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US 8,800,914 B2Granted
Gas turbine engine with low stage count low pressure turbine
AssigneeUnited Technologies Corporation
InventorsGabriel L. Suciu, Brian D. Merry, Christopher M. Dye, Steven B. Johnson, Frederick M. Schwarz
Life of this patent
Estimating the term…
Abstract
A gas turbine engine includes a spool along an engine centerline axis which drives a gear train.
Claims18
A gas turbine engine comprising:
- a core nacelle defined about an engine centerline 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 centerline 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 centerline 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, wherein said fan is driven by said spool through said gear train.
- 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.
4 more elements
A high bypass gas turbine engine comprising:
- a core nacelle defined about an engine centerline 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 centerline axis, said gear train defines a gear reduction ratio of greater than or equal to about 2.3;
- and
- a fan drive turbine rotatable about said engine centerline axis which drives said gear train, said fan drive turbine including three to six (3-6) stages;
- and
- a fan section configured for operation at a fan pressure ratio less than about 1.45 and to be driven by the fan drive turbine through the gear train, wherein said fan bypass airflow includes a bypass ratio greater than about (10).
4 more elements
Dependencies are inferred from the claim text.