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Performance and Weight Estimates for an Advanced Open Rotor EngineNASA s Environmentally Responsible Aviation Project and Subsonic Fixed Wing Project are focused on developing concepts and technologies which may enable dramatic reductions to the environmental impact of future generation subsonic aircraft. The open rotor concept (also historically referred to an unducted fan or advanced turboprop) may allow for the achievement of this objective by reducing engine fuel consumption. To evaluate the potential impact of open rotor engines, cycle modeling and engine weight estimation capabilities have been developed. The initial development of the cycle modeling capabilities in the Numerical Propulsion System Simulation (NPSS) tool was presented in a previous paper. Following that initial development, further advancements have been made to the cycle modeling and weight estimation capabilities for open rotor engines and are presented in this paper. The developed modeling capabilities are used to predict the performance of an advanced open rotor concept using modern counter-rotating propeller designs. Finally, performance and weight estimates for this engine are presented and compared to results from a previous NASA study of advanced geared and direct-drive turbofans.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Hendricks, Eric S.
(NASA Glenn Research Center Cleveland, OH, United States)
Tong, Michael T.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 26, 2013
Publication Date
September 1, 2012
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
AIAA Paper 2012-3911
Meeting Information
Meeting: 48th Joint Propulsion Conference and Exhibit
Location: Atlanta, GA
Country: United States
Start Date: July 30, 2012
End Date: August 1, 2012
Sponsors: American Society of Mechanical Engineers, American Society for Electrical Engineers, Society of Automotive Engineers, Inc., American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 561581.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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