General Electric CF34

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
Unit cost CF34-8C5: $4 million (2012) [2]
CF34-10E: $7.3 Million (2012) [3]
Developed from General Electric TF34
Developed into General Electric NG34[4]
A CF34-8 mounted on the #2 (inner) pylon of GE's Boeing 747-100 flight test aircraft at Mojave Airport in 2002
CF34 engine mounted on an Embraer E-190
Recent versions of the CF34 feature chevrons on the core nozzle outlet.

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.[5][6] As of 2012, there are over 5,600 engines in service.

Design and development

The original engines comprise 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, 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 82 kilonewtons (18,500 lbf) for the -10E variant.

Applications

CF34-1A
CF34-3A
CF34-3A1
CF34-3A2
CF34-3B
CF34-3B1
CF34-8C1
CF34-8C5
CF34-8C5A1
CF34-8C5B1
CF34-8E
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 fan
14 HP stages, 14:1		 1 46.2 in fan
10 HP stages		 1 53 in 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 5:1 5.4:1
Cruise SFC .69 lb/lbf/h (20 g/kN/s) .67–.68 lb/lbf/h (19–19 g/kN/s) .68 lb/lbf/h (19 g/kN/s) .65 lb/lbf/h (18 g/kN/s) .64 lb/lbf/h (18 g/kN/s)

See also

Related development
Comparable engines
Related lists

References

  1. ↑ GE Aviation at flightglobal.com
  2. ↑ http://www.geaviation.com/press/cf34/cf34_20121206.html
  3. ↑ http://www.geaviation.com/press/cf34/cf34_20110620.html
  4. ↑ Technology Development Continues for Next-Generation Turbofan and Turboprop Engines at geaviation.com
  5. ↑ The CF34 at aviationpros.com
  6. ↑ GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com
  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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