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.[1] [2] In 2012, there were 5,600 engines in service.
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 and, 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 18500lbf for the 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.
| 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 | |
| Length | 103abbr=onNaNabbr=on | 128inches | 121inches | 90inches | 145inches | |
| Diameter | 49inches | 52inches | 53inches | 57inches | 57inches | |
| Dry weight | 1670lb | 2400- | 2600abbr=onNaNabbr=on | 3700abbr=onNaNabbr=on | 3700abbr=onNaNabbr=on | |
| Fan | 44inches | 46.2inches | 53inches | |||
| Compressor | 14 stages, 14:1 | 10 HP stages | 3 + 9 stages | |||
| Turbine | 4 + 2 stages | 4 LP + 1 HP stage | ||||
| Thrust (SL) | 9220abbr=onNaNabbr=on | 13790- | 14500lbf | 17640lbf | 20360lbf | |
| 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) | 0.69lb/lbf/h | 0.67- | 0.68abbr=onNaNabbr=on | 0.65abbr=onNaNabbr=on | 0.64abbr=onNaNabbr=on | |