General Electric CF34

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

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] 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 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,Script error: No such module "Unsubst". 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 Script error: No such module "convert". 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.[3] In 1995, GE invested $200 million to develop the -8C derivative for the CRJ700.[4]

GE had proposed updating the Boeing B-52 Stratofortress with CF34-10 engines, [5] but the Rolls-Royce F130 was selected in September 2021[6] instead.

Applications

CF34-1A
CF34-3A
CF34-3B
CF34-8C
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/CRJ200 CRJ700/900/1000 E170/175 C909 E190/195
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Fan Script error: No such module "convert". Script error: No such module "convert". Script error: No such module "convert".
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) Script error: No such module "convert". Script error: No such module "convert". Script error: No such module "convert". Script error: No such module "convert". Script error: No such module "convert".
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
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See also

Related development

Comparable engines

Related lists

References

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  1. ↑ The CF34 at aviationpros.com
  2. ↑ GE's CF34-3 Engines Celebrate 20 Years of Regional Jet Service at aviationpros.com
  3. ↑ Script error: No such module "citation/CS1".
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  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
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External links

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