GEAR SYSTEM ARCHITECTURE FOR GAS TURBINE ENGINE

摘要

A fan drive gear system for a gas turbine engine includes a gear system that provides a speed reduction between a fan drive turbine and a fan and a mount flexibly supporting portions of the gear system. A lubrication system supporting the fan drive gear system provides lubricant to the gear system and removes thermal energy produced by the gear system. The lubrication system includes a capacity for removing thermal energy equal to less than about 2% of power input into the gear system.

主权项

1. A gas turbine engine comprising:
a fan including a plurality of fan blades rotatable about an axis; a fan pressure ratio across a fan blade alone of less than 1.45; a bypass duct; a compressor section; a bypass ratio greater than 10, the bypass ratio being defined as the portion of air delivered into the bypass duct divided by the amount of air delivered into the compressor section; a combustor in fluid communication with the compressor section; a fan drive turbine in communication with the combustor, the fan drive turbine comprising a pressure ratio greater than about 5, wherein the fan drive turbine further includes an inlet having an inlet pressure, and an outlet that is prior to any exhaust nozzle and having an outlet pressure, and the pressure ratio of the fan drive turbine is a ratio of the inlet pressure to the outlet pressure; a gear system configured to provide a speed reduction between the fan drive turbine and the fan and transfer power input from the fan drive turbine to the fan at an efficiency greater than 98%, wherein the gear system further comprises a gear reduction ratio of greater than 2.3; and a lubrication system configured to provide lubricant to the gear system and remove thermal energy from the gear system; and wherein the plurality of fan blades is less than twenty (20) and the plurality of fan drive turbine rotors is less than six (6) fan drive turbine rotors, and a ratio between the number of fan blades and the number of fan drive turbine rotors is between 3.3 and 8.6.