GAS TURBINE ENGINE WITH LOW STAGE COUNT LOW PRESSURE TURBINE

摘要

A gas turbine engine includes a core nacelle defined about an engine axis. A fan nacelle is mounted at least partially around the core nacelle to define a fan bypass airflow path for a fan bypass airflow. A gear train is defined along an engine axis. The gear train defines a gear reduction ratio of greater than or equal to about 2.3. A fan drive turbine along the engine axis which drives the gear train. The fan drive turbine includes three to six (3-6) stages. A fan is configured for rotation within the fan nacelle for operation at a fan pressure ratio less than about 1.45. A fan variable area nozzle is axially movable relative to said fan nacelle to vary a fan nozzle exit area and adjust a pressure ratio of the fan bypass airflow during engine operation. A high bypass gas turbine engine is also disclosed.

主权项

1. A gas turbine engine comprising:
a core nacelle defined about an engine axis; a fan nacelle mounted at least partially around said core nacelle to define a fan bypass airflow path for a fan bypass airflow; a gear train defined along an engine axis, said gear train defines a gear reduction ratio of greater than or equal to about 2.3; a fan drive turbine along said engine axis which drives said gear train, said fan drive turbine including three to six (3-6) stages; and a fan configured for rotation within the fan nacelle for operation at a fan pressure ratio less than about 1.45, a fan variable area nozzle axially movable relative to said fan nacelle to vary a fan nozzle exit area and adjust a pressure ratio of the fan bypass airflow during engine operation.