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GEnx Overview | GEnx Engine Family | Commercial Jet Engines | GE Aviation
GEnx Overview | GEnx Engine Family | Commercial Jet Engines | GE Aviation
Published: 2011/10/31
Channel: GE Aviation
GEnx-1B vs. GE90-115B
GEnx-1B vs. GE90-115B
Published: 2017/01/17
Channel: Dj's Aviation
The GEnx Jet Engine | GE Aviation
The GEnx Jet Engine | GE Aviation
Published: 2015/10/01
Channel: GE Aviation
GEnx Theatre | Introduction to the GEnx Commercial Jet Engine | GE Aviation
GEnx Theatre | Introduction to the GEnx Commercial Jet Engine | GE Aviation
Published: 2012/01/30
Channel: GE Aviation
GEnx -2B | Boeing 747-8 Aircraft Engine | GE Aviation
GEnx -2B | Boeing 747-8 Aircraft Engine | GE Aviation
Published: 2010/04/19
Channel: GE Aviation
GEnx-2b engine on the GE test Boeing 747
GEnx-2b engine on the GE test Boeing 747
Published: 2009/12/16
Channel: wa22030
GEnx - Fuel Nozzle Bolt removal - GE Aviation Maintenance Minute
GEnx - Fuel Nozzle Bolt removal - GE Aviation Maintenance Minute
Published: 2017/07/10
Channel: GE Aviation
GE
GE's Big Bet on Goliath Engines
Published: 2013/11/14
Channel: GE Aviation
GEnx ROAR!! AIR FRANCE BOEING 787-9 Start Up and Take Off from Paris CDG
GEnx ROAR!! AIR FRANCE BOEING 787-9 Start Up and Take Off from Paris CDG
Published: 2017/06/16
Channel: Fernousdu972 HD Aviation
See inside the GE9X, GE
See inside the GE9X, GE's newest game-changer
Published: 2014/07/13
Channel: GE Aviation
GEnx | Weather Proof | Aircraft Engine Testing
GEnx | Weather Proof | Aircraft Engine Testing
Published: 2010/04/19
Channel: GE Aviation
GEnx & GE90 | Big Brother & Little Brother
GEnx & GE90 | Big Brother & Little Brother
Published: 2010/04/19
Channel: GE Aviation
Montagem da Turbina GEnx - GE do Brasil
Montagem da Turbina GEnx - GE do Brasil
Published: 2012/09/13
Channel: GE do Brasil
Firing Up the First GE9X Engine | GE Aviation
Firing Up the First GE9X Engine | GE Aviation
Published: 2016/04/11
Channel: GE Aviation
Genx VS. Trent 1000
Genx VS. Trent 1000
Published: 2010/09/10
Channel: ivanchiang827
United 787-9 GEnx BusinessFirst Takeoff NRT-LAX - Great Engine Noise, Wing Flex and Condensation!
United 787-9 GEnx BusinessFirst Takeoff NRT-LAX - Great Engine Noise, Wing Flex and Condensation!
Published: 2015/09/17
Channel: Clay Sollers
{TrueSound}™ GEnx vs. CF6 Takeoff Sound Comparison! Boeing 747 Showdown!
{TrueSound}™ GEnx vs. CF6 Takeoff Sound Comparison! Boeing 747 Showdown!
Published: 2016/04/26
Channel: Horizon Productions SFL
GEnx-2B Training - GE CTEC
GEnx-2B Training - GE CTEC
Published: 2017/03/28
Channel: UPS Airlines
Boeing 787 GenX engine up close!
Boeing 787 GenX engine up close!
Published: 2015/08/18
Channel: Turbine Sound Studios
How a jet engine works
How a jet engine works
Published: 2012/02/23
Channel: oisiaa
GE90 and GEnx Composite fan blades
GE90 and GEnx Composite fan blades
Published: 2012/12/06
Channel: GE Aviation
GE GEnx-1B 3D Printed B787 Jet Engine Model with Thrust Reverser
GE GEnx-1B 3D Printed B787 Jet Engine Model with Thrust Reverser
Published: 2015/06/07
Channel: Punk Rocker
First Boeing 787 with GE GEnx engines
First Boeing 787 with GE GEnx engines
Published: 2010/06/17
Channel: andyh246
GEnx - Oil Servicing - GE Aviation Maintenance Minute
GEnx - Oil Servicing - GE Aviation Maintenance Minute
Published: 2016/04/14
Channel: GE Aviation
Turbofan GENX General Electric
Turbofan GENX General Electric
Published: 2015/12/02
Channel: Alessandro Chessa
GE-90 VS Trent 800 !!! British Airways 777-200 Epic Showdown @ St. Kitts
GE-90 VS Trent 800 !!! British Airways 777-200 Epic Showdown @ St. Kitts
Published: 2015/06/21
Channel: SKBenergy
Testing The GE9X Jet Engine, the World’s Largest Jet Engine
Testing The GE9X Jet Engine, the World’s Largest Jet Engine
Published: 2015/06/16
Channel: GE Reports
GEnx - Boroscope Plug Installation - GE Aviation Maintenance Minute
GEnx - Boroscope Plug Installation - GE Aviation Maintenance Minute
Published: 2016/11/15
Channel: GE Aviation
BOEING 747-8 ENGINE (GEnx engine)
BOEING 747-8 ENGINE (GEnx engine)
Published: 2014/12/05
Channel: Fady Sarofiem
Testing the GEnx engine to ensure safety.
Testing the GEnx engine to ensure safety.
Published: 2011/11/04
Channel: thegeshowchannel
GEnx - Fan Blade Platform Installation - GE Aviation Maintenance Minute
GEnx - Fan Blade Platform Installation - GE Aviation Maintenance Minute
Published: 2016/09/12
Channel: GE Aviation
General Electric GEnx
General Electric GEnx
Published: 2014/10/04
Channel: Universidad Aeronáutica UNAQ
TAPS Combustor Technology | GEnx Jet Engine | GE Aviation
TAPS Combustor Technology | GEnx Jet Engine | GE Aviation
Published: 2010/04/19
Channel: GE Aviation
GEnx-1B - VFSG Alignment Tool - GE Aviation Maintenance Minute
GEnx-1B - VFSG Alignment Tool - GE Aviation Maintenance Minute
Published: 2016/09/08
Channel: GE Aviation
GEnx: the Next Generation of Commercial Jet Engines
GEnx: the Next Generation of Commercial Jet Engines
Published: 2008/10/23
Channel: GE Reports
GE Aviation and the Ceramic Matrix Composite Revolution
GE Aviation and the Ceramic Matrix Composite Revolution
Published: 2015/10/29
Channel: GE Aviation
360 Degree General Electric GEnx Engine 360Fly 4K
360 Degree General Electric GEnx Engine 360Fly 4K
Published: 2016/07/12
Channel: AIRBOYD
GE Aviation | 747 Test Aircraft | GEnx Testing | Jet Engine
GE Aviation | 747 Test Aircraft | GEnx Testing | Jet Engine
Published: 2009/04/29
Channel: GE Reports
The New GE9X Engine - GE Aviation
The New GE9X Engine - GE Aviation
Published: 2013/06/17
Channel: GE Aviation
GEnx Production | Two Minute Engine
GEnx Production | Two Minute Engine
Published: 2010/04/19
Channel: GE Aviation
Fantastic Business Class HD Boeing 787 Dreamliner Takeoff From Frankfurt On Qatar Airways!!!
Fantastic Business Class HD Boeing 787 Dreamliner Takeoff From Frankfurt On Qatar Airways!!!
Published: 2014/05/27
Channel: Mah584jr HD Aviation
Inside Innovation / GE
Inside Innovation / GE's GEnx: A Leaner, Cleaner Jet Engine
Published: 2011/10/06
Channel: GE Reports
GEnx Engine | Japan Airlines 787 First Flight | Customer Stories | GE Aviation
GEnx Engine | Japan Airlines 787 First Flight | Customer Stories | GE Aviation
Published: 2012/06/22
Channel: GE Aviation
747-8 GEnx Power So Quite Amazing!
747-8 GEnx Power So Quite Amazing!
Published: 2012/06/12
Channel: Airlineatlas
The Ultimate 777 Engine Comparison Video!!!  Choose Your Favorite!!!
The Ultimate 777 Engine Comparison Video!!! Choose Your Favorite!!!
Published: 2014/12/05
Channel: Mah584jr HD Aviation
Jet Engine Life Span | GEnx & GE90
Jet Engine Life Span | GEnx & GE90
Published: 2010/04/19
Channel: GE Aviation
GEnx™ Engine
GEnx™ Engine
Published: 2011/09/19
Channel: aptechnology4595
Boeing 747 8F   General Electric GEnx
Boeing 747 8F General Electric GEnx
Published: 2017/04/07
Channel: Sergio Mazzi
GEnx - Delivering Performance
GEnx - Delivering Performance
Published: 2014/06/30
Channel: GE Aviation
General Electric GEnx
General Electric GEnx
Published: 2014/11/17
Channel: Audiopedia
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WIKIPEDIA ARTICLE

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GEnx
Salon du Bourget 20090619 254.jpg
General Electric GEnx at the Paris Air Show 2009
Type Turbofan
Manufacturer GE Aviation
First run 2006
Major applications Boeing 747-8
Boeing 787 Dreamliner
Unit cost 787-8 GEnx-1B: $25.6 million[1]
787-9 GEnx-1B: $28.7 million[2]
747-8 GEnx-2B: $22.5 million[3]
Developed from General Electric GE90

The General Electric GEnx (General Electric Next-generation) is an advanced dual rotor, axial flow, high-bypass turbofan jet engine in production by GE Aviation for the Boeing 787 and 747-8. The GEnx is intended to replace the CF6 in GE's product line.

Development[edit]

GEnx on 747-8I prototype

The GEnx and the Rolls-Royce Trent 1000 were selected by Boeing following a run-off between the three big engine manufacturers. The GEnx uses some technology from the GE90 turbofan, including composite fan blades, and the smaller core featured in earlier variants of the engine. The engine carries composite technology into the fan case.

Both engine types will have a standard interface with the aircraft, allowing any Boeing 787 to be fitted with either GE or RR engines at any time.[4][5] The engine market for the 787 is estimated at US$40 billion over the next 25 years. A first is the elimination of bleed air systems using high temperature/high pressure air from the propulsion engines to power aircraft systems such as the starting, air-conditioning and anti-ice systems. Both engines enable the move towards the More Electric Aircraft, that is, the concept of replacing previously hydraulic and pneumatic systems with electrical ones to reduce weight, increase efficiency, and reduce maintenance requirements.

The GEnx was expected to produce thrust from 53,000 to 75,000 lbf (240 to 330 kN) with first tests commencing in 2006 and service entry by 2008 (delayed by 787 deliveries). Boeing predicts reduced fuel consumption of up to 20% and significantly quieter engines than current turbofans. A 66,500 lbf (296 kN) thrust version (GEnx-2B67) will be used on the 747-8. Unlike the initial version, for the 787, this version has a traditional bleed air system to power internal pneumatic and ventilation systems. It will also have a smaller overall diameter than the initial model to accommodate installation on the 747.

General Electric began initial test runs of the bleedless GEnx variant on 19 March 2006.[6] The first flight with one of these engines took place on 22 February 2007, using a Boeing 747-100, fitted with one GEnx engine in the number 2 (inboard left hand side) position.

Operational history[edit]

Introduced in late 2011 on a 747-8 freighter, Cargolux surpassed one million flight hours in early 2017.[7] In the summer of 2012, three engines suffered Low Pressure Turbine (LPT) failures. One failure was caused by an assembly problem, which led to inspections of all other engines then in service.[8]

During the spring and summer of 2013, GE learned of four 747-8F freighters that suffered icing in their engines at altitudes of 40,000 feet and above. The most serious incident involved an AirBridge Cargo freighter; on July 31, while at an altitude of 41,000 feet over China, the flight crew noted two engines surging while a third lost substantial power. The pilots were able to land the plane safely but the engines were found to have sustained damage. Among the possible factors cited was "'unique convective weather systems' such as unusually large thunderstorms reaching high altitudes." Boeing is working with GE on software solutions to the problem.[9] Altitude was restricted until GE changed the software to detect the high-altitude ice crystals and opens bleed air valve doors to eject them before they enter the core.[7]

In January 2016 a Japan Airlines 787 had an inflight shutdown after flying through icing conditions, caused by ice formed on fan blades and ingested: the blades moved forward slightly and rubbed on the abradable seal in the casing.[7] In March 2016, the US FAA ordered emergency fixes on the GEnX-1B PIP2.[10] The airworthiness directive affects 43 Boeing 787 Dreamliners in the US.[11] Abradable material in the casing in front of the fan blades was ground to keep them from rubbing when ingesting ice or debris on 330 GEnx PIP-2.[7]

Design[edit]

Fan blades and inlet guide vanes of GEnx-2B
Detail of GEnx core

The GEnx is derived from the GE90, but features a number of weight-saving features:

  • Fan diameter of 111 in (2.8 m) for the 787-8 and 105 in (2.7 m) for the 747-8.
  • Composite fan blades with steel alloy leading edges.
  • Fan case of composite material which reduces weight and thermal expansion.
  • Titanium aluminide stage 6 and 7 low-pressure turbine blades.

Fuel burn reduction technologies include:

  • Fan bypass ratio of 9.6:1, which also helps reduce noise.
  • High-pressure compressor based on GE90-94B, with 23:1 pressure ratio and only 10 stages. Also, shrouded guide vanes reduce secondary flows.
  • Counter-rotating spools for the reaction turbines to reduce load on guide vanes.
  • Lean TAPS (twin annular premixed swirler) combustor to reduce environmentally-harmful emissions with improved airflow to prevent the flame to flash back.[12]

Among features to reduce maintenance cost and increase engine life are:

  • Spools with lower parts count achieved by using blisks in some stages and low blade counts in other stages and by using a low number of stages.
  • Internal engine temperatures reduced by using more efficient cooling techniques.
  • Debris extraction within the low-pressure compressor guards high-pressure compressor.

All of these yield a fuel burn said to be 15% better than GE's CF6-80C2 engines for widebody aircraft.

Applications[edit]

Specifications[edit]

Rear view of a GEnx-1B on a Jetstar 787-8, showing noise-reducing chevrons
Data sheet[13]
Variant -1B70 -1B74/75 -1B76 -2B67B
Application 787-8 787-9 787-10 747-8
Fan Diameter 111.1 in (2,822 mm) 104.7 in (2,659 mm)
Compressor 1 Fan 4 LP 10 HP 1 Fan 3 LP 10 HP
Turbine 2 HP 7 LP 2 HP 6 LP
Takeoff thrust 69,800 lbf (310 kN) 74,100 lbf (330 kN) 76,100 lbf (339 kN) 66,500 lbf (296 kN)
Takeoff Bypass ratio 9.0 8.8 8.8 8.0
Top-of-climb OPR 53.3 55.4 58.1 52.4
Takeoff air per sec. 2,559 lb (1,161 kg) 2,624 lb (1,190 kg) 2,658 lb (1,206 kg) 2,297 lb (1,042 kg)
Flange to flange 184.7 in (4,691 mm) 169.7 in (4,310 mm)
Nominal RPM[14] LP 2,560, HP 11,377 LP 2,835, HP 11,377
Dry weight[14] 13,552 lb (6,147 kg) 12,397 lb (5,623 kg)
Thrust/weight 5.15 5.47 5.62 5.36

See also[edit]

Related development
Comparable engines
Related lists

References[edit]

  1. ^ "Uzbekistan Airways Selects GEnx engines for Boeing 787 Dreamliners" (Press release). GE Aviation. September 20, 2017. 
  2. ^ "China Eastern Selects GEnx Engine to Power Its Boeing 787 Dreamliners" (Press release). GE Aviation. June 19, 2017. 
  3. ^ "Volga-Dnepr Group Signs MOU for Additional GEnx-Powered Boeing 747-8 Aircraft" (Press release). GE Aviation. June 17, 2015. 
  4. ^ "Boeing 787 Aircraft Facts, Dates and History". Flightlevel350.com. Archived from the original on 2013-01-19. Retrieved 2013-05-09. 
  5. ^ "Boeing 787 Dreamliner Long-Range, Mid-Size Airliner". Aerospace Technology. Retrieved 2013-05-09. [unreliable source?]
  6. ^ "General Electric Performs First Run of New GEnx Engine." Flight International. 21 March 2006.
  7. ^ a b c d Sean Broderick (Aug 31, 2017). "Issues With Newest Engines Provide Early MRO-Proving Opportunities". Aviation Week Network. 
  8. ^ "GE identifies installation issue in GEnx, orders inspections". Flightglobal. Retrieved 6 October 2012. 
  9. ^ Pasztor, Andy (October 16, 2013). "Icing Hazards Surface on Boeing's Newest 747 Jet". Wall Street Journal. p. B3. Retrieved June 10, 2014. 
  10. ^ "FAA orders engine icing fixes for GEnx-powered Boeing 787 Dreamliners". Aviation Safety Network. 2016-04-23. 
  11. ^ Patterson, Thom (April 23, 2016). "FAA Orders Urgent Fixes For Boeing 787 Dreamliners". CNN. 
  12. ^ General Electric (June 2013). "TAPS II Combustor Final Report" (PDF). Continuous Lower Energy, Emissions and Noise (CLEEN) Program. FAA. 
  13. ^ "GENX high bypass turbofan engines" (PDF). GE Avaition. 11 Jan 2017. 
  14. ^ a b "Type certificate data sheet number E00078NE, Revision: 14" (PDF). FAA. June 20, 2016. 

External links[edit]

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