GEARED TURBOFAN GAS TURBINE ENGINE ARCHITECTURE

摘要

A gas turbine engine (20) includes a fan (42) rotatable about an axis (A), a compressor section (24), a combustor (56) in fluid communication with the compressor section (24), and a turbine section (28) in fluid communication with the combustor (56). The turbine section (28) includes a fan drive turbine (46), a second turbine that drives a compressor rotor and one other turbine driving another compressor rotor of the compressor section (24). The second turbine (54) is disposed forward of the fan drive turbine (46). The fan drive turbine (46) includes at least three rotors and at least one rotor having a bore radius (R) and a live rim radius (r), and a ratio of r/R is between about 2.00 and about 2.30. A speed change system (48) is driven by the fan drive turbine (46) for rotating the fan (42) about the axis (A).