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General Electric CF34
High bypass turbofan aircraft engine
High bypass turbofan aircraft engine
| Field | Value |
|---|---|
| name | CF34 |
| image | File:Canadair CL-600-2B19 Regional Jet CRJ-200LR, UTair Aviation AN2213397.jpg |
| caption | A CF34 installed on a Bombardier CRJ200 |
| engine_type | Turbofan |
| national_origin | United States |
| manufacturer | GE Aviation |
| first_run | 1982 |
| major_applications | Bombardier CRJ |
| Comac C909 | |
| Embraer E-Jets | |
| developed_from | General Electric TF34 |
| developed_into | General Electric Passport |
Comac C909 Embraer E-Jets
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.
Design 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 18500 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.
GE had proposed updating the Boeing B-52 Stratofortress with CF34-10 engines, but the Rolls-Royce F130 was selected in September 2021 instead.
Applications
;CF34-1A
- Bombardier Challenger 601-1A ;CF34-3A
- Bombardier Challenger 601-3A/3R
- Bombardier CRJ100 ;CF34-3B
- Bombardier Challenger 604
- Bombardier Challenger 605
- Bombardier Challenger 650
- Bombardier Challenger 850
- Bombardier CRJ200
- Bombardier CRJ440 ;CF34-8C
- Bombardier CRJ550
- Bombardier CRJ700
- Bombardier CRJ705
- Bombardier CRJ900
- Bombardier CRJ1000 ;CF34-8E
- Embraer 170
- Embraer 175 ;CF34-10A
- Comac C909 ;CF34-10E
- Embraer 190
- Embraer 195
- Embraer Lineage 1000
Specifications
| CF34-3 | CF34-8C | CF34-8E | CF34-10A | CF34-10E | Application | Length | Diameter | Dry weight | Fan | Compressor | Turbine | Thrust (SL) | Thrust/weight | OPR (max. power) | Bypass ratio | SFC (Cruise) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CL600/CRJ200 | CRJ700/900/1000 | E170/175 | C909 | E190/195 | ||||||||||||
| 103 in | 128 in | 121 in | 90 in | 145 in | ||||||||||||
| 49 in | 52 in | 53 in | 57 in | 57 in | ||||||||||||
| 1670 lb | 2400 - | 2600 lb | 3700 lb | 3700 lb | ||||||||||||
| 44 in | 46.2 in | 53 in | ||||||||||||||
| 14 HP stages, 14:1 | 10 HP stages | 3 LP + 9 HP stages | ||||||||||||||
| 4 LP + 2 HP stages | 4 LP + 1 HP stage | |||||||||||||||
| 9220 lbf | 13790 - | 14500 lbf | 17640 lbf | 20360 lbf | ||||||||||||
| 5.52:1 | 5.7-6:1 | 5.6:1 | 5.1:1 | 5.2:1 | ||||||||||||
| 21:1 | 28-28.5:1 | 28.5:1 | 29:1 | |||||||||||||
| 6.2:1 | 5:1 | 5.4:1 | ||||||||||||||
| 0.69 lb/lbf/h | 0.67 - | 0.68 lb/lbf/h | 0.65 lb/lbf/h | 0.64 lb/lbf/h |
References
References
- [http://www.flightglobal.com/directory/searchresults.aspx?navigationItemId=382&manufacturerType=Engine&searchMode=manufacturer&Keyword=&Manufacturer=3150 GE Aviation] at flightglobal.com
- [http://www.aviationpros.com/article/10781818/turbine-technology-the-cf34-turns-20 The CF34] {{Webarchive. link. (2022-05-29 at aviationpros.com)
- [http://www.aviationpros.com/press_release/10782919/ges-cf34-3-engines-celebrate-20-years-of-regional-jet-service GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service] {{Webarchive. link. (2022-05-29 at aviationpros.com)
- https://www.geaerospace.com/commercial/aircraft-engines/cf34
- (October 29, 2018). "E190 Values Start to Take Note of E2". Aircraft Value News.
- David Hughes. (Feb 13, 1995). "CF34-8C to power new regional jet".
- "Propulsion Hub & Engine Product | GE Aviation".
- "Rolls-Royce North America selected to power the B-52 Commercial Engine Replacement Program".
- "The CF34 Engine". GE Aviation.
- "CF34-3 turbofan engine". GE Aviation.
- "CF34-8C turbofan engine". GE Aviation.
- "CF34-8E turbofan engine". GE Aviation.
- "CF34-10A turbofan engine". GE Aviation.
- "CF34-10E turbofan engine". GE Aviation.
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