Rolls-royce Corporation

Gareth M Armstrong

Nicholas Howarth

Michael Philip Keenan

A gas turbine engine has a compression system blade ratio defined as the ratio of the height of a fan blade to the height of the most downstream compressor blade in the range of from 45 to 95. This results in an optimum balance between installation benefits, operability, maintenance requirements and engine efficiency when the gas turbine engine is installed on an aircraft.

Geared gas turbine engine

A gas turbine engine has a compression system radius ratio defined as the ratio of the radius of the tip of a fan blade to the radius of the tip of the most downstream compressor blade in the range of from 5 to 9. This results in an optimum balance between installation benefits, operability, maintenance requirements and engine efficiency when the gas turbine engine is installed on an aircraft.

Gas turbine engine compression system with core compressor pressure ratio

A gas turbine engine that has improved fuel burn provides operability and/or maintenance requirements when installed on an aircraft. The gas turbine engine is provided with a core compressor that includes twelve, thirteen or fourteen rotor stages. The gas turbine engine has a ratio of a core compressor aspect ratio divided by a core compressor pressure ratio is in the range of from 0.03 to 0.09. This results in an optimum balance between installation benefits, operability, maintenance requirements and engine efficiency when the gas turbine engine is installed on an aircraft.

Efficient gas turbine engine installation and operation

Gas turbine engine compression system

The present disclosure relates to a metallic shaft for connecting components of a gas turbine engine. Example embodiments include a metallic shaft () for connecting components of a gas turbine engine, the shaft () having a longitudinal axis () and comprising: a first section () extending from a first end () of the shaft () to a joint (), the first section () composed of a material having a first thermal expansion coefficient along the longitudinal axis (); a second section () extending from a second opposing end () of the shaft to the joint (), the second section () composed of a material having a second thermal expansion coefficient along the longitudinal axis () that is different to the first thermal expansion coefficient.

Growing community of inventors

Nottingham, United Kingdom

Gareth M Armstrong