General Electric GEnx

The General Electric GEnx (General Electric next- generation) is a modern turbofan engine, which was initially developed by General Electric in order only the aircraft manufacturer Boeing for the Boeing 787, then also for the original versions of the Airbus A350. However, Airbus stopped the development of the initial versions of the A350. Whether the GEnx is now being used in some or all versions of the now developed by Airbus, Airbus A350 XWB is still unclear. Meanwhile, however, Boeing has selected the GEnx as the exclusive engine for the Boeing 747-8. The GEnx is the General Electric CF6- replace row.

Description

The GEnx uses some proven technologies of the General Electric GE90, such as the use of composite materials. It was originally developed for the Boeing 787 and competing at this with the Rolls Royce Trent 1000th For the first time in commercial aviation, the two different engine types of the two manufacturers of a Boeing 787 at any time be replaceable, the Boeing 787 by a change of engine in a fleet integrate to be able to use each other's engine type.

Also, for the first time no bleed air systems used more of both engines, for example, to supply the air conditioning. Instead, it should take two starter / generators with 250 kVA per engine.

The versions of the GEnx for the Boeing 787 236-334 kN thrust develop and consume compared to today's engines 20 percent less fuel and are much quieter.

In addition, a variant of the GEnx was determined with 298 kN thrust as the exclusive drive for the two versions of the Boeing 747-8 Boeing. This is for the bleed air based systems, however, the 747 from bleed air.

Whether a GEnx version will be used to bleed air supply to the Airbus A350 XWB, is unclear. Although GE was the main supplier for the original Airbus A350, there is still no contract for supplies for some or all variants of the Airbus A350 XWB.

On March 19, 2006, a variant of the GEnx Bleedless generated 378 kN thrust in the first test run of the engine type. On 22 February 2007, the three-hour maiden flight took place on flying test bed ( a 747 ) from GE.

The approximately 40 built in the Block 4 status of the GEnx -1B engines reach by mid-2011 not required in terms of fuel consumption. A performance improvement Package 1 ( PIP -1), wherein the number of vanes is increased in multiple stages, this is to be improved by 1.4 %, which is only about one percent of the above requirements. The first of these improved engines to be launched in autumn 2011 on a Boeing 787 for its maiden flight. In the long term is to be reduced by a PIP 2, the fuel consumption at the specified values ​​at the same time increasing the thrust of the engine. This will be done through an additional step in the low- pressure compressor and the low pressure turbine, with larger fan blades and other changes to the engine. The modifications were first tested in December 2010 and are to be approved by June 2012.

Technologies

Although the GEnx was derived from the GE90, the GEnx uses some weight-saving innovations:

• Production of the fan blades made ​​of composites, with the leading edge of titanium
• Manufacturing of the engine casing made ​​of composite materials

The fuel consumption will reduce the following technologies:

• A by-pass ratio of 9.5:1. This also reduces the noise emissions
• One based on the GE90- 94B high pressure compressor with a compression ratio of 23:1
• Opposite wave systems N1 ( Low Pressure) and N2 (high pressure )
• Combustion chamber with improved internal air currents that reduce polluting emissions
• The Boeing 787: No more bleed air loss for the air conditioner or the like, only for the anti -ice system of the engine inlet

Maintenance costs and wear and tear are to be reduced by the following:

• Less turbine parts
• A lower internal temperature by more efficient cooling techniques
• An easier removal of the fans, including the fan casing from the rest of the engine

All of these technologies will result in a fuel savings of at least 15 percent compared to the GE CF6- 80C2B1F. A special feature is the direction of rotation of fans. In contrast to all other GE engines rotate the N1 - low pressure shaft - so the fan - left ( as seen in the direction of flight). Because of the opposition of the two waves therefore has the classic direction of large American engines, namely, seen in the direction of flight right around the N2 high pressure shaft and the core engine. The fan of the GEnx thus has a direction of rotation, as was previously seen only at Rolls -Royce large engines.

Variants

Boeing 787

Engine variants: GEnx -1B -54 ( 787-3 ), GEnx -1B -64 ( 787-8 ), GEnx -1B -70 ( 787-9 )

First ran orders for Boeing 787 with GEnx engines to slow after then the existing General Electric monopoly on the Japanese market with the appointment of Rolls- Royce engines over a billion dollars for All Nippon Airways ' Boeing 787 - models had fallen, it initially looked bad for GE, since ANA also played a trendsetter role. In the meantime, we continue to lead but again with 52 percent of the orders for 787 models with GE engines (as of September 2007). An engine certification is expected in mid-November of 2007.

Boeing 747-8

Engine variant: GEnx -2B -67

The Boeing 747-8 will be available exclusively with the GEnx engine in both the freight and passenger version. For this variant of the GEnx fan diameter of 2.82 m was reduced to 2.67 m. The pass ratio remains at 9,1:1 ( in the other variants, depending on the thrust 9.1 to 9.6:1 ). The approval of the engine was made in August 2010.

Airbus A350

Engine variant: GEnx 72A

GE initially benefited from being appointed as the main supplier for the A350 series and so won the engine orders for 105 pieces A350 ( until 17 June 2005). On 17 July 2006, however, Airbus announced a totally redesigned version of the A350 XWB, this time by Rolls Royce as the main supplier for all three versions. About the equipment with engines from GE, Airbus is still negotiating with General Electric. However, the GEnx will be the Airbus A350 -800 and may be available for the Airbus A350 -900 according to General Electric. The A350 -1000 but is unlikely to be equipped with the GEnx according to the information of General Electric as GE in the size of the A350 -1000 has an exclusive contract with Boeing for the 777- 300ER.

Specifications

The technical data are as follows:

Swell

CJ610 CJ805 • • • GE1 GE4 • • J31 J33 J35 • • • J47 J73 J79 • • • J85 J87 J97 • • • YJ93 YJ101

CF6 CF34 • • • CJ805 F101 F110 • F118 • F136 • • • YF120 F404 • F412 • F414 • GE90 • GEnx • Passport • • RM12 TF34 TF37 • • TF39

GE36 • H80 • T31 • T58 • T64 • T407 • T700/CF7

LM500 LM1600 • • • LM2500 LM6000 LMS100 • • LV100

• Turbofan engine ( turbofan )
• Engine (General Electric)