Geared turbofan gas turbine engine architecture

摘要

A gas turbine engine includes a combustor. A turbine section is in fluid communication with the combustor. The turbine section includes a fan drive turbine and a second turbine. The fan drive turbine includes a plurality of turbine rotors. A fan includes a plurality of blades rotatable about an axis and a ratio between the number of fan blades and the number of fan drive turbine rotors is between about 2.5 and about 8.5. A speed change system is driven by the fan drive turbine for rotating the fan about the axis. The fan drive turbine has a first exit area at a first exit point and rotates at a first speed. The 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. A first performance quantity is defined as the product of the first speed squared and the first area. A second performance quantity is defined as the product of the second speed squared and the second area. A performance ratio of the first performance quantity to the second performance quantity is between about 0.5 and about 1.5.

主权项

1. A gas turbine engine comprising:
a combustor; a turbine section in fluid communication with the combustor, the turbine section including a fan drive turbine and a second turbine section, the fan drive turbine including a plurality of turbine rotors; a fan including a plurality of blades rotatable about an axis and a ratio between a number of fan blades and a number of fan drive turbine rotors is between about 2.5 and about 8.5; and a speed change system driven by the fan drive turbine for rotating the fan about the axis; wherein the fan drive turbine has a first exit area at a first exit point and rotates at a first speed, the 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 a product of the first speed squared and the first exit area, a second performance quantity is defined as a product of the second speed squared and the second exit area, and a performance ratio of the first performance quantity to the second performance quantity is between about 0.5 and about 1.5.