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Optimization of an engine with a gear driven counter rotating fan Part II: Cycle selection and performance

Otten, Tom and Lengyel, Timea and Becker, Richard-Gregor and Reitenbach, Stanislaus (2015) Optimization of an engine with a gear driven counter rotating fan Part II: Cycle selection and performance. ISABE Conference 2015, 26-30.Oktober 2015, Phoenix, AZ, USA.

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Abstract

Aircraft fuel efficiency becomes more and more important because of increasing fuel prices and environmental concerns. Engine efficiency contributes substantially to this, but further improvements are very demanding due to the already mature technology. To achieve further enhancements, the introduction of new engine concepts is currently in discussion. Most of these concepts focus on improving propulsive efficiency. In this two-part study, the concept of the counter rotating fan (CR-fan) is assessed. In the first part of this study, the fan concept is analysed considering aerodynamical aspects. The focus of the present part of the study is to assess the CR-fan concept on engine level. To assess the results of the aerodynamic optimization on an overall engine level, a cycle design study is performed. For a civil long range application, the aircraft characteristics are modelled and engine requirements are derived. Then a cycle is developed, taking both the constraints from the thermodynamic limitations and the thrust requirements from the flight mission into account. Besides the thermodynamic modelling, weight and drag analyses for the engine are performed. The fan aerodynamics and weight is directly taken from the first part of this study. The technology assumptions for the other engine components are taken from literature. The close link between fan design and performance study allows for a detailed description of the propulsor within the thermodynamic model. As a result the optimal aerodynamic fan design is identified by finding the best compromise between cycle demands, fan efficiency, weight and drag in order to minimize fuel consumption. Finally, an engine cycle for a CR-fan is defined taking into account the gearbox influenced off-design behaviour of the fan rotors.

Item URL in elib:https://elib.dlr.de/101125/
Document Type:Conference or Workshop Item (Speech)
Title:Optimization of an engine with a gear driven counter rotating fan Part II: Cycle selection and performance
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Otten, TomDLR, Institut für AntriebstechnikUNSPECIFIED
Lengyel, TimeaDLR, Institut für AntriebstechnikUNSPECIFIED
Becker, Richard-GregorDLR, Institut für AntriebstechnikUNSPECIFIED
Reitenbach, StanislausDLR, Institut für AntriebstechnikUNSPECIFIED
Date:28 October 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Optimierung, Fan, Triebwerk, Getriebe
Event Title:ISABE Conference 2015
Event Location:Phoenix, AZ, USA
Event Type:international Conference
Event Dates:26-30.Oktober 2015
Organizer:ISABE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Otten, Tom
Deposited On:21 Dec 2015 08:53
Last Modified:21 Dec 2015 08:53

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