The GEnx Commercial Aircraft Engine
The GEnx engine delivers proven performance for the Boeing 787 Dreamliner and Boeing 747-8.
The GEnx is the fastest-selling, high-thrust jet engine in GE Aviation history with more than 1,600 engines on order. In addition to powering the four-engine Boeing 747-8, the GEnx engine is also the best-selling engine for the Boeing 787 Dreamliner.
Based on proven GE90 architecture, the GEnx engine will offer up to 15% improved fuel efficiency and 15% less CO2 compared to GE’s CF6 engine. The GEnx engine represents a giant leap forward in propulsion technology, using the latest materials and design processes to reduce weight, improve performance and deliver a more fuel-efficient commercial aircraft engine.
Among the GEnx’s innovative features are a twin-annular pre-swirl (TAPS) combustor that will dramatically reduce NOx gases and larger, more efficient fan blades that will help make the GEnx the quietest commercial aircraft engine GE has ever produced. The GEnx engine is also the world's first commercial jet engine with both a front fan case and fan blades made of carbon-fiber composites.
Carbon-fiber composite fan blades
After introducing composite fan blades on the GE90 engine in 1995, GE Aviation is taking the technology to a new level with the GEnx. The carbon-fiber composite fan blades on the GEnx engine feature a new, more efficient design, a reduced blade count (from 22 to 18 fan blades) and a composite fan case for further weight reduction.
Advanced low-pressure turbine (LPT)
The GEnx low-pressure turbine (LPT) is lighter and more efficient than its predecessor and incorporates next-generation 3D aerodynamics. It also introduces Titanium Aluminide blades to stages 6 and 7, reducing engine weight by approximately 400 lbs. and contributing to increased fuel efficiency on the GEnx engine.
GEnx Engine Model Comparison
|-1B70 (787-8)||-1B74/75 (787-9)||-1B76 (787-10)||-2B67B (747-8)|
|Bypass ratio (takeoff / top-of-climb)||9.0 / 8.3||8.8 / 8.1||8.8/ 7.9||8.0/7.4|
|Overall pressure ratio (takeoff / top-of-climb)||43.8 / 53.3||46.3 / 55.4||47.4 / 58.1||44.7 / 52.4|
|Air Mass Flow (takeoff, lbs-mass/sec)||2559||2624||2658||2297|
|Fan Diameter (in)||111.1"||111.1"||111.1"||104.7”|
|Base Engine Length (in)*||184.7||184.7||184.7||169.7|
|Compressor Stages (Fan/Booster/HPC)||1/4/10||1/4/10||1/4/10||1/3/10|
|Turbine Stages (HP/LP)||2/7||2/7||2/7||2/6|
|Control||FADEC III||FADEC III||FADEC III||FADEC III|