to verify the effect of the
impingement cooling mechanism 1A of the second embodiment described above. - As shown in
FIG. 10A and FIG. 10B , in the present simulation, an analysis is performed using an analytical model in which protrusions are added to the analytical model shown inFIG. 7A and FIG. 7B . - Also, in this simulation, the analysis is performed for one having the impingement holes all be flat impingement holes of which the opening shape is a racetrack shape, with the long axis thereof made parallel with the crossflow, and in which, as shown in
FIG. 11 , the impingement holes viewed from the cooling gas injection direction are arranged between the protrusions (B-1), one in which the impingement holes are further removed from the protrusion array direction from the arrangement position of B-1 (B-2), and one in which the impingement holes, viewed from the cooling gas injection direction, are arranged overlapping with the protrusions (B-3). -
FIG. 12 shows the result, in which B-3 is confirmed as being the most superior in terms of the average heat transfer coefficient. That is to say, the one in which the flat impingement holes, viewed from the cooling gas injection direction, are arranged overlapping with the protrusions, in other words, the constitution in which the protrusions are arranged opposing the flat impingement holes, is preferred from the standpoint of the average heat transfer coefficient. -
FIG. 13A and FIG. 13B are schematic drawings that show aturbine blade 30 and acombustor 40 provided with theimpingement cooling mechanism 1 of the first embodiment described above.FIG. 13A is a cross-sectional view of a turbine blade, andFIG. 13B is a cross-sectional view of a combustor. - As shown in
FIG. 13A , theturbine blade 30 has a double-shell structure that is provided with anouter wall 31 and aninner wall 32. Theouter wall 31 corresponds to theaforementioned cooling target 10, while theinner wall 32 corresponds to the aforementioned opposingwall 20. Theturbine blade 30 is provided with theimpingement cooling mechanism 1 having flat impingement holes provided in theinner wall 32. - According to the
impingement cooling mechanism 1 of the first embodiment, since it is possible to improve the cooling efficiency by increasing the heat transfer coefficient, theturbine blade 30 provided with this kind ofimpingement cooling mechanism 1 has excellent heat resistance. - As shown in
FIG. 13B , thecombustor 40 has a double-shell structure that is provided with aninner liner 41 and anouter liner 42. Theinner liner 41 corresponds to thecooling target 10 mentioned above. Thecombustor 40 is provided with theimpingement cooling mechanism 1 having flat impingement holes provided in theouter liner 42, which corresponds to the aforementioned opposingwall 20. - Since the
impingement cooling mechanism 1 of the aforementioned first embodiment is capable of improving the cooling efficiency by increasing the heat transfer coefficient, thecombustor 40 that is provided with this kind ofimpingement cooling mechanism 1 has excellent heat resistance. - Note that it is also possible to adopt constitutions of the
turbine blade 30 and thecombustor 40 being provided with theimpingement cooling mechanism 1 A of the aforementioned second embodiment instead of theimpingement cooling mechanism 1 of the aforementioned first embodiment. - Hereinabove, preferred embodiments of the present invention have been described with reference to the appended drawings, but it goes without saying that the present invention is not limited to the aforementioned embodiments. The various shapes and combinations of each constituent member shown in the embodiments refer to only a single example, and may be altered in various ways based on design requirements and so forth within a scope that does not deviate from the subject matter of the present invention.
- In an impingement cooling mechanism that blows out cooling gas from a plurality of impingement holes formed in an opposing member arranged opposing a cooling target toward the cooling target, by blowing out the cooling gas from a flat impingement hole, it is possible to cause more of the cooling gas to reach the cooling target than the case of blowing out the cooling gas from a circular impingement hole. Thereby, it is possible to increase the heat-transfer efficiency and improve the cooling efficiency.
-
- 1, 1A: Impingement cooling mechanism
- 2, 2A, 2B, 2C, 2D, 2E: Flat impingement hole
- 3: Protrusion (turbulent flow forming member)
- 3A: Dimple (turbulent flow forming member)
- 3B: Slot (turbulent flow forming member)
- 3C: Protrusion (turbulent flow forming member)
- 10: Cooling target
- 20: Opposing wall (opposing member)
- D1: Opening width in crossflow direction
- D2: Opening width in direction orthogonal with crossflow direction
- F: Crossflow
- 30: Turbine blade
- 31: Outer wall
- 32: Inner wall
- 40: Combustor
- 41: Inner liner
- 42: Outer liner
Claims (6)
- An impingement cooling mechanism comprising:a cooling target;an opposing member that is arranged opposing the cooling target; anda plurality of impingement holes formed in the opposing member,that blows out cooling gas from the plurality of impingement holes toward the cooling target;wherein the impingement cooling mechanism has as the impingement hole at least one flat impingement hole of which the opening width in the flow direction of a crossflow in the gap between the cooling target and the opposing member is greater than the opening width in a direction orthogonal with the flow direction of the crossflow in the gap.
- The impingement cooling mechanism according to claim 1, wherein the direction in which the opening width of the flat impingement hole becomes the maximum is parallel with the flow direction of a crossflow in the gap between the cooling target and the opposing member.
- The impingement cooling mechanism according to claim 1 or 2, further comprising a turbulent flow forming member that is arranged exposed to a crossflow in the gap between the cooling target and the opposing member.
- The impingement cooling mechanism according to claim 3, wherein the turbulent flow forming member is a protrusion or concavity that is arranged opposing the flat impingement hole and fixed to the cooling target.
- A turbine blade comprising the impingement cooling mechanism according to any one of claims 1 to 4.
- A combustor comprising the impingement cooling mechanism according to any one of claims 1 to 4.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011244727A JP2013100765A (en) | 2011-11-08 | 2011-11-08 | Impingement cooling mechanism, turbine blade, and combustor |
PCT/JP2012/078867 WO2013069694A1 (en) | 2011-11-08 | 2012-11-07 | Impingement cooling mechanism, turbine blade, and combustor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2778369A1 true EP2778369A1 (en) | 2014-09-17 |
EP2778369A4 EP2778369A4 (en) | 2015-07-22 |
Family
ID=48290068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12847634.8A Withdrawn EP2778369A4 (en) | 2011-11-08 | 2012-11-07 | Impingement cooling mechanism, turbine blade, and combustor |
Country Status (4)
Country | Link |
---|---|
US (1) | US20140238028A1 (en) |
EP (1) | EP2778369A4 (en) |
JP (1) | JP2013100765A (en) |
WO (1) | WO2013069694A1 (en) |
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EP2792850A4 (en) * | 2011-12-15 | 2015-10-28 | Ihi Corp | Impingement cooling mechanism, turbine blade and combustor |
WO2016099662A3 (en) * | 2014-10-31 | 2016-07-21 | General Electric Company | Impingement cooled turbine engine component |
WO2017006045A1 (en) * | 2015-07-06 | 2017-01-12 | Safran Aircraft Engines | Assembly for turbine |
EP3124744A1 (en) * | 2015-07-29 | 2017-02-01 | Siemens Aktiengesellschaft | Vane with impingement cooled platform |
US9957816B2 (en) | 2014-05-29 | 2018-05-01 | General Electric Company | Angled impingement insert |
US10422235B2 (en) | 2014-05-29 | 2019-09-24 | General Electric Company | Angled impingement inserts with cooling features |
US10690055B2 (en) | 2014-05-29 | 2020-06-23 | General Electric Company | Engine components with impingement cooling features |
WO2021058156A1 (en) * | 2019-09-25 | 2021-04-01 | Siemens Energy Global GmbH & Co. KG | Component with a region to be cooled and means for the additive manufacture of same |
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JP5927893B2 (en) * | 2011-12-15 | 2016-06-01 | 株式会社Ihi | Impinge cooling mechanism, turbine blade and combustor |
WO2015057272A1 (en) * | 2013-10-18 | 2015-04-23 | United Technologies Corporation | Combustor wall having cooling element(s) within a cooling cavity |
US10598382B2 (en) | 2014-11-07 | 2020-03-24 | United Technologies Corporation | Impingement film-cooled floatwall with backside feature |
US10738700B2 (en) | 2016-11-16 | 2020-08-11 | General Electric Company | Turbine assembly |
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KR102080566B1 (en) * | 2018-01-03 | 2020-02-24 | 두산중공업 주식회사 | Cooling structure of combustor, combustor and gas turbine having the same |
KR102080567B1 (en) * | 2018-01-03 | 2020-02-24 | 두산중공업 주식회사 | Cooling structure of combustor, combustor and gas turbine having the same |
US20190277501A1 (en) * | 2018-03-07 | 2019-09-12 | United Technologies Corporation | Slot arrangements for an impingement floatwall film cooling of a turbine engine |
US11959641B2 (en) * | 2020-01-31 | 2024-04-16 | Rtx Corporation | Combustor shell with shaped impingement holes |
KR102502652B1 (en) * | 2020-10-23 | 2023-02-21 | 두산에너빌리티 주식회사 | Array impingement jet cooling structure with wavy channel |
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EP2792850A4 (en) * | 2011-12-15 | 2015-10-28 | Ihi Corp | Impingement cooling mechanism, turbine blade and combustor |
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US9957816B2 (en) | 2014-05-29 | 2018-05-01 | General Electric Company | Angled impingement insert |
US10422235B2 (en) | 2014-05-29 | 2019-09-24 | General Electric Company | Angled impingement inserts with cooling features |
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CN107709709B (en) * | 2015-07-06 | 2020-11-10 | 赛峰航空器发动机 | Assembly for a turbomachine |
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EP3124744A1 (en) * | 2015-07-29 | 2017-02-01 | Siemens Aktiengesellschaft | Vane with impingement cooled platform |
WO2021058156A1 (en) * | 2019-09-25 | 2021-04-01 | Siemens Energy Global GmbH & Co. KG | Component with a region to be cooled and means for the additive manufacture of same |
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Also Published As
Publication number | Publication date |
---|---|
WO2013069694A1 (en) | 2013-05-16 |
EP2778369A4 (en) | 2015-07-22 |
US20140238028A1 (en) | 2014-08-28 |
JP2013100765A (en) | 2013-05-23 |
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