General Electric CF34
| CF34 | |
|---|---|
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| A CF34-8 mounted on the #2 pylon of GE's Boeing 747-100 flight test aircraft at Mojave Airport in 2002. | |
| Type | Turbofan |
| National origin | United States |
| Manufacturer | General Electric |
| First run | 1960s |
| Major applications | COMAC ARJ21 Bombardier Challenger 601 Bombardier CRJ Embraer E-Jets |
| Developed from | General Electric TF34 |
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The General Electric CF34 is a civilian turbofan developed by GE Aircraft Engines from its TF34 military engine. The CF34 is used on a number of jet airliners, including the Bombardier CRJ series, the Embraer E-Jets, and the Chinese ARJ21 under development.
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[edit] Design and development
The original engines comprise a single stage fan, driven by a 4-stage LP turbine, supercharging a 14-stage 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, comprising a 9 stage compressor driven by a single stage turbine. The LP spool has 3 core booster stages behind the fan. Static thrust is 18,500 lbf for the -10E variant.
[edit] Applications
- CF34-1
- CF34-3A
- CF34-3A1
- CF34-3A2
- CF34-3B
- CF34-3B1
- CF34-8C1
- Bombardier CRJ700 (Series 701) note:retired
- CF34-8C5
- Bombardier CRJ700 (Series 705) note: 8C5 is downrated @ the 700er series
- Bombardier CRJ900
- Bombardier CRJ900 NextGen
- CF34-8C5A1
- CF34-8C5B1
- CF34-8E
- CF34-10A
- CF34-10E
[edit] Specifications
| TF34 | CF34-1 | CF34-3 | CF34-8 | CF34-10 | |
|---|---|---|---|---|---|
| Length | 103 in | ||||
| Diameter | 49 in | 57 in | |||
| Dry weight | |||||
| Compressor | 1 fan 14 HP stages |
1 fan 10 HP stages |
1 fan + 3 LP stages 9 HP stages |
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| Turbine | 4 LP stages 2 HP stages |
4 LP stages 2 HP stages |
4 LP stages 1 HP stage |
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| Thrust at sea level |
9,220 lbf | 13,790 - 14,510 lbf | 18,285 - 20,000 lbf | ||
| Power-to-weight ratio |
5.6:1 | 5.3:1 | 5.2:1 | ||
| Overall pressure ratio at max. power |
21:1 | 28:1 - 28.5:1 | 29:1 | ||
| Bypass ratio | 6.2:1 | 5:1 | 5:1 |
[edit] See also
- Related development
- Comparable engines
- Related lists
[edit] References
[edit] External links
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