the compressor comprising only axial stages

Industry

CPC
F02C3/06

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Parent Industries

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F02Combustion engines F02CGAS-TURBINE PLANTS AIR INTAKES FOR JET-PROPULSION PLANTS CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS F02C3/00Gas-turbine plants characterised by the use of combustion products as the working fluid

Current Industry

F02C3/06the compressor comprising only axial stages

Industries

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Patents Grantslast 30 patents

Information Patent Grant
Unducted propulsion system
- Patent number 12,264,619
- Issue date Apr 1, 2025
- General Electric Company
- Syed Arif Khalid
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Turbine engine including a gas path component having a hydrophobic...
- Patent number 12,253,023
- Issue date Mar 18, 2025
- General Electric Company
- Arthur W. Sibbach
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Counter-rotating gas turbine engines including turbine sections wit...
- Patent number 12,247,516
- Issue date Mar 11, 2025
- General Electric Company
- Ranganayakulu Alapati
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Control of leakage for gas turbine engine compressor blades
- Patent number 12,228,142
- Issue date Feb 18, 2025
- RTX Corporation
- Luis Manuel Torres
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Turbomachinery engines with high-speed low-pressure turbines
- Patent number 12,221,930
- Issue date Feb 11, 2025
- General Electric Company
- Pranav R. Kamat
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Partial exhaust condensation intercooling
- Patent number 12,215,622
- Issue date Feb 4, 2025
- RTX Corporation
- Neil J. Terwilliger
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Partial exhaust bottoming cycle
- Patent number 12,215,623
- Issue date Feb 4, 2025
- RTX Corporation
- Neil J. Terwilliger
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Fluidic compressor inlet guide vane
- Patent number 12,215,624
- Issue date Feb 4, 2025
- RTX Corporation
- Simon W. Evans
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Compressor variable vane spindle mount with floating seal
- Patent number 12,196,224
- Issue date Jan 14, 2025
- RTX Corporation
- Matthew E. Bintz
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Compressor with counter-rotating blade rows
- Patent number 12,196,129
- Issue date Jan 14, 2025
- General Electric Company
- Rudolf K. Selmeier
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Levered counterweight feathering system
- Patent number 12,180,886
- Issue date Dec 31, 2024
- General Electric Company
- Nicholas M. Daggett
- F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
Information Patent Grant
Accessory gearbox for a turbine engine
- Patent number 12,173,658
- Issue date Dec 24, 2024
- General Electric Company
- Brandon Wayne Miller
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Turbine engine core and bypass flows having a defined fan-turbine r...
- Patent number 12,163,464
- Issue date Dec 10, 2024
- Rolls-Royce PLC
- Richard G Stretton
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Overall engine efficiency rating for turbomachine engines
- Patent number 12,163,478
- Issue date Dec 10, 2024
- General Electric Company
- Andrea Piazza
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Turbomachinery engines with high-speed low-pressure turbines
- Patent number 12,158,113
- Issue date Dec 3, 2024
- General Electric Company
- Pranav R. Kamat
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Turbomachinery engines with high-speed low-pressure turbines
- Patent number 12,152,537
- Issue date Nov 26, 2024
- General Electric Company
- Pranav R. Kamat
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Turbomachinery engines with high-speed low-pressure turbines
- Patent number 12,140,082
- Issue date Nov 12, 2024
- General Electric Company
- Pranav R. Kamat
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Turbomachinery engines with high-speed low-pressure turbines
- Patent number 12,123,358
- Issue date Oct 22, 2024
- General Electric Company
- Pranav R. Kamat
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Turbomachinery engines with high-speed low-pressure turbines
- Patent number 12,123,357
- Issue date Oct 22, 2024
- General Electric Company
- Pranav R. Kamat
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Compressor for an engine
- Patent number 12,123,419
- Issue date Oct 22, 2024
- MTU Aero Engines AG
- Sergio Elorza Gomez
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Combustor and gas turbine
- Patent number 12,117,175
- Issue date Oct 15, 2024
- Mitsubishi Heavy Industries, Ltd.
- Keisuke Miura
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Gas turbine engine
- Patent number 12,104,530
- Issue date Oct 1, 2024
- Rolls-Royce PLC
- Benjamin J Sellers
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Heat exchanger bypass ejector
- Patent number 12,098,676
- Issue date Sep 24, 2024
- RTX Corporation
- Malcolm P. MacDonald
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Architecture of a turbomachine with counter-rotating turbine
- Patent number 12,092,020
- Issue date Sep 17, 2024
- SAFRAN AIRCRAFT ENGINES
- Francois Gallet
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Circumferentially varying fan casing treatments for reducing fan no...
- Patent number 12,092,034
- Issue date Sep 17, 2024
- General Electric Company
- Trevor Howard Wood
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Ferrule for counter-rotating turbine impeller
- Patent number 12,085,014
- Issue date Sep 10, 2024
- SAFRAN AIRCRAFT ENGINES
- Simon Jean-Marie Bernard Cousseau
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Gas turbine engine compressor arrangement
- Patent number 12,085,025
- Issue date Sep 10, 2024
- RTX Corporation
- Karl L. Hasel
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Overall engine efficiency rating for turbomachine engines
- Patent number 12,085,026
- Issue date Sep 10, 2024
- GE AVIO S.r.L.
- Andrea Piazza
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Circumferentially varying fan casing treatments for reducing fan no...
- Patent number 12,085,023
- Issue date Sep 10, 2024
- General Electric Company
- Trevor Howard Wood
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Counter-rotating turbine
- Patent number 12,071,889
- Issue date Aug 27, 2024
- General Electric Company
- Paul Hadley Vitt
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

Patents Applicationslast 30 patents

Information Patent Application
GAS TURBINE ENGINE WITH THIRD STREAM
- Publication number 20250116243
- Publication date Apr 10, 2025
- GENERAL ELECTRIC COMPANY
- William Joseph Bowden
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
GAS TURBINE ENGINE
- Publication number 20250109854
- Publication date Apr 3, 2025
- Rolls-Royce plc
- Lloyd D MORSON
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TURBINE ENGINE INCLUDING A GAS PATH COMPONENT HAVING A HYDROPHOBIC...
- Publication number 20250092822
- Publication date Mar 20, 2025
- GENERAL ELECTRIC COMPANY
- Arthur W. Sibbach
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
DUAL BYPASS TURBOFAN GAS TURBINE ENGINE
- Publication number 20250084784
- Publication date Mar 13, 2025
- PRATT & WHITNEY CANADA CORP.
- Daniel ALECU
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TURBINE ENGINE HAVING A BLEED SYSTEM
- Publication number 20250084788
- Publication date Mar 13, 2025
- GENERAL ELECTRIC COMPANY
- Brandon W. Miller
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
CONTROL OF LEAKAGE FOR GAS TURBINE ENGINE COMPRESSOR BLADES
- Publication number 20250043799
- Publication date Feb 6, 2025
- RTX Corporation
- Luis Manuel Torres
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
REVERSE FLOW GAS TURBINE ENGINE HAVING ELECTRIC MACHINE
- Publication number 20250043719
- Publication date Feb 6, 2025
- GENERAL ELECTRIC COMPANY
- Arthur William Sibbach
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TURBINE ENGINE CORE AND BYPASS FLOWS
- Publication number 20250035037
- Publication date Jan 30, 2025
- Rolls-Royce plc
- Richard G. STRETTON
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GAS TURBINE ENGINE HAVING A HEAT EXCHANGER LOCATED IN AN ANNULAR DUCT
- Publication number 20250035038
- Publication date Jan 30, 2025
- GENERAL ELECTRIC COMPANY
- Scott Alan Schimmels
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TRIPLE-FLOW AXIAL TURBOMACHINE COMPRISING A DIVERGING HEAT EXCHANGE...
- Publication number 20250020077
- Publication date Jan 16, 2025
- SAFRAN AERO BOOSTERS SA
- David WEICKER
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Application
TRIPLE-FLOW AXIAL TURBOMACHINE COMPRISING A DIVERGING HEAT EXCHANGE...
- Publication number 20250020079
- Publication date Jan 16, 2025
- SAFRAN AERO BOOSTERS SA
- David WEICKER
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
GAS TURBINE ENGINE WITH THIRD STREAM
- Publication number 20250012235
- Publication date Jan 9, 2025
- GENERAL ELECTRIC COMPANY
- Brandon Wayne Miller
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
AIRCRAFT PROPULSION SYSTEM ENGINE WITH MULTIPLE INDEPENDENT ROTATIN...
- Publication number 20250012213
- Publication date Jan 9, 2025
- Raytheon Technologies Corporation
- Jon E. Sobanski
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
CIRCUMFERENTIALLY VARYING FAN CASING TREATMENTS FOR REDUCING FAN NO...
- Publication number 20240426247
- Publication date Dec 26, 2024
- GENERAL ELECTRIC COMPANY
- Trevor Howard Wood
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
COMPRESSOR VARIABLE VANE SPINDLE MOUNT WITH FLOATING SEAL
- Publication number 20240410393
- Publication date Dec 12, 2024
- Raytheon Technologies Corporation
- Matthew E. Bintz
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Application
TURBINE ENGINE WITH COMPOSITE AIRFOILS
- Publication number 20240410285
- Publication date Dec 12, 2024
- GENERAL ELECTRIC COMPANY
- Nicholas Joseph Kray
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GAS TURBINE ENGINE COMPRESSOR ARRANGEMENT
- Publication number 20240410320
- Publication date Dec 12, 2024
- RTX Corporation
- Karl L. Hasel
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
COMBUSTOR APPARATUS
- Publication number 20240392968
- Publication date Nov 28, 2024
- Rolls-Royce plc
- Stephen C. HARDING
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
COMBUSTOR APPARATUS
- Publication number 20240392969
- Publication date Nov 28, 2024
- Rolls-Royce plc
- Stephen C. HARDING
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
GAS TURBINE ENGINE WITH BYPASS TOBI COOLING/PURGE FLOW AND METHOD
- Publication number 20240337187
- Publication date Oct 10, 2024
- William K. Ackermann
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GAS TURBINE ENGINE WITH THIRD STREAM
- Publication number 20240318613
- Publication date Sep 26, 2024
- GENERAL ELECTRIC COMPANY
- Brandon Wayne Miller
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
HIGH-SPEED SHAFT RATING FOR TURBINE ENGINES
- Publication number 20240318614
- Publication date Sep 26, 2024
- GENERAL ELECTRIC COMPANY
- Bhaskar Nanda Mondal
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
GAS TURBINE ENGINE COMPRESSION SYSTEM WITH CORE COMPRESSOR PRESSURE...
- Publication number 20240317411
- Publication date Sep 26, 2024
- Rolls-Royce plc
- Gareth M ARMSTRONG
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
GAS TURBINE ENGINE WITH THIRD STREAM
- Publication number 20240309829
- Publication date Sep 19, 2024
- GENERAL ELECTRIC COMPANY
- Brandon Wayne Miller
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
AFT MOUNTED PUSHER FAN FOR GAS TURBINE ENGINE
- Publication number 20240295194
- Publication date Sep 5, 2024
- RTX Corporation
- Jon Erik Sobanski
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES
- Publication number 20240287940
- Publication date Aug 29, 2024
- GENERAL ELECTRIC COMPANY
- Pranav R. Kamat
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES
- Publication number 20240287941
- Publication date Aug 29, 2024
- GENERAL ELECTRIC COMPANY
- Pranav R. Kamat
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES
- Publication number 20240280057
- Publication date Aug 22, 2024
- GENERAL ELECTRIC COMPANY
- Pranav R. Kamat
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES
- Publication number 20240280058
- Publication date Aug 22, 2024
- GENERAL ELECTRIC COMPANY
- Pranav R. Kamat
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES
- Publication number 20240280056
- Publication date Aug 22, 2024
- GENERAL ELECTRIC COMPANY
- Pranav R. Kamat
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

the compressor comprising only axial stages

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Unducted propulsion system

Turbine engine including a gas path component having a hydrophobic...

Counter-rotating gas turbine engines including turbine sections wit...

Control of leakage for gas turbine engine compressor blades

Turbomachinery engines with high-speed low-pressure turbines

Partial exhaust condensation intercooling

Partial exhaust bottoming cycle

Fluidic compressor inlet guide vane

Compressor variable vane spindle mount with floating seal

Compressor with counter-rotating blade rows

Levered counterweight feathering system

Accessory gearbox for a turbine engine

Turbine engine core and bypass flows having a defined fan-turbine r...

Overall engine efficiency rating for turbomachine engines

Turbomachinery engines with high-speed low-pressure turbines

Turbomachinery engines with high-speed low-pressure turbines

Turbomachinery engines with high-speed low-pressure turbines

Turbomachinery engines with high-speed low-pressure turbines

Turbomachinery engines with high-speed low-pressure turbines

Compressor for an engine

Combustor and gas turbine

Gas turbine engine

Heat exchanger bypass ejector

Architecture of a turbomachine with counter-rotating turbine

Circumferentially varying fan casing treatments for reducing fan no...

Ferrule for counter-rotating turbine impeller

Gas turbine engine compressor arrangement

Overall engine efficiency rating for turbomachine engines

Circumferentially varying fan casing treatments for reducing fan no...

Counter-rotating turbine

Patents Applicationslast 30 patents

GAS TURBINE ENGINE WITH THIRD STREAM

GAS TURBINE ENGINE

TURBINE ENGINE INCLUDING A GAS PATH COMPONENT HAVING A HYDROPHOBIC...

DUAL BYPASS TURBOFAN GAS TURBINE ENGINE

TURBINE ENGINE HAVING A BLEED SYSTEM

CONTROL OF LEAKAGE FOR GAS TURBINE ENGINE COMPRESSOR BLADES

REVERSE FLOW GAS TURBINE ENGINE HAVING ELECTRIC MACHINE

TURBINE ENGINE CORE AND BYPASS FLOWS

GAS TURBINE ENGINE HAVING A HEAT EXCHANGER LOCATED IN AN ANNULAR DUCT

TRIPLE-FLOW AXIAL TURBOMACHINE COMPRISING A DIVERGING HEAT EXCHANGE...

TRIPLE-FLOW AXIAL TURBOMACHINE COMPRISING A DIVERGING HEAT EXCHANGE...

GAS TURBINE ENGINE WITH THIRD STREAM

AIRCRAFT PROPULSION SYSTEM ENGINE WITH MULTIPLE INDEPENDENT ROTATIN...

CIRCUMFERENTIALLY VARYING FAN CASING TREATMENTS FOR REDUCING FAN NO...

COMPRESSOR VARIABLE VANE SPINDLE MOUNT WITH FLOATING SEAL

TURBINE ENGINE WITH COMPOSITE AIRFOILS

GAS TURBINE ENGINE COMPRESSOR ARRANGEMENT

COMBUSTOR APPARATUS

COMBUSTOR APPARATUS

GAS TURBINE ENGINE WITH BYPASS TOBI COOLING/PURGE FLOW AND METHOD

GAS TURBINE ENGINE WITH THIRD STREAM

HIGH-SPEED SHAFT RATING FOR TURBINE ENGINES

GAS TURBINE ENGINE COMPRESSION SYSTEM WITH CORE COMPRESSOR PRESSURE...

GAS TURBINE ENGINE WITH THIRD STREAM

AFT MOUNTED PUSHER FAN FOR GAS TURBINE ENGINE

TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES

TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES

TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES

TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES

TURBOMACHINERY ENGINES WITH HIGH-SPEED LOW-PRESSURE TURBINES