The Promise and Challenges of Ultra High Bypass Ratio Engine
Technology and Integration
Summary
In this presentation, an overview of the research being conducted by the ERA Project in
Ultra High Bypass aircraft propulsion and in partnership with Pratt & Whitney with their
Geared TurboFan (GTF) is given. The ERA goals are shown followed by a discussion of
what areas need to be addressed on the engine to achieve the goals and how the GTF is
uniquely qualified to meet the goals through a discussion of what benefits the cycle
provides. The first generation GTF architecture is then shown highlighting the areas of
collaboration with NASA, and the fuel burn, noise and emissions reductions possible based
on initial static ground test and flight test data of the first GTF engine. Finally, a 5 year
technology roadmap is presented focusing on Ultra High Bypass propulsion technology
research areas that are being pursued and being planned by ERA and P&W under their
GTF program.
National Aeronautics and Space Administration
www.nasa.gov
The Promise And Challenges Of Ultra High Bypass Ratio
Engine Technology and Integration
AIAA Aero Sciences Meeting
January 4-7, 2011
Chris Hughes
Ultra High Bypass Engine Technology Sub-Element
Propulsion Technology Element
NASA Glenn Research Center
Environmentally Responsible Aviation Project
Integrated Systems Research Program
Geared Turbofan Technology Enables a Step-Change in
Ultra High Bypass Propulsion
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Courtesy Pratt & Whitney
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NASA’s Subsonic Transport System Level Metrics
Summarizing the potential technology payoff …
…. Innovative technology for dramatically reducing noise, emissions and fuel
burn
Propulsion System Fuel Burn Drivers
4
Propulsive Efficiency Trend with Fan Pressure Ratio
5
Geared Turbofan Technology Enables Paradigm Shifts
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NASA/P&W Partnership on Geared Turbofan Technology
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GTF Emissions Reduction Goals
Ultra High Bypass Technology Development Roadmap
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Summary
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