Engineering:General Electric CF34
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.[1][2] There are 7,500 engines in service.[3]
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 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]
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.[6] In September 2021, the Rolls-Royce F130 was selected instead of the GE proposal.[7]
Applications
CF34-1A
CF34-3
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
CF34-8
CF34-8C
- Bombardier CRJ550
- Bombardier CRJ700
- Bombardier CRJ705
CF34-8C on the Bombardier CRJ700 series. - Bombardier CRJ900
- Bombardier CRJ1000
CF34-8E
- Embraer 170
- Embraer 175
CF34-10
CF34-10A
CF34-10E
- Embraer 190
- Embraer 195
- Embraer Lineage 1000
Specifications
| CF34-3[9] | CF34-8C[10] | CF34-8E[11] | CF34-10A[12] | CF34-10E[13] | |
|---|---|---|---|---|---|
| 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) |
See also
Related development
Comparable engines
- Aviadvigatel PD-8
- 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
- ↑ The CF34 at aviationpros.com
- ↑ GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com
- ↑ https://www.geaerospace.com/commercial/aircraft-engines/cf34
- ↑ "E190 Values Start to Take Note of E2". Aircraft Value News. October 29, 2018. http://www.aircraftvaluenews.com/e190-values-start-to-take-note-of-e2-2/.
- ↑ David Hughes (Feb 13, 1995). "CF34-8C to power new regional jet". Aviation Week. http://archive.aviationweek.com/issue/19950213/#!&pid=70.
- ↑ "Propulsion Hub & Engine Product | GE Aviation". https://www.geaviation.com/military/engines/b-52.
- ↑ "Rolls-Royce North America selected to power the B-52 Commercial Engine Replacement Program". https://www.rolls-royce.com/media/press-releases/2021/24-09-2021-rr-north-america-selected-to-power-the-b-52-commercial-engine-replacement-program.aspx.
- ↑ "The CF34 Engine". GE Aviation. http://www.geaviation.com/commercial/engines/cf34/.
- ↑ "CF34-3 turbofan engine". GE Aviation. https://www.geaviation.com/sites/default/files/datasheet-CF34-3.pdf.
- ↑ "CF34-8C turbofan engine". GE Aviation. https://www.geaviation.com/sites/default/files/datasheet-CF34-8C.pdf.
- ↑ "CF34-8E turbofan engine". GE Aviation. https://www.geaviation.com/sites/default/files/datasheet-CF34-8E.pdf.
- ↑ "CF34-10A turbofan engine". GE Aviation. https://www.geaviation.com/sites/default/files/datasheet-CF34-10A.pdf.
- ↑ "CF34-10E turbofan engine". GE Aviation. https://www.geaviation.com/sites/default/files/datasheet-CF34-10E.pdf.
External links
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