GEnx

Descripción general

The GEnx (General Electric Next-generation eXperience) es el sucesor de GE Aerospace del CF6 for the widebody market, desarrollado simultáneamente para dos aeronaves muy diferentes: the Boeing 787 Dreamliner and the Boeing 747-8. Two distinct variants — GEnx-1B for the 787 and GEnx-2B for the 747-8 — comparten un núcleo de alta presión común pero difieren significativamente en sus configuraciones de fan, compresor de baja presión y turbina para adaptarse a los requisitos de empuje y flujo de aire de cada aeronave. The GEnx delivers approximately 15% mejor consumo de combustible que el CF6-80C2 al que reemplaza, impulsada por una OPR mayor de 50:1, temperaturas de entrada de turbina elevadas, and uso extensivo de materiales compuestos en toda la estructura.

Una innovación fundamental on the GEnx is its composite fan case — la primera en un motor comercial de gran tamaño. Combined with composite fan blades (18 per engine on the GEnx-1B, 22 on the GEnx-2B), the GEnx logra una reducción de peso significativa en comparación con its CF6 predecessor. The engine also incorporates a twin-annular premixing swirler (TAPS) combustor that reduce las emisiones de NOx en aproximadamente un 50% en comparación con CAEP/6 standards, and a 5-stage low-pressure turbine using advanced airfoil profiles. The 787's la arquitectura completamente eléctrica permitió GE to eliminar el sistema de aire sangrado del motor on the GEnx-1B, simplificando el motor y mejorando la eficiencia.

Especificaciones técnicas

Variantes

The GEnx-1B family powers the 787, with thrust ratings from 53,000 lbf (GEnx-1B54) through 76,100 lbf (GEnx-1B76A). The GEnx-1B64 and -1B67 are the primary variants for the 787-8, while the -1B70/P2, -1B74, and -1B76 serve the larger 787-9 and 787-10. The no-bleed architecture of the 787 required significant GEnx-1B redesign effort compared to conventional engines. The GEnx-2B powers the 747-8 with thrust around 66,500 lbf (GEnx-2B67); unlike the -1B, the -2B retains bleed air extraction for the 747-8's conventional pneumatic systems, and uses a larger fan and different LP system. The -2B has also been selected for the 747-8F freighter variant, supporting the cargo operations of UPS and other freight carriers.

Aplicaciones en aeronaves

• Boeing 787-8: GEnx-1B64/67 (64,000–67,000 lbf) — variante de lanzamiento del Dreamliner, compitiendo con Trent 1000
• Boeing 787-9: GEnx-1B70/74/76 (70,000–76,100 lbf) — Dreamliner alargado, variante del 787 más vendida
• Boeing 787-10: GEnx-1B76A (76,100 lbf) — 787 más largo, variante de alto empuje
• Boeing 747-8I: GEnx-2B67 (66,500 lbf) — variante de pasajeros Intercontinental; also powers 747-8F freighter

Historia del desarrollo

GE launched the GEnx in 2004 junto con Boeing's 787 program announcement. The first GEnx-1B engine test ran in February 2006 at Peebles. FAA certification of the GEnx-1B was achieved in July 2011, followed by GEnx-2B certification in August 2011. All Nippon Airways operated the first GEnx-powered 787-8 revenue flight in October 2011. An early service issue emerged in 2013 when some 787 operators experienced ice crystal icing in the engine's core at high altitudes, causing power rollbacks — a condition remedied through software and hardware modifications by 2014. The GEnx-2B entered service on the 747-8F with Cargolux in October 2011, and the passenger 747-8I with Lufthansa in June 2012. By 2024, GEnx had accumulated more than 90 million flight hours and achieved shop visit intervals exceeding 25,000 hours on mature engines, comparable to the exceptional CF6 reliability record it was designed to surpass.