CFM International LEAP

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LEAP
CFM LEAP-X.jpg
Mockup of a LEAP-X
Type Turbofan
National origin France/United States
Manufacturer CFM International
First run 4 September 2013 (LEAP-1A)[1]
Major applications Airbus A320neo
Boeing 737 MAX
COMAC C919
Number built 20+
Unit cost $13,000,000 USD [2]
Developed from General Electric GEnx

The CFM International LEAP (formerly called LEAP-X) is a high-bypass turbofan engine. It is currently under development by CFM International, a 50-50 joint venture company between GE Aviation of the United States and Snecma of France. It is a modernized replacement for the successful CFM International CFM56, intended to compete with the Pratt & Whitney PW1000G in the single-aisle jetliner market.

Design and development

The LEAP ("Leading Edge Aviation Propulsion")[3] incorporates technologies that CFM developed as part of the LEAP56 technology acquisition program, which CFM launched in 2005.[4] The engine was officially launched as "LEAP-X" on 13 July 2008.[5] It is intended to be a successor to the CFM56-5B and CFM56-7B. The LEAP's basic architecture includes a scaled-up version of Safran's low pressure turbine used on the GEnX engine. The fan has flexible blades manufactured by a resin transfer molding process, which are designed to untwist as the fan's rotational speed increases. While the LEAP is designed to operate at a higher pressure than the CFM-56 (which is partly why it is more efficient), GE plans to set the operating pressure lower than the maximum in order to maximize the engine's service life and reliability. Currently proposed for the LEAP is a greater use of composite materials, a blisk fan in the compressor, a second-generation Twin Annular Pre Swirl (TAPS II) combustor, and a bypass ratio around 10-11:1. GE is using ceramic matrix composites (CMC) to build the turbine shrouds.[6] These technological advances are projected to produce 16% lower fuel consumption.[5][7][8] Reliability is also supported by use of an eductor-based oil cooling system similar to that of the GenX, featuring coolers mounted on the inner lining of the fan duct. According to Aviation Week's article, "The eductor device produces a venturi effect, which ensures a positive pressure to keep oil in the lower internal sump."[9] The engine has some of the first FAA-approved 3D-printed components.[10][11]

In total, 28 test engines will be used by CFM to achieve engine certification, and 32 others will be used by Airbus, Boeing and COMAC for aircraft certification and test programs.[1][12] The first engine entering the test program successfully reached and sustained 33,000 lbf (150 kN) of thrust, required to satisfy the highest rating for the Airbus A321. The same engine ultimately reached 35,000 lbf (160 kN) of thrust in test runs.[13] General Electric carried out the first test flight, of a LEAP-1C, in Victorville, California, with the engine mounted on the company's Boeing 747 flying testbed, on October 6, 2014, The C version features a thrust reverser equipped with a one piece O-ring replacing a 2 piece door. The thrust reverser is deployed by the O-ring sliding aft, reducing the drag that was induced by the older design and improving efficiency.[14]

In April 2015, it was reported that the LEAP-1B was suffering up to a 5% shortfall on its promised reduction in fuel consumption.[15]

Orders

The LEAP engine has attracted more than 5,000 orders and GE plans to produce 1,700 engines by the end of 2018.[9] The Commercial Aircraft Corporation of China (COMAC) has chosen the LEAP engine for its new COMAC C919 aircraft.[16]

The company expects to receive certification for the first LEAP, the LEAP-1C, for China's 150-seat COMAC C919 twinjet. The aircraft is due to begin testing in 2016.[17] The engine will also be deployed in the same year on the new Airbus A320neo variant.[18]

On July 20, 2011, American Airlines announced that it planned to purchase 100 Boeing 737 aircraft featuring the LEAP-1B engine.[19] The project was approved by Boeing on August 30, 2011 as the Boeing 737 MAX.[20][21] Southwest Airlines is the launch customer of the 737 MAX with a firm order of 150 aircraft.[22]

CFM International offers its support for the engine, and signed a 15-year Rate per Flight Hour agreement with Loong Air for 20 LEAP-1A at U.S $333 million, or $3039 per engine per day, in contrast with U.S. $138 million for 17 CFM International CFM56 over 12 years or $1852 per engine per day.[23] As a number of A320neo engine for ANA group of Japan was also ordered in 2014, there is a possibility to select the LEAP engine.[24]

Applications

Airbus A320neo prototype with Leap engines.

Specifications

Data from CFM International

General characteristics

  • Type: Twin-spool, high bypass turbofan
  • Length:
  • Diameter: 1.75 - 1.98 m
  • Dry weight:

Components

  • Compressor: Single-stage fan, 3-stage low pressure compressor, 10-stage high pressure compressor[8]
  • Combustors: annular
  • Turbine: Two-stage high pressure turbine, 7-stage (737 MAX: 5-stage) low pressure turbine

Performance

Model LEAP-1A LEAP-1B LEAP-1C
Fan diameter [25] Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).
Bypass ratio (BPR) [25] 11:1 9:1 11:1
Overall pressure ratio (OPR) [25] 40:1 40:1 40:1
Thrust [26] 24,500–32,900 lbf (109–146 kN) 23,000–28,000 lbf (100–120 kN) 27,980–30,000 lbf (124.5–133.4 kN)
Fuel burn (vs. current CFM56-7BE engine) [27] ~ -15% ~ -15% ~ -15%
Stage count [28] 1-3-10-2-7 1-3-10-2-5 1-3-10-2-7
Application [29] Airbus A320neo family Boeing 737 MAX family COMAC C919
Entry into service [29] 2016 2017 2018

See also

Related development
Comparable engines
Related lists

References

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ LEAP Turbofan Engine, History
  4. ↑ CFM Laying the Technology Foundation for the Future. CFM International
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Norris, Guy, Hot blades, Aviation Week & Space Technology, April 27-May 10, 2015, p.55
  7. ↑ New engines: flurry of activity despite downturn
  8. ↑ 8.0 8.1 LEAP-X: Redefining Turbofan Engines for Narrowbody Aircraft
  9. ↑ 9.0 9.1 Norris, Guy, Pressure testing, Aviation Week and Space Technology, October 28, 2013, p. 43
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ GE
  12. ↑ http://www.flightglobal.com/news/articles/first-leap-powered-a320neo-moved-to-flight-test-team-411466/
  13. ↑ Norris, Guy, Pressure testing, Aviation Week and Space Technology, October 28, 2013, pp.42-43
  14. ↑ Norris, Guy, Boom time, Aviation Week & Space Technology, October 13, 2014, p.40
  15. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ CFM International to provide engines for COMAC's C919
  17. ↑ CFM to finish Leap core testing by mid-May
  18. ↑ Airbus A320neo story FlightGlobal
  19. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  20. ↑ Boeing Confirms Duopoly With Airbus Announcing Re-Engining Of 737. Forbes
  21. ↑ Boeing rendering illustrates major changes to 737NE. flightglobal.com
  22. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  23. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  24. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  25. ↑ 25.0 25.1 25.2 Lua error in package.lua at line 80: module 'strict' not found.
  26. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  27. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  28. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  29. ↑ 29.0 29.1 Lua error in package.lua at line 80: module 'strict' not found.

External links

it:CFM International CFM56#CFM International LEAP

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