Geared architecture for high speed and small volume fan drive turbine

摘要

A gas turbine engine includes a flex mount for a fan drive gear system. A very high speed fan drive turbine drives the fan drive gear system.

主权项

1. A gas turbine engine comprising:
a fan shaft driving a fan; a frame which supports said fan shaft; a plurality of gears to drive said fan shaft; a flexible support which at least partially supports said plurality of gears, said flexible support having a different stiffness than said frame; a first turbine section providing a drive input into said plurality of gears; and a second turbine section, wherein said first turbine section has a first exit area at a first exit point and rotates at a first speed, wherein said second turbine section has a second exit area at a second exit point and rotates at a second speed, which is faster than the first speed, wherein a first performance quantity is defined as the product of the first speed squared and the first area, wherein a second performance quantity is defined as the product of the second speed squared and the second area, and wherein a ratio of the first performance quantity to the second performance quantity is between about 0.5 and about 1.5.