General Electric CF34
High bypass turbofan aircraft engine
The General Electric CF34 is a civilian high-bypass turbofan developed by GE Aviation from its TF34 military engine. The CF34 is used on a number of business and regional jets, including the Bombardier CRJ series, the Embraer E-Jets, and Comac ARJ21/C909. There are 7,500 engines in service.
01Design and development
The original engine contained a single stage fan driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage high pressure (HP) compressor driven by a 2-stage HP turbine, with an annular combustor. Later higher thrust versions of the CF34 feature an advanced technology core, with only 10 HP compressor stages. Latest variants, the -10A and -10E, were derived from the CFM56 engine family, and have a radically different HP spool, containing a 9-stage compressor driven by a single stage turbine. The LP spool has 3 core booster stages behind the fan. Static thrust is 82 kilonewtons (18,500 lbf) for the -10E variant.
On wing times can reach 14,000 hours, an overhaul costs over $1.5 million and a set of LLPs $2.1 million for a 25,000 cycle life. In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.
In a 2020 solicitation by the US Air Force called the B-52 Commercial Engine Replacement Program, GE had proposed updating the Boeing B-52 Stratofortress with CF34-10 engines. In September 2021, the Rolls-Royce F130 was selected instead of the GE proposal.
02Applications
CF34-1A
CF34-3
CF34-3A
CF34-3B
- Bombardier Challenger 604
- Bombardier Challenger 605
- Bombardier Challenger 650
- Bombardier Challenger 850
- Bombardier CRJ200
- Bombardier CRJ440
CF34-8
CF34-8C
CF34-8E
CF34-10
CF34-10A
CF34-10E
03Specifications
| CF34-3 | CF34-8C | CF34-8E | CF34-10A | CF34-10E | |
|---|---|---|---|---|---|
| Application | CL600/CRJ200 | CRJ700/900/1000 | E170/175 | C909 | E190/195 |
| Length | 103 in (2.6 m) | 128 in (3.3 m) | 121 in (3.1 m) | 90 in (2.3 m) | 145 in (3.7 m) |
| Diameter | 49 in (1.2 m) | 52 in (1.3 m) | 53 in (1.3 m) | 57 in (1.4 m) | |
| Dry weight | 1,670 lb (760 kg) |
2,400-2,450 lb (1,090-1,110 kg) |
2,600 lb (1,200 kg) |
3,700 lb (1,700 kg) | |
| Fan | 44 in (110 cm) | 46.2 in (117 cm) | 53 in (130 cm) | ||
| Compressor | 14 HP stages, 14:1 | 10 HP stages | 3 LP + 9 HP stages | ||
| Turbine | 4 LP + 2 HP stages | 4 LP + 1 HP stage | |||
| Thrust (SL) | 9,220 lbf (41.0 kN) | 13,790-14,500 lbf (61.3-64.5 kN) | 14,500 lbf (64 kN) | 17,640 lbf (78.5 kN) | 20,360 lbf (90.6 kN) |
| Thrust/weight | 5.52:1 | 5.7-6:1 | 5.6:1 | 5.1:1 | 5.2:1 |
| OPR (max. power) | 21:1 | 28-28.5:1 | 28.5:1 | 29:1 | |
| Bypass ratio | 6.2:1 | 5:1 | 5.4:1 | ||
| SFC (Cruise) | 0.69 lb/lbf/h (20 g/kN/s) |
0.67-0.68 lb/lbf/h (19-19 g/kN/s) |
0.68 lb/lbf/h (19 g/kN/s) |
0.65 lb/lbf/h (18 g/kN/s) |
0.64 lb/lbf/h (18 g/kN/s) |
Sources and credits
This article is adapted from the Wikipedia article “General Electric CF34”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Canadair CL-600-2B19 Regional Jet CRJ-200LR, UTair Aviation AN2213397.jpg by Gleb Osokin - Russian AviaPhoto Team, CC BY-SA 3.0
- E-190 az motore.JPG by Stefano.nicolucci, CC BY-SA 3.0
- KLC E-190 PH-EXA 25sep14 LFBO-3.jpg by Gyrostat, CC BY-SA 4.0
- EI-HSA CRJ900 SAS CF34-8C5 ARN 01.jpg by Bene Riobó, CC BY-SA 4.0
- China ARJ-21.jpg by Peng Chen, CC BY-SA 2.0
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