US20150345426A1 - Geared turbofan gas turbine engine architecture - Google Patents
Geared turbofan gas turbine engine architecture Download PDFInfo
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- US20150345426A1 US20150345426A1 US14/662,387 US201514662387A US2015345426A1 US 20150345426 A1 US20150345426 A1 US 20150345426A1 US 201514662387 A US201514662387 A US 201514662387A US 2015345426 A1 US2015345426 A1 US 2015345426A1
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- turbine
- fan
- engine
- fan drive
- drive turbine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
- F02K3/06—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type with front fan
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/025—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the by-pass flow being at least partly used to create an independent thrust component
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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
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/162—Bearing supports
- F01D25/164—Flexible supports; Vibration damping means associated with the bearing
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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
- F01D5/02—Blade-carrying members, e.g. rotors
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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
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
- F02C3/107—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor with two or more rotors connected by power transmission
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/36—Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/16—Control of working fluid flow
- F02C9/18—Control of working fluid flow by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
- F02K3/072—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type with counter-rotating, e.g. fan rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
- F02K3/075—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type controlling flow ratio between flows
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/009—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by bleeding, by passing or recycling fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
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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
- F05D2210/00—Working fluids
- F05D2210/10—Kind or type
- F05D2210/12—Kind or type gaseous, i.e. compressible
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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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/32—Application in turbines in gas turbines
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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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/32—Application in turbines in gas turbines
- F05D2220/323—Application in turbines in gas turbines for aircraft propulsion, e.g. jet engines
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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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/36—Application in turbines specially adapted for the fan of turbofan engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/24—Rotors for turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/35—Combustors or associated equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/40—Use of a multiplicity of similar components
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- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
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- F05D2250/00—Geometry
- F05D2250/30—Arrangement of components
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- 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
- F05D2260/40—Transmission of power
- F05D2260/402—Transmission of power through friction drives
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- 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
- F05D2260/40—Transmission of power
- F05D2260/403—Transmission of power through the shape of the drive components
- F05D2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
- F05D2260/40311—Transmission of power through the shape of the drive components as in toothed gearing of the epicyclical, planetary or differential type
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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
- F05D2260/96—Preventing, counteracting or reducing vibration or noise
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- a gas turbine engine typically includes a fan section, a compressor section, a combustor section and a turbine section. Air entering the compressor section is compressed and delivered into the combustion section where it is mixed with fuel and ignited to generate a high-speed exhaust gas flow. The high-speed exhaust gas flow expands through the turbine section to drive the compressor and the fan section.
- the compressor section typically includes low and high pressure compressors, and the turbine section includes low and high pressure turbines.
- the high pressure turbine drives the high pressure compressor through an outer shaft to form a high spool
- the low pressure turbine drives the low pressure compressor through an inner shaft to form a low spool.
- the inner shaft may also drive the fan section.
- a direct drive gas turbine engine includes a fan section driven by the inner shaft such that the low pressure compressor, low pressure turbine and fan section rotate at a common speed in a common direction.
- a speed reduction device such as an epicyclical gear assembly may be utilized to drive the fan section such that the fan section may rotate at a speed different than the turbine section so as to increase the overall propulsive efficiency of the engine.
- a shaft driven by one of the turbine sections provides an input to the epicyclical gear assembly that drives the fan section at a speed different than the turbine section such that both the turbine section and the fan section can rotate at closer to optimal speeds.
- a gas turbine engine includes a fan rotatable about an axis, a compressor section, a combustor in fluid communication with the compressor section, and a turbine section in fluid communication with the combustor.
- the turbine section includes a fan drive turbine and a second turbine.
- the second turbine is disposed forward of the fan drive turbine.
- the fan drive turbine includes at least one rotor having a bore radius (R) and a live rim radius (r). A ratio of r/R is between about 2.00 and about 2.30.
- a speed change system is driven by the fan drive turbine for rotating the fan about the axis.
- the bore radius (R) includes at least one bore width (W) in a direction parallel to the axis of rotation.
- a ratio of the bore width (W) to the live rim radius (r) is between about 4.65 and about 5.55.
- the bore radius (R) includes at least one bore width (W) in a direction parallel to the axis of rotation.
- the bore width (W) is between about 1.20 inches and about 2.00 inches where the bore width (W) is an unattached disk bore.
- the fan drive turbine section has a first exit area and rotates at a first speed.
- the second turbine section has a second exit area and rotates at a second speed, which is faster than the first speed.
- a first performance quantity is defined as the product of the first speed squared and the first area.
- a second performance quantity is defined as the product of the second speed squared and the second area.
- a performance ratio of the first performance quantity to the second performance quantity is between about 0.5 and about 1.5.
- the performance ratio is above or equal to about 0.8.
- the first performance quantity is above or equal to about 4.
- the speed change system includes a gearbox.
- the fan and the fan drive turbine both rotate in a first direction about the axis.
- the second turbine section rotates in a second direction opposite the first direction.
- the speed change system includes a gearbox.
- the fan, the fan drive turbine, and the second turbine section all rotate in a first direction about the axis.
- the speed change system comprises a gearbox.
- the fan and the second turbine both rotate in a first direction about the axis.
- the fan drive turbine rotates in a second direction opposite the first direction.
- the speed change system includes a gearbox.
- the fan is rotatable in a first direction and the fan drive turbine, and the second turbine section rotate in a second direction opposite the first direction about the axis.
- the speed change system includes a gear reduction having a gear ratio greater than about 2.3.
- the fan delivers a portion of air into a bypass duct, and a bypass ratio being defined as the portion of air delivered into the bypass duct divided by the amount of air delivered into the compressor section, with the bypass ratio being greater than about 6.0.
- the bypass ratio is greater than about 10.0.
- a fan pressure ratio across the fan is less than about 1.5.
- the fan has about 26 or fewer blades.
- the fan drive turbine section has at least 3 stages and up to 6 stages.
- a ratio between the number of fan blades and the number of fan drive turbine stages is between about 2.5 and about 8.5.
- a pressure ratio across the fan drive turbine is greater than about 5:1.
- any of the foregoing engines includes a power density greater than about 1.5 lbf/in 3 and less than or equal to about 5.5 lbf/in 3 .
- the second turbine includes at least two stages and performs at a first pressure ratio.
- the fan drive turbine includes more than two stages and performs at a second pressure ratio less than the first pressure ratio.
- a gas turbine engine includes a fan rotatable about an axis, a compressor section, a combustor in fluid communication with the compressor section, and a turbine section in fluid communication with the combustor.
- the turbine section includes a fan drive turbine and a second turbine.
- the second turbine is disposed forward of the fan drive turbine.
- the fan drive turbine includes at least one rotor having a live rim radius (r), and a bore width (W) in a direction parallel to the axis of rotation.
- a ratio of the bore width (W) to the live rim radius (r) is between about 4.65 and about 5.55.
- a speed change system is driven by the fan drive turbine for rotating the fan about the axis.
- the bore width (W) is between about 1.20 inches and about 2.00 inches where the bore width (W) is an unattached disk bore.
- the rotor has a bore radius (R).
- a ratio of the live rim radius (r) and the bore radius (R) is between about 2.00 and about 2.30.
- the speed change system includes a gearbox and the fan and the fan drive turbine both rotate in a first direction about the axis.
- the second turbine section rotates in a second direction opposite the first direction.
- the speed change system includes a gearbox.
- the fan, the fan drive turbine, and the second turbine section all rotate in a first direction about the axis.
- the speed change system includes a gearbox.
- the fan and the second turbine both rotate in a first direction about the axis.
- the fan drive turbine rotates in a second direction opposite the first direction.
- the speed change system includes a gearbox.
- the fan is rotatable in a first direction and the fan drive turbine, and the second turbine section rotate in a second direction opposite the first direction about the axis.
- the fan drive turbine is one of three turbine rotors including the fan drive turbine driving the fan, the second turbine that drives a compressor rotor and one other turbine driving another compressor rotor of the compressor section.
- the speed change system is positioned intermediate the fan drive turbine and a compressor driven by the fan drive turbine.
- FIG. 1 is a schematic view of an example gas turbine engine.
- FIG. 2 is a schematic view indicating relative rotation between sections of an example gas turbine engine.
- FIG. 3 is another schematic view indicating relative rotation between sections of an example gas turbine engine.
- FIG. 4 is another schematic view indicating relative rotation between sections of an example gas turbine engine.
- FIG. 5 is another a schematic view indicating relative rotation between sections of an example gas turbine engine.
- FIG. 6 is a schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine.
- FIG. 7 is another schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine.
- FIG. 8A is another schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine.
- FIG. 8B is an enlarged view of the example bearing configuration shown in FIG. 8A .
- FIG. 9 is another schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine.
- FIG. 10 is a schematic view of an example compact turbine section.
- FIG. 11 is a schematic cross-section of example stages for the disclosed example gas turbine engine.
- FIG. 12 is a schematic view an example turbine rotor perpendicular to the axis or rotation.
- FIG. 13 is another embodiment of an example gas turbine engine for use with the present invention.
- FIG. 14 is yet another embodiment of an example gas turbine engine for use with the present invention.
- FIG. 1 schematically illustrates an example gas turbine engine 20 that includes a fan section 22 , a compressor section 24 , a combustor section 26 and a turbine section 28 .
- Alternative engines might include an augmenter section (not shown) among other systems or features.
- the fan section 22 drives air along a bypass flow path B while the compressor section 24 draws air in along a core flow path C where air is compressed and communicated to a combustor section 26 .
- the combustor section 26 air is mixed with fuel and ignited to generate a high pressure exhaust gas stream that expands through the turbine section 28 where energy is extracted and utilized to drive the fan section 22 and the compressor section 24 .
- turbofan gas turbine engine depicts a turbofan gas turbine engine
- the concepts described herein are not limited to use with turbofans as the teachings may be applied to other types of turbine engines; for example a turbine engine including a three-spool architecture in which three spools concentrically rotate about a common axis such that a low spool enables a low pressure turbine to drive a fan via a gearbox, an intermediate spool enables an intermediate pressure turbine to drive a first compressor of the compressor section, and a high spool enables a high pressure turbine to drive a high pressure compressor of the compressor section.
- the example engine 20 generally includes a low speed spool 30 and a high speed spool 32 mounted for rotation about an engine central longitudinal axis A relative to an engine static structure 36 via several bearing systems 38 . It should be understood that various bearing systems 38 at various locations may alternatively or additionally be provided.
- the low speed spool 30 generally includes an inner shaft 40 that connects a fan 42 and a low pressure (or first) compressor section 44 to a low pressure (or first) turbine section 46 .
- the inner shaft 40 drives the fan 42 through a speed change device, such as a geared architecture 48 , to drive the fan 42 at a lower speed than the low speed spool 30 .
- the high-speed spool 32 includes an outer shaft 50 that interconnects a high pressure (or second) compressor section 52 and a high pressure (or second) turbine section 54 .
- the inner shaft 40 and the outer shaft 50 are concentric and rotate via the bearing systems 38 about the engine central longitudinal axis A.
- a combustor 56 is arranged between the high pressure compressor 52 and the high pressure turbine 54 .
- the high pressure turbine 54 includes at least two stages to provide a double stage high pressure turbine 54 .
- the high pressure turbine 54 includes only a single stage.
- a “high pressure” compressor or turbine experiences a higher pressure than a corresponding “low pressure” compressor or turbine.
- the example low pressure turbine 46 has a pressure ratio that is greater than about 5.
- the pressure ratio of the example low pressure turbine 46 is measured prior to an inlet of the low pressure turbine 46 as related to the pressure measured at the outlet of the low pressure turbine 46 prior to an exhaust nozzle.
- a mid-turbine frame 58 of the engine static structure 36 is arranged generally between the high pressure turbine 54 and the low pressure turbine 46 .
- the mid-turbine frame 58 further supports bearing systems 38 in the turbine section 28 as well as setting airflow entering the low pressure turbine 46 .
- the core airflow C is compressed by the low pressure compressor 44 then by the high pressure compressor 52 mixed with fuel and ignited in the combustor 56 to produce high speed exhaust gases that are then expanded through the high pressure turbine 54 and low pressure turbine 46 .
- the mid-turbine frame 58 includes vanes 60 , which are in the core airflow path and function as an inlet guide vane for the low pressure turbine 46 . Utilizing the vane 60 of the mid-turbine frame 58 as the inlet guide vane for low pressure turbine 46 decreases the length of the low pressure turbine 46 without increasing the axial length of the mid-turbine frame 58 . Reducing or eliminating the number of vanes in the low pressure turbine 46 shortens the axial length of the turbine section 28 . Thus, the compactness of the gas turbine engine 20 is increased and a higher power density may be achieved.
- the disclosed gas turbine engine 20 in one example is a high-bypass geared aircraft engine.
- the gas turbine engine 20 includes a bypass ratio greater than about six (6), with an example embodiment being greater than about ten (10).
- the example geared architecture 48 is an epicyclical gear train, such as a planetary gear system, star gear system or other known gear system, with a gear reduction ratio of greater than about 2.3.
- the gas turbine engine 20 includes a bypass ratio greater than about ten (10:1) and the fan diameter is significantly larger than an outer diameter of the low pressure compressor 44 . It should be understood, however, that the above parameters are only exemplary of one embodiment of a gas turbine engine including a geared architecture and that the present disclosure is applicable to other gas turbine engines.
- the fan section 22 of the engine 20 is designed for a particular flight condition—typically cruise at about 0.8 Mach and about 35,000 feet.
- TFCT Thrust Specific Fuel Consumption
- Low fan pressure ratio is the pressure ratio across the fan blade alone, without a Fan Exit Guide Vane (“FEGV”) system.
- the low fan pressure ratio as disclosed herein according to one non-limiting embodiment is less than about 1.50. In another non-limiting embodiment the low fan pressure ratio is less than about 1.45.
- Low corrected fan tip speed is the actual fan tip speed in ft/sec divided by an industry standard temperature correction of [(Tram ° R)/(518.7° R)] 0.5 .
- the “Low corrected fan tip speed”, as disclosed herein according to one non-limiting embodiment, is less than about 1150 ft/second.
- the example gas turbine engine includes the fan 42 that comprises in one non-limiting embodiment less than about 26 fan blades. In another non-limiting embodiment, the fan section 22 includes less than about 18 fan blades. Moreover, in one disclosed embodiment the low pressure turbine 46 includes no more than about 6 turbine stages schematically indicated at 34 . In another non-limiting example embodiment the low pressure turbine 46 includes about 3 or more turbine stages. A ratio between the number of fan blades 42 and the number of low pressure turbine stages is between about 2.5 and about 8.5. The example low pressure turbine 46 provides the driving power to rotate the fan section 22 and therefore the relationship between the number of turbine stages 34 in the low pressure turbine 46 and the number of blades 42 in the fan section 22 disclose an example gas turbine engine 20 with increased power transfer efficiency.
- Increased power transfer efficiency is provided due in part to the increased use of improved turbine blade materials and manufacturing methods such as directionally solidified castings, and single crystal materials that enable increased turbine speed and a reduced number of stages.
- the example low pressure turbine 46 includes improved turbine disks configurations that further enable desired durability at the higher turbine speeds.
- an example disclosed speed change device is an epicyclical gearbox of a planet type, where the input is to the center “sun” gear 62 .
- Planet gears 64 (only one shown) around the sun gear 62 rotate and are spaced apart by a carrier 68 that rotates in a direction common to the sun gear 62 .
- a ring gear 66 which is non-rotatably fixed to the engine static casing 36 (shown in FIG. 1 ), contains the entire gear assembly.
- the fan 42 is attached to and driven by the carrier 68 such that the direction of rotation of the fan 42 is the same as the direction of rotation of the carrier 68 that, in turn, is the same as the direction of rotation of the input sun gear 62 .
- fan drive turbine is utilized to indicate the turbine that provides the driving power for rotating the blades 42 of the fan section 22 .
- second turbine is utilized to indicate the turbine before the fan drive turbine that is not utilized to drive the fan 42 .
- the fan drive turbine is the low pressure turbine 46
- the second turbine is the high pressure turbine 54 .
- a three spool engine configuration may include an intermediate turbine (not shown) utilized to drive the fan section 22 and is within the contemplation of this disclosure.
- the fan drive turbine is the low pressure turbine 46 and therefore the fan section 22 and low pressure turbine 46 rotate in a common direction as indicated by the common “+” sign indicating rotation of both the fan 42 and the low pressure turbine 46 .
- the high pressure turbine 54 or second turbine rotates in a direction common with the fan drive turbine 46 .
- the high pressure turbine 54 or second turbine rotates in a direction opposite the fan drive turbine (low pressure turbine 46 ) and the fan 42 .
- another example disclosed speed change device is an epicyclical gearbox referred to as a star type gearbox, where the input is to the center “sun” gear 62 .
- Star gears 65 (only one shown) around the sun gear 62 rotate in a fixed position around the sun gear and are spaced apart by a carrier 68 that is fixed to a static casing 36 (best shown in FIG. 1 ).
- a ring gear 66 that is free to rotate contains the entire gear assembly.
- the fan 42 is attached to and driven by the ring gear 66 such that the direction of rotation of the fan 42 is opposite the direction of rotation of the input sun gear 62 . Accordingly, the low pressure compressor 44 and the low pressure turbine 46 rotate in a direction opposite rotation of the fan 42 .
- the fan drive turbine is the low pressure turbine 46 and therefore the fan 42 rotates in a direction opposite that of the low pressure turbine 46 and the low pressure compressor 44 .
- the high spool 32 including the high pressure turbine 54 and the high pressure compressor 52 rotate in a direction counter to the fan 42 and common with the low spool 30 including the low pressure compressor 44 and the fan drive turbine 46 .
- the high pressure or second turbine 54 rotates in a direction common with the fan 42 and counter to the low spool 30 including the low pressure compressor 44 and the fan drive turbine 46 .
- the bearing assemblies near the forward end of the shafts in the engine at locations 70 and 72 which bearings support rotation of the inner shaft 40 and the outer shaft 50 , counter net thrust forces in a direction parallel to the axis A that are generated by the rearward load of low pressure turbine 46 and the high pressure turbine 54 , minus the high pressure compressor 52 and the low pressure compressor 44 , which also contribute to the thrust forces acting on the corresponding low spool 30 and the high spool 32 .
- a first forward bearing assembly 70 is supported on a portion of the static structure schematically shown at 36 and supports a forward end of the inner shaft 40 .
- the example first forward bearing assembly 70 is a thrust bearing and controls movement of the inner shaft 40 and thereby the low spool 30 in an axial direction.
- a second forward bearing assembly 72 is supported by the static structure 36 to support rotation of the high spool 32 and substantially prevent movement along in an axial direction of the outer shaft 50 .
- the first forward bearing assembly 70 is mounted to support the inner shaft 40 at a point forward of a connection 88 of a low pressure compressor rotor 90 .
- the second forward bearing assembly 72 is mounted forward of a connection referred to as a hub 92 between a high pressure compressor rotor 94 and the outer shaft 50 .
- a first aft bearing assembly 74 supports the aft portion of the inner shaft 40 .
- the first aft bearing assembly 74 is a roller bearing and supports rotation, but does not provide resistance to movement of the shaft 40 in the axial direction. Instead, the aft bearing 74 allows the shaft 40 to expand thermally between its location and the bearing 72 .
- the example first aft bearing assembly 74 is disposed aft of a connection hub 80 between a low pressure turbine rotor 78 and the inner shaft 40 .
- a second aft bearing assembly 76 supports the aft portion of the outer shaft 50 .
- the example second aft bearing assembly 76 is a roller bearing and is supported by a corresponding static structure 36 through the mid turbine frame 58 which transfers the radial load of the shaft across the turbine flow path to ground 36 .
- the second aft bearing assembly 76 supports the outer shaft 50 and thereby the high spool 32 at a point aft of a connection hub 84 between a high pressure turbine rotor 82 and the outer shaft 50 .
- first and second forward bearing assemblies 70 , 72 and the first and second aft bearing assemblies 74 , 76 are supported to the outside of either the corresponding compressor or turbine connection hubs 80 , 88 to provide a straddle support configuration of the corresponding inner shaft 40 and outer shaft 50 .
- the straddle support of the inner shaft 40 and the outer shaft 50 provide a support and stiffness desired for operation of the gas turbine engine 20 .
- another example shaft support configuration includes the first and second forward bearing assemblies 70 , 72 disposed to support the forward portion of the corresponding inner shaft 40 and outer shaft 50 .
- the first aft bearing 74 is disposed aft of the connection 80 between the rotor 78 and the inner shaft 40 .
- the first aft bearing 74 is a roller bearing and supports the inner shaft 40 in a straddle configuration.
- the straddle configuration can require additional length of the inner shaft 40 and therefore an alternate configuration referred to as an overhung configuration can be utilized.
- the outer shaft 50 is supported by the second aft bearing assembly 76 that is disposed forward of the connection 84 between the high pressure turbine rotor 82 and the outer shaft 50 .
- connection hub 84 of the high pressure turbine rotor 82 to the outer shaft 50 is overhung aft of the bearing assembly 76 .
- This positioning of the second aft bearing 76 in an overhung orientation potentially provides for a reduced length of the outer shaft 50 .
- the positioning of the aft bearing 76 may also eliminate the need for other support structures such as the mid turbine frame 58 as both the high pressure turbine 54 is supported at the bearing assembly 76 and the low pressure turbine 46 is supported by the bearing assembly 74 .
- the mid turbine frame strut 58 can provide an optional roller bearing 74 A which can be added to reduce vibratory modes of the inner shaft 40 .
- another example shaft support configuration includes the first and second forward bearing assemblies 70 , 72 disposed to support corresponding forward portions of each of the inner shaft 40 and the outer shaft 50 .
- the first aft bearing 74 provides support of the outer shaft 40 at a location aft of the connection 80 in a straddle mount configuration.
- the aft portion of the outer shaft 50 is supported by a roller bearing assembly 86 supported within a space 96 defined between an outer surface of the inner shaft 40 and an inner surface of the outer shaft 50 .
- the roller bearing assembly 86 supports the aft portion of the outer shaft 50 on the inner shaft 40 .
- the use of the roller bearing assembly 86 to support the outer shaft 50 eliminates the requirements for support structures that lead back to the static structure 36 through the mid turbine frame 58 .
- the example bearing assembly 86 can provide both a reduced shaft length, and support of the outer shaft 50 at a position substantially in axial alignment with the connection hub 84 for the high pressure turbine rotor 82 and the outer shaft 50 .
- the bearing assembly 86 is positioned aft of the hub 82 and is supported through the rearmost section of shaft 50 . Referring to FIG.
- another example shaft support configuration includes the first and second forward bearing assemblies 70 , 72 disposed to support corresponding forward portions of each of the inner shaft 40 and the outer shaft 50 .
- the first aft bearing assembly 74 is supported at a point along the inner shaft 40 forward of the connection 80 between the low pressure turbine rotor 78 and the inner shaft 40 .
- Positioning of the first aft bearing 74 forward of the connection 80 can be utilized to reduce the overall length of the engine 20 . Moreover, positioning of the first aft bearing assembly 74 forward of the connection 80 provides for support through the mid turbine frame 58 to the static structure 36 . Furthermore, in this example the second aft bearing assembly 76 is deployed in a straddle mount configuration aft of the connection 84 between the outer shaft 50 and the rotor 82 . Accordingly, in this example, both the first and second aft bearing assemblies 74 , 76 share a common support structure to the static outer structure 36 . As appreciated, such a common support feature provides for a less complex engine construction along with reducing the overall length of the engine. Moreover, the reduction or required support structures will reduce overall weight to provide a further improvement in aircraft fuel burn efficiency.
- a portion of the example turbine section 28 is shown and includes the low pressure turbine 46 and the high pressure turbine 54 with the mid turbine frame 58 disposed between an outlet of the high pressure turbine and the low pressure turbine.
- the mid turbine frame 58 and vane 60 are positioned to be upstream of the first stage 98 of the low pressure turbine 46 . While a single vane 60 is illustrated, it should be understood these would be plural vanes 60 spaced circumferentially.
- the vane 60 redirects the flow downstream of the high pressure turbine 54 as it approaches the first stage 98 of the low pressure turbine 46 .
- vane 60 may be an actual airfoil with camber and turning, that aligns the airflow as desired into the low pressure turbine 46 .
- the overall length and volume of the combined turbine sections 46 , 54 is reduced because the vane 60 serves several functions including streamlining the mid turbine frame 58 , protecting any static structure and any oil tubes servicing a bearing assembly from exposure to heat, and turning the flow entering the low pressure turbine 46 such that it enters the rotating airfoil 100 at a desired flow angle. Further, by incorporating these features together, the overall assembly and arrangement of the turbine section 28 is reduced in volume.
- the materials for forming the low pressure turbine 46 can be improved to provide for a reduced volume.
- Such materials may include, for example, materials with increased thermal and mechanical capabilities to accommodate potentially increased stresses induced by operating the low pressure turbine 46 at the increased speed.
- the elevated speeds and increased operating temperatures at the entrance to the low pressure turbine 46 enables the low pressure turbine 46 to transfer a greater amount of energy, more efficiently to drive both a larger diameter fan 42 through the geared architecture 48 and an increase in compressor work performed by the low pressure compressor 44 .
- a first rotating blade 100 of the low pressure turbine 46 can be a directionally solidified casting blade, a single crystal casting blade or a hollow, internally cooled blade.
- the improved material and thermal properties of the example turbine blade material provide for operation at increased temperatures and speeds, that in turn provide increased efficiencies at each stage that thereby provide for use of a reduced number of low pressure turbine stages.
- the reduced number of low pressure turbine stages in turn provide for an overall turbine volume that is reduced, and that accommodates desired increases in low pressure turbine speed.
- the reduced stages and reduced volume provide improve engine efficiency and aircraft fuel burn because overall weight is less.
- there are fewer blade rows there are: fewer leakage paths at the tips of the blades; fewer leakage paths at the inner air seals of vanes; and reduced losses through the rotor stages.
- the example disclosed compact turbine section includes a power density, which may be defined as thrust in pounds force (lbf) produced divided by the volume of the entire turbine section 28 .
- the volume of the turbine section 28 may be defined by an inlet 102 of a first turbine vane 104 in the high pressure turbine 54 to the exit 106 of the last rotating airfoil 108 in the low pressure turbine 46 , and may be expressed in cubic inches.
- the static thrust at the engine's flat rated Sea Level Takeoff condition divided by a turbine section volume is defined as power density and a greater power density may be desirable for reduced engine weight.
- the sea level take-off flat-rated static thrust may be defined in pounds-force (lbf), while the volume may be the volume from the annular inlet 102 of the first turbine vane 104 in the high pressure turbine 54 to the annular exit 106 of the downstream end of the last airfoil 108 in the low pressure turbine 46 .
- the maximum thrust may be Sea Level Takeoff Thrust “SLTO thrust” which is commonly defined as the flat-rated static thrust produced by the turbofan at sea-level.
- the volume V of the turbine section may be best understood from FIG. 10 .
- the mid turbine frame 58 is disposed between the high pressure turbine 54 , and the low pressure turbine 46 .
- the volume V is illustrated by a dashed line, and extends from an inner periphery I to an outer periphery O.
- the inner periphery is defined by the flow path of rotors, but also by an inner platform flow paths of vanes.
- the outer periphery is defined by the stator vanes and outer air seal structures along the flowpath.
- the volume extends from a most upstream end of the vane 104 , typically its leading edge, and to the most downstream edge of the last rotating airfoil 108 in the low pressure turbine section 46 . Typically this will be the trailing edge of the airfoil 108 .
- the power density would be greater than or equal to about 1.5 lbf/in 3 . More narrowly, the power density would be greater than or equal to about 2.0 lbf/in 3 . Even more narrowly, the power density would be greater than or equal to about 3.0 lbf/in 3 . More narrowly, the power density is greater than or equal to about 4.0 lbf/in 3 . Also, in embodiments, the power density is less than or equal to about 5.5 lbf/in 3 .
- An exit area 112 is defined at the exit location for the high pressure turbine 54 and an exit area 110 is defined at the outlet 106 of the low pressure turbine 46 .
- the gear reduction 48 (shown in FIG. 1 ) provides for a range of different rotational speeds of the fan drive turbine, which in this example embodiment is the low pressure turbine 46 , and the fan 42 ( FIG. 1 ). Accordingly, the low pressure turbine 46 , and thereby the low spool 30 including the low pressure compressor 44 may rotate at a very high speed.
- Low pressure turbine 46 and high pressure turbine 54 operation may be evaluated looking at a performance quantity which is the exit area for the respective turbine section multiplied by its respective speed squared. This performance quantity (“PQ”) is defined as:
- a lpt is the area 110 of the low pressure turbine 46 at the exit 106
- V lpt is the speed of the low pressure turbine section
- a hpt is the area of the high pressure turbine 54 at the exit 114
- V hpt is the speed of the high pressure turbine 54 .
- a ratio of the performance quantity for the low pressure turbine 46 compared to the performance quantify for the high pressure turbine 54 is:
- the areas of the low and high pressure turbines 46 , 54 are 557.9 in 2 and 90.67 in 2 , respectively. Further, the speeds of the low and high pressure turbine 46 , 54 are 10179 rpm and 24346 rpm, respectively.
- the performance quantities for the example low and high pressure turbines 46 , 54 are:
- the ratio is greater than about 0.5 and in another embodiment the ratio is greater than about 0.8.
- PQ ltp /PQ hpt ratios in the 0.5 to 1.5 range a very efficient overall gas turbine engine is achieved. More narrowly, PQ ltp /PQ hpt ratios of above or equal to about 0.8 provides increased overall gas turbine efficiency. Even more narrowly, PQ ltp /PQ hpt ratios above or equal to 1.0 are even more efficient thermodynamically and from an enable a reduction in weight that improves aircraft fuel burn efficiency.
- the turbine section 28 can be made much smaller than in the prior art, both in diameter and axial length. In addition, the efficiency of the overall engine is greatly increased.
- portions of the low pressure compressor 44 and the low pressure turbine 46 of the low spool 30 are schematically shown and include rotors 116 of the low pressure turbine 46 and rotors 132 of the low pressure compressor 44 .
- the rotors for each of the low compressor 44 and the low pressure turbine 46 rotate at an increased speed compared to prior art low spool configurations.
- Each of the rotors 116 includes a bore radius 122 , a live disk radius 124 and a bore width 126 in a direction parallel to the axis A.
- the rotors 116 support turbine blades 118 that rotate relative to the turbine vanes 120 .
- the low pressure compressor 44 includes rotors 132 including a bore radius 134 , a live disk radius 136 and a bore width 138 in a direction parallel to the axis A.
- the rotors 132 support compressor blades 128 that rotate relative to vanes 130 .
- the bore radius 122 is that radius between an inner most surface of the bore and the axis.
- the live disk radius 124 is the radial distance from the axis of rotation A and a portion of the rotor supporting airfoil blades.
- the bore width 126 of the rotor in this example is the greatest width of the rotor and is disposed at a radial distance spaced apart from the axis A determined to provide desired physical performance properties.
- the increased speed of the low spool 30 as provided by the increased speeds of the disclosed compact turbine section 28 is provided by a relationship between the live disk radius 124 (r) to the bore radius 122 (R) defined by a ratio of the live disk radius 124 over the bore radius 122 (i.e., r/R).
- the ratio is between about 2.00 and about 2.30.
- the ratio of r/R is between about 2.00 and 2.25.
- the rotors 116 and 132 include the bore width 126 and 138 (W).
- the bore widths 126 and 138 are widths at the bore that are separate from a shaft such as the low shaft 40 of the low spool ( FIG. 1 ).
- the widths 126 , 138 (W) are between about 1.40 and 2.00 inches (3.56 and 5.08 cm).
- the widths 126 , 138 (W) are between about 1.50 and 1.90 inches (3.81 and 4.83 cm).
- a relationship between the widths 126 , 138 (W) and the live rim radius 124 (r) is defined by ratio of r/W. In a disclosed example the ratio r/W is between about 4.65 and 5.55. In another disclosed embodiment the ratio of r/W is between about 4.75 and about 5.50.
- FIG. 13 shows an embodiment 200 , wherein there is a fan drive turbine 208 driving a shaft 206 to in turn drive a fan rotor 202 .
- a gear reduction 204 may be positioned between the fan drive turbine 208 and the fan rotor 202 .
- This gear reduction 204 may be structured and operate like the gear reduction disclosed above.
- a compressor rotor 210 is driven by an intermediate pressure turbine 212
- a second stage compressor rotor 214 is driven by a turbine rotor 216 .
- a combustion section 218 is positioned intermediate the compressor rotor 214 and the turbine section 216 .
- FIG. 14 shows yet another embodiment 300 wherein a fan rotor 302 and a first stage compressor 304 rotate at a common speed.
- the gear reduction 306 (which may be structured as disclosed above) is intermediate the compressor rotor 304 and a shaft 308 which is driven by a fan drive turbine.
- the embodiments 200 , 300 of FIG. 13 or 14 may be utilized with the features disclosed above.
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Abstract
Description
- This application is a continuation in part of U.S. application Ser. No. 13/629,681 filed on Sep. 28, 2012, which is a continuation in part of U.S. application Ser. No. 13/363,154 filed on Jan. 31, 2012.
- A gas turbine engine typically includes a fan section, a compressor section, a combustor section and a turbine section. Air entering the compressor section is compressed and delivered into the combustion section where it is mixed with fuel and ignited to generate a high-speed exhaust gas flow. The high-speed exhaust gas flow expands through the turbine section to drive the compressor and the fan section. The compressor section typically includes low and high pressure compressors, and the turbine section includes low and high pressure turbines.
- The high pressure turbine drives the high pressure compressor through an outer shaft to form a high spool, and the low pressure turbine drives the low pressure compressor through an inner shaft to form a low spool. The inner shaft may also drive the fan section. A direct drive gas turbine engine includes a fan section driven by the inner shaft such that the low pressure compressor, low pressure turbine and fan section rotate at a common speed in a common direction.
- A speed reduction device such as an epicyclical gear assembly may be utilized to drive the fan section such that the fan section may rotate at a speed different than the turbine section so as to increase the overall propulsive efficiency of the engine. In such engine architectures, a shaft driven by one of the turbine sections provides an input to the epicyclical gear assembly that drives the fan section at a speed different than the turbine section such that both the turbine section and the fan section can rotate at closer to optimal speeds.
- Although geared architectures have improved propulsive efficiency, turbine engine manufacturers continue to seek further improvements to engine performance including improvements to thermal, transfer and propulsive efficiencies.
- A gas turbine engine according to an exemplary embodiment of this disclosure, among other possible things includes a fan rotatable about an axis, a compressor section, a combustor in fluid communication with the compressor section, and a turbine section in fluid communication with the combustor. The turbine section includes a fan drive turbine and a second turbine. The second turbine is disposed forward of the fan drive turbine. The fan drive turbine includes at least one rotor having a bore radius (R) and a live rim radius (r). A ratio of r/R is between about 2.00 and about 2.30. A speed change system is driven by the fan drive turbine for rotating the fan about the axis.
- In a further embodiment of the foregoing engine, the bore radius (R) includes at least one bore width (W) in a direction parallel to the axis of rotation. A ratio of the bore width (W) to the live rim radius (r) is between about 4.65 and about 5.55.
- In a further embodiment of any of the foregoing engines, the bore radius (R) includes at least one bore width (W) in a direction parallel to the axis of rotation. The bore width (W) is between about 1.20 inches and about 2.00 inches where the bore width (W) is an unattached disk bore.
- In a further embodiment of any of the foregoing engines, the fan drive turbine section has a first exit area and rotates at a first speed. The second turbine section has a second exit area and rotates at a second speed, which is faster than the first speed. A first performance quantity is defined as the product of the first speed squared and the first area. A second performance quantity is defined as the product of the second speed squared and the second area. A performance ratio of the first performance quantity to the second performance quantity is between about 0.5 and about 1.5.
- In a further embodiment of any of the foregoing engines, the performance ratio is above or equal to about 0.8.
- In a further embodiment of any of the foregoing engines, the first performance quantity is above or equal to about 4.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox. The fan and the fan drive turbine both rotate in a first direction about the axis. The second turbine section rotates in a second direction opposite the first direction.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox. The fan, the fan drive turbine, and the second turbine section all rotate in a first direction about the axis.
- In a further embodiment of any of the foregoing engines, the speed change system comprises a gearbox. The fan and the second turbine both rotate in a first direction about the axis. The fan drive turbine rotates in a second direction opposite the first direction.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox. The fan is rotatable in a first direction and the fan drive turbine, and the second turbine section rotate in a second direction opposite the first direction about the axis.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gear reduction having a gear ratio greater than about 2.3.
- In a further embodiment of any of the foregoing engines, the fan delivers a portion of air into a bypass duct, and a bypass ratio being defined as the portion of air delivered into the bypass duct divided by the amount of air delivered into the compressor section, with the bypass ratio being greater than about 6.0.
- In a further embodiment of any of the foregoing engines, the bypass ratio is greater than about 10.0.
- In a further embodiment of any of the foregoing engines, a fan pressure ratio across the fan is less than about 1.5.
- In a further embodiment of any of the foregoing engines, the fan has about 26 or fewer blades.
- In a further embodiment of any of the foregoing engines, the fan drive turbine section has at least 3 stages and up to 6 stages.
- In a further embodiment of any of the foregoing engines, a ratio between the number of fan blades and the number of fan drive turbine stages is between about 2.5 and about 8.5.
- In a further embodiment of any of the foregoing engines, a pressure ratio across the fan drive turbine is greater than about 5:1.
- In a further embodiment of any of the foregoing engines, includes a power density greater than about 1.5 lbf/in3 and less than or equal to about 5.5 lbf/in3.
- In a further embodiment of any of the foregoing engines, the second turbine includes at least two stages and performs at a first pressure ratio. The fan drive turbine includes more than two stages and performs at a second pressure ratio less than the first pressure ratio.
- A gas turbine engine according to an exemplary embodiment of this disclosure, among other possible things includes a fan rotatable about an axis, a compressor section, a combustor in fluid communication with the compressor section, and a turbine section in fluid communication with the combustor. The turbine section includes a fan drive turbine and a second turbine. The second turbine is disposed forward of the fan drive turbine. The fan drive turbine includes at least one rotor having a live rim radius (r), and a bore width (W) in a direction parallel to the axis of rotation. A ratio of the bore width (W) to the live rim radius (r) is between about 4.65 and about 5.55. A speed change system is driven by the fan drive turbine for rotating the fan about the axis.
- In a further embodiment of the foregoing engine, the bore width (W) is between about 1.20 inches and about 2.00 inches where the bore width (W) is an unattached disk bore.
- In a further embodiment of any of the foregoing engines, the rotor has a bore radius (R). A ratio of the live rim radius (r) and the bore radius (R) is between about 2.00 and about 2.30.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox and the fan and the fan drive turbine both rotate in a first direction about the axis. The second turbine section rotates in a second direction opposite the first direction.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox. The fan, the fan drive turbine, and the second turbine section all rotate in a first direction about the axis.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox. The fan and the second turbine both rotate in a first direction about the axis. The fan drive turbine rotates in a second direction opposite the first direction.
- In a further embodiment of any of the foregoing engines, the speed change system includes a gearbox. The fan is rotatable in a first direction and the fan drive turbine, and the second turbine section rotate in a second direction opposite the first direction about the axis.
- In a further embodiment of any of the foregoing engines, the fan drive turbine is one of three turbine rotors including the fan drive turbine driving the fan, the second turbine that drives a compressor rotor and one other turbine driving another compressor rotor of the compressor section.
- In a further embodiment of any of the foregoing engines, the speed change system is positioned intermediate the fan drive turbine and a compressor driven by the fan drive turbine.
- Although the different examples have the specific components shown in the illustrations, embodiments of this disclosure are not limited to those particular combinations. It is possible to use some of the components or features from one of the examples in combination with features or components from another one of the examples.
- These and other features disclosed herein can be best understood from the following specification and drawings, the following of which is a brief description.
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FIG. 1 is a schematic view of an example gas turbine engine. -
FIG. 2 is a schematic view indicating relative rotation between sections of an example gas turbine engine. -
FIG. 3 is another schematic view indicating relative rotation between sections of an example gas turbine engine. -
FIG. 4 is another schematic view indicating relative rotation between sections of an example gas turbine engine. -
FIG. 5 is another a schematic view indicating relative rotation between sections of an example gas turbine engine. -
FIG. 6 is a schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine. -
FIG. 7 is another schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine. -
FIG. 8A is another schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine. -
FIG. 8B is an enlarged view of the example bearing configuration shown inFIG. 8A . -
FIG. 9 is another schematic view of a bearing configuration supporting rotation of example high and low spools of the example gas turbine engine. -
FIG. 10 is a schematic view of an example compact turbine section. -
FIG. 11 is a schematic cross-section of example stages for the disclosed example gas turbine engine. -
FIG. 12 is a schematic view an example turbine rotor perpendicular to the axis or rotation. -
FIG. 13 is another embodiment of an example gas turbine engine for use with the present invention. -
FIG. 14 is yet another embodiment of an example gas turbine engine for use with the present invention. -
FIG. 1 schematically illustrates an examplegas turbine engine 20 that includes afan section 22, acompressor section 24, acombustor section 26 and aturbine section 28. Alternative engines might include an augmenter section (not shown) among other systems or features. Thefan section 22 drives air along a bypass flow path B while thecompressor section 24 draws air in along a core flow path C where air is compressed and communicated to acombustor section 26. In thecombustor section 26, air is mixed with fuel and ignited to generate a high pressure exhaust gas stream that expands through theturbine section 28 where energy is extracted and utilized to drive thefan section 22 and thecompressor section 24. - Although the disclosed non-limiting embodiment depicts a turbofan gas turbine engine, it should be understood that the concepts described herein are not limited to use with turbofans as the teachings may be applied to other types of turbine engines; for example a turbine engine including a three-spool architecture in which three spools concentrically rotate about a common axis such that a low spool enables a low pressure turbine to drive a fan via a gearbox, an intermediate spool enables an intermediate pressure turbine to drive a first compressor of the compressor section, and a high spool enables a high pressure turbine to drive a high pressure compressor of the compressor section.
- The
example engine 20 generally includes alow speed spool 30 and ahigh speed spool 32 mounted for rotation about an engine central longitudinal axis A relative to an enginestatic structure 36 viaseveral bearing systems 38. It should be understood that various bearingsystems 38 at various locations may alternatively or additionally be provided. - The
low speed spool 30 generally includes aninner shaft 40 that connects afan 42 and a low pressure (or first)compressor section 44 to a low pressure (or first)turbine section 46. Theinner shaft 40 drives thefan 42 through a speed change device, such as a gearedarchitecture 48, to drive thefan 42 at a lower speed than thelow speed spool 30. The high-speed spool 32 includes anouter shaft 50 that interconnects a high pressure (or second)compressor section 52 and a high pressure (or second)turbine section 54. Theinner shaft 40 and theouter shaft 50 are concentric and rotate via the bearingsystems 38 about the engine central longitudinal axis A. - A
combustor 56 is arranged between thehigh pressure compressor 52 and thehigh pressure turbine 54. In one example, thehigh pressure turbine 54 includes at least two stages to provide a double stagehigh pressure turbine 54. In another example, thehigh pressure turbine 54 includes only a single stage. As used herein, a “high pressure” compressor or turbine experiences a higher pressure than a corresponding “low pressure” compressor or turbine. - The example
low pressure turbine 46 has a pressure ratio that is greater than about 5. The pressure ratio of the examplelow pressure turbine 46 is measured prior to an inlet of thelow pressure turbine 46 as related to the pressure measured at the outlet of thelow pressure turbine 46 prior to an exhaust nozzle. - A
mid-turbine frame 58 of the enginestatic structure 36 is arranged generally between thehigh pressure turbine 54 and thelow pressure turbine 46. Themid-turbine frame 58 furthersupports bearing systems 38 in theturbine section 28 as well as setting airflow entering thelow pressure turbine 46. - The core airflow C is compressed by the
low pressure compressor 44 then by thehigh pressure compressor 52 mixed with fuel and ignited in thecombustor 56 to produce high speed exhaust gases that are then expanded through thehigh pressure turbine 54 andlow pressure turbine 46. Themid-turbine frame 58 includesvanes 60, which are in the core airflow path and function as an inlet guide vane for thelow pressure turbine 46. Utilizing thevane 60 of themid-turbine frame 58 as the inlet guide vane forlow pressure turbine 46 decreases the length of thelow pressure turbine 46 without increasing the axial length of themid-turbine frame 58. Reducing or eliminating the number of vanes in thelow pressure turbine 46 shortens the axial length of theturbine section 28. Thus, the compactness of thegas turbine engine 20 is increased and a higher power density may be achieved. - The disclosed
gas turbine engine 20 in one example is a high-bypass geared aircraft engine. In a further example, thegas turbine engine 20 includes a bypass ratio greater than about six (6), with an example embodiment being greater than about ten (10). The example gearedarchitecture 48 is an epicyclical gear train, such as a planetary gear system, star gear system or other known gear system, with a gear reduction ratio of greater than about 2.3. - In one disclosed embodiment, the
gas turbine engine 20 includes a bypass ratio greater than about ten (10:1) and the fan diameter is significantly larger than an outer diameter of thelow pressure compressor 44. It should be understood, however, that the above parameters are only exemplary of one embodiment of a gas turbine engine including a geared architecture and that the present disclosure is applicable to other gas turbine engines. - A significant amount of thrust is provided by the bypass flow B due to the high bypass ratio. The
fan section 22 of theengine 20 is designed for a particular flight condition—typically cruise at about 0.8 Mach and about 35,000 feet. The flight condition of 0.8 Mach and 35,000 ft., with the engine at its best cruise fuel consumption relative to the thrust it produces—also known as “bucket cruise Thrust Specific Fuel Consumption (‘TSFCT’)”—is the industry standard parameter of pound-mass (lbm) of fuel per hour being burned divided by pound-force (lbf) of thrust the engine produces at that minimum bucket cruise point. - “Low fan pressure ratio” is the pressure ratio across the fan blade alone, without a Fan Exit Guide Vane (“FEGV”) system. The low fan pressure ratio as disclosed herein according to one non-limiting embodiment is less than about 1.50. In another non-limiting embodiment the low fan pressure ratio is less than about 1.45.
- “Low corrected fan tip speed” is the actual fan tip speed in ft/sec divided by an industry standard temperature correction of [(Tram ° R)/(518.7° R)]0.5. The “Low corrected fan tip speed”, as disclosed herein according to one non-limiting embodiment, is less than about 1150 ft/second.
- The example gas turbine engine includes the
fan 42 that comprises in one non-limiting embodiment less than about 26 fan blades. In another non-limiting embodiment, thefan section 22 includes less than about 18 fan blades. Moreover, in one disclosed embodiment thelow pressure turbine 46 includes no more than about 6 turbine stages schematically indicated at 34. In another non-limiting example embodiment thelow pressure turbine 46 includes about 3 or more turbine stages. A ratio between the number offan blades 42 and the number of low pressure turbine stages is between about 2.5 and about 8.5. The examplelow pressure turbine 46 provides the driving power to rotate thefan section 22 and therefore the relationship between the number of turbine stages 34 in thelow pressure turbine 46 and the number ofblades 42 in thefan section 22 disclose an examplegas turbine engine 20 with increased power transfer efficiency. - Increased power transfer efficiency is provided due in part to the increased use of improved turbine blade materials and manufacturing methods such as directionally solidified castings, and single crystal materials that enable increased turbine speed and a reduced number of stages. Moreover, the example
low pressure turbine 46 includes improved turbine disks configurations that further enable desired durability at the higher turbine speeds. - Referring to
FIGS. 2 and 3 , an example disclosed speed change device is an epicyclical gearbox of a planet type, where the input is to the center “sun”gear 62. Planet gears 64 (only one shown) around thesun gear 62 rotate and are spaced apart by acarrier 68 that rotates in a direction common to thesun gear 62. Aring gear 66, which is non-rotatably fixed to the engine static casing 36 (shown inFIG. 1 ), contains the entire gear assembly. Thefan 42 is attached to and driven by thecarrier 68 such that the direction of rotation of thefan 42 is the same as the direction of rotation of thecarrier 68 that, in turn, is the same as the direction of rotation of theinput sun gear 62. - In the following figures nomenclature is utilized to define the relative rotations between the various sections of the
gas turbine engine 20. The fan section is shown with a “+” sign indicating rotation in a first direction. Rotations relative to thefan section 22 of other features of the gas turbine engine are further indicated by the use of either a “+” sign or a “−” sign. The “−” sign indicates a rotation that is counter to that of any component indicated with a “+” sign. - Moreover, the term fan drive turbine is utilized to indicate the turbine that provides the driving power for rotating the
blades 42 of thefan section 22. Further, the term “second turbine” is utilized to indicate the turbine before the fan drive turbine that is not utilized to drive thefan 42. In this disclosed example, the fan drive turbine is thelow pressure turbine 46, and the second turbine is thehigh pressure turbine 54. However, it should be understood that other turbine section configurations that include more than the shown high andlow pressure turbines fan section 22 and is within the contemplation of this disclosure. - In one disclosed example embodiment (
FIG. 2 ) the fan drive turbine is thelow pressure turbine 46 and therefore thefan section 22 andlow pressure turbine 46 rotate in a common direction as indicated by the common “+” sign indicating rotation of both thefan 42 and thelow pressure turbine 46. Moreover in this example, thehigh pressure turbine 54 or second turbine rotates in a direction common with thefan drive turbine 46. In another example shown inFIG. 3 , thehigh pressure turbine 54 or second turbine rotates in a direction opposite the fan drive turbine (low pressure turbine 46) and thefan 42. - Counter rotating the
low pressure compressor 44 and thelow pressure turbine 46 relative to thehigh pressure compressor 52 and thehigh pressure turbine 54 provides certain efficient aerodynamic conditions in theturbine section 28 as the generated high speed exhaust gas flow moves from thehigh pressure turbine 54 to thelow pressure turbine 46. The relative rotations in the compressor and turbine sections provide approximately the desired airflow angles between the sections, which improves overall efficiency in theturbine section 28, and provides a reduction in overall weight of theturbine section 28 by reducing or eliminating airfoils or an entire row of vanes. - Referring to
FIGS. 4 and 5 , another example disclosed speed change device is an epicyclical gearbox referred to as a star type gearbox, where the input is to the center “sun”gear 62. Star gears 65 (only one shown) around thesun gear 62 rotate in a fixed position around the sun gear and are spaced apart by acarrier 68 that is fixed to a static casing 36 (best shown inFIG. 1 ). Aring gear 66 that is free to rotate contains the entire gear assembly. Thefan 42 is attached to and driven by thering gear 66 such that the direction of rotation of thefan 42 is opposite the direction of rotation of theinput sun gear 62. Accordingly, thelow pressure compressor 44 and thelow pressure turbine 46 rotate in a direction opposite rotation of thefan 42. - In one disclosed example embodiment shown in
FIG. 4 , the fan drive turbine is thelow pressure turbine 46 and therefore thefan 42 rotates in a direction opposite that of thelow pressure turbine 46 and thelow pressure compressor 44. Moreover in this example thehigh spool 32 including thehigh pressure turbine 54 and thehigh pressure compressor 52 rotate in a direction counter to thefan 42 and common with thelow spool 30 including thelow pressure compressor 44 and thefan drive turbine 46. - In another example gas turbine engine shown in
FIG. 5 , the high pressure orsecond turbine 54 rotates in a direction common with thefan 42 and counter to thelow spool 30 including thelow pressure compressor 44 and thefan drive turbine 46. - Referring to
FIG. 6 , the bearing assemblies near the forward end of the shafts in the engine atlocations inner shaft 40 and theouter shaft 50, counter net thrust forces in a direction parallel to the axis A that are generated by the rearward load oflow pressure turbine 46 and thehigh pressure turbine 54, minus thehigh pressure compressor 52 and thelow pressure compressor 44, which also contribute to the thrust forces acting on the correspondinglow spool 30 and thehigh spool 32. - In this example embodiment, a first
forward bearing assembly 70 is supported on a portion of the static structure schematically shown at 36 and supports a forward end of theinner shaft 40. The example first forward bearingassembly 70 is a thrust bearing and controls movement of theinner shaft 40 and thereby thelow spool 30 in an axial direction. A second forward bearingassembly 72 is supported by thestatic structure 36 to support rotation of thehigh spool 32 and substantially prevent movement along in an axial direction of theouter shaft 50. The first forward bearingassembly 70 is mounted to support theinner shaft 40 at a point forward of aconnection 88 of a lowpressure compressor rotor 90. The second forward bearingassembly 72 is mounted forward of a connection referred to as ahub 92 between a highpressure compressor rotor 94 and theouter shaft 50. A firstaft bearing assembly 74 supports the aft portion of theinner shaft 40. The firstaft bearing assembly 74 is a roller bearing and supports rotation, but does not provide resistance to movement of theshaft 40 in the axial direction. Instead, the aft bearing 74 allows theshaft 40 to expand thermally between its location and thebearing 72. The example first aft bearingassembly 74 is disposed aft of aconnection hub 80 between a lowpressure turbine rotor 78 and theinner shaft 40. A secondaft bearing assembly 76 supports the aft portion of theouter shaft 50. The example second aft bearingassembly 76 is a roller bearing and is supported by a correspondingstatic structure 36 through themid turbine frame 58 which transfers the radial load of the shaft across the turbine flow path to ground 36. The secondaft bearing assembly 76 supports theouter shaft 50 and thereby thehigh spool 32 at a point aft of aconnection hub 84 between a highpressure turbine rotor 82 and theouter shaft 50. - In this disclosed example, the first and second forward bearing
assemblies aft bearing assemblies turbine connection hubs inner shaft 40 andouter shaft 50. The straddle support of theinner shaft 40 and theouter shaft 50 provide a support and stiffness desired for operation of thegas turbine engine 20. - Referring to
FIG. 7 , another example shaft support configuration includes the first and second forward bearingassemblies inner shaft 40 andouter shaft 50. The first aft bearing 74 is disposed aft of theconnection 80 between therotor 78 and theinner shaft 40. The first aft bearing 74 is a roller bearing and supports theinner shaft 40 in a straddle configuration. The straddle configuration can require additional length of theinner shaft 40 and therefore an alternate configuration referred to as an overhung configuration can be utilized. In this example theouter shaft 50 is supported by the secondaft bearing assembly 76 that is disposed forward of theconnection 84 between the highpressure turbine rotor 82 and theouter shaft 50. Accordingly, theconnection hub 84 of the highpressure turbine rotor 82 to theouter shaft 50 is overhung aft of the bearingassembly 76. This positioning of the second aft bearing 76 in an overhung orientation potentially provides for a reduced length of theouter shaft 50. - Moreover the positioning of the aft bearing 76 may also eliminate the need for other support structures such as the
mid turbine frame 58 as both thehigh pressure turbine 54 is supported at the bearingassembly 76 and thelow pressure turbine 46 is supported by the bearingassembly 74. Optionally the midturbine frame strut 58 can provide anoptional roller bearing 74A which can be added to reduce vibratory modes of theinner shaft 40. - Referring to
FIGS. 8A and 8B , another example shaft support configuration includes the first and second forward bearingassemblies inner shaft 40 and theouter shaft 50. The first aft bearing 74 provides support of theouter shaft 40 at a location aft of theconnection 80 in a straddle mount configuration. In this example, the aft portion of theouter shaft 50 is supported by aroller bearing assembly 86 supported within aspace 96 defined between an outer surface of theinner shaft 40 and an inner surface of theouter shaft 50. - The
roller bearing assembly 86 supports the aft portion of theouter shaft 50 on theinner shaft 40. The use of theroller bearing assembly 86 to support theouter shaft 50 eliminates the requirements for support structures that lead back to thestatic structure 36 through themid turbine frame 58. Moreover, theexample bearing assembly 86 can provide both a reduced shaft length, and support of theouter shaft 50 at a position substantially in axial alignment with theconnection hub 84 for the highpressure turbine rotor 82 and theouter shaft 50. As appreciated, the bearingassembly 86 is positioned aft of thehub 82 and is supported through the rearmost section ofshaft 50. Referring toFIG. 9 , another example shaft support configuration includes the first and second forward bearingassemblies inner shaft 40 and theouter shaft 50. The firstaft bearing assembly 74 is supported at a point along theinner shaft 40 forward of theconnection 80 between the lowpressure turbine rotor 78 and theinner shaft 40. - Positioning of the first aft bearing 74 forward of the
connection 80 can be utilized to reduce the overall length of theengine 20. Moreover, positioning of the firstaft bearing assembly 74 forward of theconnection 80 provides for support through themid turbine frame 58 to thestatic structure 36. Furthermore, in this example the secondaft bearing assembly 76 is deployed in a straddle mount configuration aft of theconnection 84 between theouter shaft 50 and therotor 82. Accordingly, in this example, both the first and secondaft bearing assemblies outer structure 36. As appreciated, such a common support feature provides for a less complex engine construction along with reducing the overall length of the engine. Moreover, the reduction or required support structures will reduce overall weight to provide a further improvement in aircraft fuel burn efficiency. - Referring to
FIG. 10 , a portion of theexample turbine section 28 is shown and includes thelow pressure turbine 46 and thehigh pressure turbine 54 with themid turbine frame 58 disposed between an outlet of the high pressure turbine and the low pressure turbine. Themid turbine frame 58 andvane 60 are positioned to be upstream of thefirst stage 98 of thelow pressure turbine 46. While asingle vane 60 is illustrated, it should be understood these would beplural vanes 60 spaced circumferentially. Thevane 60 redirects the flow downstream of thehigh pressure turbine 54 as it approaches thefirst stage 98 of thelow pressure turbine 46. As can be appreciated, it is desirable to improve efficiency to have flow between thehigh pressure turbine 54 and thelow pressure turbine 46 redirected by thevane 60 such that the flow of expanding gases is aligned as desired when entering thelow pressure turbine 46. Thereforevane 60 may be an actual airfoil with camber and turning, that aligns the airflow as desired into thelow pressure turbine 46. - By incorporating a true air-turning
vane 60 into themid turbine frame 58, rather than a streamlined strut and a stator vane row after the strut, the overall length and volume of the combinedturbine sections vane 60 serves several functions including streamlining themid turbine frame 58, protecting any static structure and any oil tubes servicing a bearing assembly from exposure to heat, and turning the flow entering thelow pressure turbine 46 such that it enters therotating airfoil 100 at a desired flow angle. Further, by incorporating these features together, the overall assembly and arrangement of theturbine section 28 is reduced in volume. - The above features achieve a more or less compact turbine section volume relative to the prior art including both high and
low pressure turbines low pressure turbine 46 can be improved to provide for a reduced volume. Such materials may include, for example, materials with increased thermal and mechanical capabilities to accommodate potentially increased stresses induced by operating thelow pressure turbine 46 at the increased speed. Furthermore, the elevated speeds and increased operating temperatures at the entrance to thelow pressure turbine 46 enables thelow pressure turbine 46 to transfer a greater amount of energy, more efficiently to drive both alarger diameter fan 42 through the gearedarchitecture 48 and an increase in compressor work performed by thelow pressure compressor 44. - Alternatively, lower priced materials can be utilized in combination with cooling features that compensate for increased temperatures within the
low pressure turbine 46. In three exemplary embodiments a firstrotating blade 100 of thelow pressure turbine 46 can be a directionally solidified casting blade, a single crystal casting blade or a hollow, internally cooled blade. The improved material and thermal properties of the example turbine blade material provide for operation at increased temperatures and speeds, that in turn provide increased efficiencies at each stage that thereby provide for use of a reduced number of low pressure turbine stages. The reduced number of low pressure turbine stages in turn provide for an overall turbine volume that is reduced, and that accommodates desired increases in low pressure turbine speed. - The reduced stages and reduced volume provide improve engine efficiency and aircraft fuel burn because overall weight is less. In addition, as there are fewer blade rows, there are: fewer leakage paths at the tips of the blades; fewer leakage paths at the inner air seals of vanes; and reduced losses through the rotor stages.
- The example disclosed compact turbine section includes a power density, which may be defined as thrust in pounds force (lbf) produced divided by the volume of the
entire turbine section 28. The volume of theturbine section 28 may be defined by aninlet 102 of afirst turbine vane 104 in thehigh pressure turbine 54 to theexit 106 of the lastrotating airfoil 108 in thelow pressure turbine 46, and may be expressed in cubic inches. The static thrust at the engine's flat rated Sea Level Takeoff condition divided by a turbine section volume is defined as power density and a greater power density may be desirable for reduced engine weight. The sea level take-off flat-rated static thrust may be defined in pounds-force (lbf), while the volume may be the volume from theannular inlet 102 of thefirst turbine vane 104 in thehigh pressure turbine 54 to theannular exit 106 of the downstream end of thelast airfoil 108 in thelow pressure turbine 46. The maximum thrust may be Sea Level Takeoff Thrust “SLTO thrust” which is commonly defined as the flat-rated static thrust produced by the turbofan at sea-level. - The volume V of the turbine section may be best understood from
FIG. 10 . As shown, themid turbine frame 58 is disposed between thehigh pressure turbine 54, and thelow pressure turbine 46. The volume V is illustrated by a dashed line, and extends from an inner periphery I to an outer periphery O. The inner periphery is defined by the flow path of rotors, but also by an inner platform flow paths of vanes. The outer periphery is defined by the stator vanes and outer air seal structures along the flowpath. The volume extends from a most upstream end of thevane 104, typically its leading edge, and to the most downstream edge of the lastrotating airfoil 108 in the lowpressure turbine section 46. Typically this will be the trailing edge of theairfoil 108. - The power density in the disclosed gas turbine engine is much higher than in the prior art. Eight exemplary engines are shown below which incorporate turbine sections and overall engine drive systems and architectures as set forth in this application, and can be found in Table I as follows:
-
TABLE 1 Turbine section Thrust/turbine Thrust SLTO volume from section volume Engine (lbf) the Inlet (lbf/in3) 1 17,000 3,859 4.40 2 23,300 5,330 4.37 3 29,500 6,745 4.37 4 33,000 6,745 4.84 5 96,500 31,086 3.10 6 96,500 62,172 1.55 7 96,500 46,629 2.07 8 37,098 6,745 5.50 - Thus, in example embodiments, the power density would be greater than or equal to about 1.5 lbf/in3. More narrowly, the power density would be greater than or equal to about 2.0 lbf/in3. Even more narrowly, the power density would be greater than or equal to about 3.0 lbf/in3. More narrowly, the power density is greater than or equal to about 4.0 lbf/in3. Also, in embodiments, the power density is less than or equal to about 5.5 lbf/in3.
- Engines made with the disclosed architecture, and including turbine sections as set forth in this application, and with modifications within the scope of this disclosure, thus provide very high efficient operation, and increased fuel efficiency and lightweight relative to their thrust capability.
- An
exit area 112 is defined at the exit location for thehigh pressure turbine 54 and anexit area 110 is defined at theoutlet 106 of thelow pressure turbine 46. The gear reduction 48 (shown inFIG. 1 ) provides for a range of different rotational speeds of the fan drive turbine, which in this example embodiment is thelow pressure turbine 46, and the fan 42 (FIG. 1 ). Accordingly, thelow pressure turbine 46, and thereby thelow spool 30 including thelow pressure compressor 44 may rotate at a very high speed.Low pressure turbine 46 andhigh pressure turbine 54 operation may be evaluated looking at a performance quantity which is the exit area for the respective turbine section multiplied by its respective speed squared. This performance quantity (“PQ”) is defined as: -
PQ ltp=(A lpt ×V lpt 2) Equation 1 -
PQ hpt=(A hpt ×V hpt 2) Equation 2 - where Alpt is the
area 110 of thelow pressure turbine 46 at theexit 106, Vlpt is the speed of the low pressure turbine section; Ahpt is the area of thehigh pressure turbine 54 at theexit 114, and where Vhpt is the speed of thehigh pressure turbine 54. - Thus, a ratio of the performance quantity for the
low pressure turbine 46 compared to the performance quantify for thehigh pressure turbine 54 is: -
(A lpt ×V lpt 2)/(A hpt ×V hpt 2)=PQ ltp /PQ hpt Equation 3 - In one turbine embodiment made according to the above design, the areas of the low and
high pressure turbines high pressure turbine high pressure turbines -
PQ ltp=(A lpt ×V lpt 2)=(557.9 in2)(10179 rpm)2=57805157673.9 in2 rpm2 Equation 1 -
PQ hpt=(A hpt ×V hpt 2)=(90.67 in2)(24346 rpm)2=53742622009.72 in2rpm2 Equation 2 - and using Equation 3 above, the ratio for the low pressure turbine section to the high pressure turbine section is:
-
Ratio=PQ ltp /PQ hpt=57805157673.9in2rpm2/53742622009.72in2rpm2=1.075 - In another embodiment, the ratio is greater than about 0.5 and in another embodiment the ratio is greater than about 0.8. With PQltp/PQhpt ratios in the 0.5 to 1.5 range, a very efficient overall gas turbine engine is achieved. More narrowly, PQltp/PQhpt ratios of above or equal to about 0.8 provides increased overall gas turbine efficiency. Even more narrowly, PQltp/PQhpt ratios above or equal to 1.0 are even more efficient thermodynamically and from an enable a reduction in weight that improves aircraft fuel burn efficiency. As a result of these PQltp/PQhpt ratios, in particular, the
turbine section 28 can be made much smaller than in the prior art, both in diameter and axial length. In addition, the efficiency of the overall engine is greatly increased. - Referring to
FIG. 11 , portions of thelow pressure compressor 44 and thelow pressure turbine 46 of thelow spool 30 are schematically shown and includerotors 116 of thelow pressure turbine 46 androtors 132 of thelow pressure compressor 44. The rotors for each of thelow compressor 44 and thelow pressure turbine 46 rotate at an increased speed compared to prior art low spool configurations. Each of therotors 116 includes abore radius 122, alive disk radius 124 and abore width 126 in a direction parallel to the axis A. Therotors 116support turbine blades 118 that rotate relative to theturbine vanes 120. Thelow pressure compressor 44 includesrotors 132 including abore radius 134, alive disk radius 136 and abore width 138 in a direction parallel to the axis A. Therotors 132support compressor blades 128 that rotate relative to vanes 130. - Referring to
FIG. 12 , with continued reference toFIG. 11 , thebore radius 122 is that radius between an inner most surface of the bore and the axis. Thelive disk radius 124 is the radial distance from the axis of rotation A and a portion of the rotor supporting airfoil blades. Thebore width 126 of the rotor in this example is the greatest width of the rotor and is disposed at a radial distance spaced apart from the axis A determined to provide desired physical performance properties. - The increased speed of the
low spool 30 as provided by the increased speeds of the disclosedcompact turbine section 28 is provided by a relationship between the live disk radius 124 (r) to the bore radius 122 (R) defined by a ratio of thelive disk radius 124 over the bore radius 122 (i.e., r/R). In the disclosed example embodiment the ratio is between about 2.00 and about 2.30. In another disclosed example embodiment, the ratio of r/R is between about 2.00 and 2.25. - The
rotors bore width 126 and 138 (W). Thebore widths low shaft 40 of the low spool (FIG. 1 ). In one non-limiting dimensional embodiment, thewidths 126, 138 (W) are between about 1.40 and 2.00 inches (3.56 and 5.08 cm). In another non-limiting dimensional embodiment, thewidths 126, 138 (W) are between about 1.50 and 1.90 inches (3.81 and 4.83 cm). Moreover, a relationship between thewidths 126, 138 (W) and the live rim radius 124 (r) is defined by ratio of r/W. In a disclosed example the ratio r/W is between about 4.65 and 5.55. In another disclosed embodiment the ratio of r/W is between about 4.75 and about 5.50. - Accordingly, the increased performance attributes and performance are provided by desirable combinations of the disclosed features of the various components of the described and disclosed gas turbine engine embodiments.
-
FIG. 13 shows anembodiment 200, wherein there is afan drive turbine 208 driving ashaft 206 to in turn drive afan rotor 202. Agear reduction 204 may be positioned between thefan drive turbine 208 and thefan rotor 202. Thisgear reduction 204 may be structured and operate like the gear reduction disclosed above. Acompressor rotor 210 is driven by anintermediate pressure turbine 212, and a second stage compressor rotor 214 is driven by aturbine rotor 216. A combustion section 218 is positioned intermediate the compressor rotor 214 and theturbine section 216. -
FIG. 14 shows yet anotherembodiment 300 wherein afan rotor 302 and afirst stage compressor 304 rotate at a common speed. The gear reduction 306 (which may be structured as disclosed above) is intermediate thecompressor rotor 304 and ashaft 308 which is driven by a fan drive turbine. - The
embodiments FIG. 13 or 14 may be utilized with the features disclosed above. - Although an example embodiment has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the scope and content of this disclosure.
Claims (29)
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
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US14/662,387 US20150345426A1 (en) | 2012-01-31 | 2015-03-19 | Geared turbofan gas turbine engine architecture |
CA2923331A CA2923331A1 (en) | 2015-03-19 | 2016-03-08 | Geared turbofan gas turbine engine architecture |
BR102016005922A BR102016005922A2 (en) | 2015-03-19 | 2016-03-17 | gas turbine engine |
EP16161464.9A EP3070315A1 (en) | 2015-03-19 | 2016-03-21 | Geared turbofan gas turbine engine architecture |
US15/393,697 US9739206B2 (en) | 2012-01-31 | 2016-12-29 | Geared turbofan gas turbine engine architecture |
US15/405,498 US10288010B2 (en) | 2012-01-31 | 2017-01-13 | Geared turbofan gas turbine engine architecture |
US15/420,155 US9828944B2 (en) | 2012-01-31 | 2017-01-31 | Geared turbofan gas turbine engine architecture |
US15/447,703 US20170268428A1 (en) | 2012-01-31 | 2017-03-02 | Geared turbofan gas turbine engine architecture |
US15/488,580 US20170298833A1 (en) | 2012-01-31 | 2017-04-17 | Geared turbofan gas turbine engine architecture |
US15/488,805 US20170298835A1 (en) | 2012-01-31 | 2017-04-17 | Geared turbofan gas turbine engine architecture |
US15/488,630 US10288011B2 (en) | 2012-01-31 | 2017-04-17 | Geared turbofan gas turbine engine architecture |
US15/652,369 US20170335796A1 (en) | 2012-01-31 | 2017-07-18 | Geared turbofan gas turbine engine architecture |
US15/962,039 US20180245541A1 (en) | 2012-01-31 | 2018-04-25 | Geared turbofan gas turbine engine architecture |
US16/149,203 US20190024610A1 (en) | 2012-01-31 | 2018-10-02 | Geared turbofan gas turbine engine architecture |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US13/363,154 US20130192196A1 (en) | 2012-01-31 | 2012-01-31 | Gas turbine engine with high speed low pressure turbine section |
US13/629,681 US20130192266A1 (en) | 2012-01-31 | 2012-09-28 | Geared turbofan gas turbine engine architecture |
US14/662,387 US20150345426A1 (en) | 2012-01-31 | 2015-03-19 | Geared turbofan gas turbine engine architecture |
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US13/629,681 Continuation-In-Part US20130192266A1 (en) | 2012-01-31 | 2012-09-28 | Geared turbofan gas turbine engine architecture |
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US15/393,697 Continuation US9739206B2 (en) | 2012-01-31 | 2016-12-29 | Geared turbofan gas turbine engine architecture |
US15/405,498 Continuation US10288010B2 (en) | 2012-01-31 | 2017-01-13 | Geared turbofan gas turbine engine architecture |
US15/420,155 Continuation US9828944B2 (en) | 2012-01-31 | 2017-01-31 | Geared turbofan gas turbine engine architecture |
US15/447,703 Continuation US20170268428A1 (en) | 2012-01-31 | 2017-03-02 | Geared turbofan gas turbine engine architecture |
US15/488,630 Continuation US10288011B2 (en) | 2012-01-31 | 2017-04-17 | Geared turbofan gas turbine engine architecture |
US15/488,580 Continuation US20170298833A1 (en) | 2012-01-31 | 2017-04-17 | Geared turbofan gas turbine engine architecture |
US15/488,805 Continuation US20170298835A1 (en) | 2012-01-31 | 2017-04-17 | Geared turbofan gas turbine engine architecture |
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US15/652,369 Abandoned US20170335796A1 (en) | 2012-01-31 | 2017-07-18 | Geared turbofan gas turbine engine architecture |
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US16/149,203 Abandoned US20190024610A1 (en) | 2012-01-31 | 2018-10-02 | Geared turbofan gas turbine engine architecture |
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2018
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US9828944B2 (en) | 2017-11-28 |
US20170298833A1 (en) | 2017-10-19 |
US20170122215A1 (en) | 2017-05-04 |
US20190024610A1 (en) | 2019-01-24 |
US9739206B2 (en) | 2017-08-22 |
US20180245541A1 (en) | 2018-08-30 |
US10288011B2 (en) | 2019-05-14 |
US10288010B2 (en) | 2019-05-14 |
US20170138308A1 (en) | 2017-05-18 |
US20170335796A1 (en) | 2017-11-23 |
US20170298835A1 (en) | 2017-10-19 |
US20170298834A1 (en) | 2017-10-19 |
US20180119643A1 (en) | 2018-05-03 |
US20170268428A1 (en) | 2017-09-21 |
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