Soaring fuel costs have triggered the development of a new generation of aircraft propulsion systems as well as performance modifications to current systems. This paper presents performance improvement features for General Electric turbofan engines that have either been developed or are being developed for commercial use. A number of these performance improvement features were the direct result of technology developed under the sponsorship of the National Aeronautic and Space Administration’s Engine Component Improvement (ECI) Program and the evolution of some of these performance improvement features is traced through current and future engines. Discussions will be directed toward performance features such as fan and exhaust nozzle aerodynamics improvements, improved turbomachinery clearance control, reduced flowpath losses, and high efficiency turbine cooling.

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