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Evaluation of Ultra-High Bypass Ratio Engines for an Over-Wing Aircraft Configuration

Giesecke, Daniel and Lehmler, Marcel and Friedrichs, Jens and Blinstrub, Jason and Bertsch, Lothar and Heinze, Wolfgang (2018) Evaluation of Ultra-High Bypass Ratio Engines for an Over-Wing Aircraft Configuration. Journal of the Global Power and Propulsion Society, 2, pp. 493-515. doi: 10.22261/JGPPS.8SHP7K. ISSN 2515-3080.

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Official URL: https://www.gppsjournal.org/journals/journal-of-the-global-power-and-propulsion-society/uhbr-engines-for-an-over-wing-aircraft-configuration/


Today, main hub airports are already at their capacity limit and hence, smaller airports get more interesting to provide point-to-point connections. Unfortunately, the use of regional airports induces an increased environmental footprint for the population living around it. In an attempt to solve the related problems, unconventional aircraft and engine designs are required. The research project Coordinated Research Centre 880 aims at examing the fundamentals of a single-aisle aircraft powered by two geared ultra-high bypass turbofan engines mounted over the wing. Low direct operating costs, noise shielding due to the over-wing configuration, and short runway lengths are the main advantages of such an aircraft. Highlighting the performance, economical and noise benefits of a geared ultra-high bypass engine is the key aim of this paper. This assessment includes a correspondingly adjusted aircraft. Open literature values are applied to design the two investigated bypass ratios; an engine with a bypass ratio of 5 respectively 17. Furthermore, a variable bypass nozzle area for the ultra-high bypass ratio engine is analyzed. Finally, the three engines are evaluated based on aircraft direct operating costs and an initial engine noise assessment. This study concludes that increasing the bypass ratio from 5 to 17 drops the direct operating costs by 5.6% and can reduce the sound at the source for a selected operating condition by up to 7dB. During the different flight phases the reduction in specific fuel consumption ranges between 18% to 40%. Applying a variable bypass nozzle leads to a further decrease by 0.6% for the direct operating costs. Opening the bypass nozzle during several flight phases stabilizes the fan shown by the surge margin increase. It is concluded that this unconventional aircraft configuration with ultra-high bypass ratio engines mounted over the wing has the potential to relieve main hub airports by also reducing the environmental impact.

Item URL in elib:https://elib.dlr.de/114429/
Document Type:Article
Title:Evaluation of Ultra-High Bypass Ratio Engines for an Over-Wing Aircraft Configuration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Giesecke, DanielIFAS, TU BraunschweigUNSPECIFIED
Lehmler, MarcelIFAS, TU BraunschweigUNSPECIFIED
Friedrichs, JensIFAS, TU BraunschweigUNSPECIFIED
Blinstrub, Jasonjason.blinstrub (at) dlr.dehttps://orcid.org/0000-0003-1913-0529
Bertsch, LotharLothar.Bertsch (at) dlr.dehttps://orcid.org/0000-0003-2780-2858
Heinze, WolfgangIFL, TU BraunschweigUNSPECIFIED
Date:17 October 2018
Journal or Publication Title:Journal of the Global Power and Propulsion Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:No
DOI :10.22261/JGPPS.8SHP7K
Page Range:pp. 493-515
Keywords:PANAM, SHADOW, UHBR, engine design, aircraft design, SFB880
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Winkels, Elisabeth
Deposited On:01 Nov 2018 12:54
Last Modified:01 Nov 2018 12:54

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