General Electric CF34
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| CF34 | |
|---|---|
| |
| A CF34 installed on a Bombardier CRJ200 | |
| Type | Turbofan |
| National origin | United States |
| Manufacturer | General Electric |
| First run | 1982[1] |
| Major applications | Bombardier Challenger 601/604/605 Bombardier Challenger 850 Bombardier CRJ Comac ARJ21 Embraer E-Jets |
| Developed from | General Electric TF34 |
The General Electric CF34 is a civilian high-bypass turbofan developed by GE Aircraft Engines 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 the Chinese ARJ21.[2][3] In 2012, there were 5,600 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 HP compressor driven by a 2-stage high pressure (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,[citation needed] 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.[4] In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.[5]
GE has proposed updating the Boeing B-52 Stratofortress with CF34-10 engines.[6]
Applications[]
- CF34-1A
- CF34-3A
- CF34-3A1
- Bombardier Challenger 601-3R
- Bombardier CRJ100 ER/LR
- CF34-3A2
- CF34-3B
- Bombardier Challenger 604
- Bombardier Challenger 605
- CF34-3B1
- Bombardier Challenger 850
- Bombardier CRJ200 ER/LR
- Bombardier CRJ440 ER/LR
- CF34-8C1
- Bombardier CRJ700 (Series 701)
- CF34-8C5
- Bombardier CRJ700 (Series 705)
- Bombardier CRJ900
- Bombardier CRJ900 NextGen
- CF34-8C5A1
- Bombardier CRJ1000 NextGen
- CF34-8C5A2
- Bombardier CRJ1000 NextGen
- CF34-8C5B1
- Bombardier CRJ700 NextGen
- CF34-8E
- Embraer E-170
- Embraer E-175
- CF34-10A
- CF34-10E
- Embraer E-190
- Embraer E-195
- Embraer Lineage 1000
Specifications[]
| CF34-3[8] | CF34-8C[9] | CF34-8E[10] | CF34-10A[11] | CF34-10E[12] | |
|---|---|---|---|---|---|
| Application | CL600/CL850 CRJ200 |
Bombardier CRJ700/900/1000 | E-170/175 | Comac ARJ21 | E-190/195 Lineage 1000 |
| 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) | 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) | 3,700 lb (1,700 kg) |
| Compressor | 1 44 in (110 cm) fan 14 HP stages, 14:1 |
1 46.2 in (117 cm) fan 10 HP stages |
1 53 in (130 cm) fan + 3 LP stages 9 HP stages | ||
| Turbine | 4 LP stages 2 HP stages |
4 LP stages 1 HP stage | |||
| Thrust at sea level |
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-to-weight ratio | 5.52:1 | 5.7-6:1 | 5.6:1 | 5.1:1 | 5.2:1 |
| Overall pressure ratio at max. power |
21:1 | 28-28.5:1 | 28.5:1 | 29:1 | |
| Bypass ratio | 6.2:1 | 5:1 | 5.4:1 | ||
| Cruise SFC | 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) |
See also[]
Related development
Comparable engines
- PowerJet SaM146
- Progress D-436
- Pratt & Whitney PW6000
- IAE V2500
- Rolls-Royce AE 3007
- Rolls-Royce BR700
- Rolls-Royce RB.183 Tay
Related lists
References[]
- ^ GE Aviation at flightglobal.com
- ^ The CF34 at aviationpros.com
- ^ GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com
- ^ "E190 Values Start to Take Note of E2". Aircraft Value News. October 29, 2018.
- ^ David Hughes (Feb 13, 1995). "CF34-8C to power new regional jet". Aviation Week.
- ^ ((cite website |url=https://www.geaviation.com/military/engines/b-52%7Cretreived= Jun 25,2020}}
- ^ "The CF34 Engine". GE Aviation.
- ^ "CF34-3 turbofan engine" (PDF). GE Aviation.
- ^ "CF34-8C turbofan engine" (PDF). GE Aviation.
- ^ "CF34-8E turbofan engine" (PDF). GE Aviation.
- ^ "CF34-10A turbofan engine" (PDF). GE Aviation.
- ^ "CF34-10E turbofan engine" (PDF). GE Aviation.
External links[]
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Wikimedia Commons has media related to General Electric CF34. |
- High-bypass turbofan engines
- General Electric aircraft engines