General Electric CF34

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.

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
CF34 engine mounted on an Embraer E-190
Recent versions of the CF34 feature chevrons on the core nozzle outlet.

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, 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
CF34-3A2
CF34-3B
  • Bombardier Challenger 604
  • Bombardier Challenger 605
CF34-3B1
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

Specifications
CF34 Engine Comparison[7]
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

Related lists

References
  1. GE Aviation at flightglobal.com
  2. The CF34 at aviationpros.com
  3. GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com
  4. "E190 Values Start to Take Note of E2". Aircraft Value News. October 29, 2018.
  5. David Hughes (Feb 13, 1995). "CF34-8C to power new regional jet". Aviation Week.
  6. ((cite website |url=https://www.geaviation.com/military/engines/b-52%7Cretreived= Jun 25,2020}}
  7. "The CF34 Engine". GE Aviation.
  8. "CF34-3 turbofan engine" (PDF). GE Aviation.
  9. "CF34-8C turbofan engine" (PDF). GE Aviation.
  10. "CF34-8E turbofan engine" (PDF). GE Aviation.
  11. "CF34-10A turbofan engine" (PDF). GE Aviation.
  12. "CF34-10E turbofan engine" (PDF). GE Aviation.
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