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Hybrid structures in aero engines

Kocian, Frank and Ebel, Paul-Benjamin and Drees, Björn and Schulze, Karola and Hausmann, Joachim and Voggenreiter, Heinz (2014) Hybrid structures in aero engines. In: CEAS Aeronautical Journal Springer. ISSN 1869-5582

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Official URL: http://link.springer.com/article/10.1007/s13272-014-0141-0

Abstract

The continuous increase in already high specific performance of aero engines and growing optimization demands require further innovation in the fields of materials and design of structures to reach the primarily aerodynamic driven goals. In general, the improvement of materials on its own cannot guarantee success but rather the combination of different materials offers the potential for increased performance and additional functionality. For using different material properties, an adapted hybrid design is necessary. Within this design outstanding material characteristics should be addressed, whilst the lower performance properties must not be critical and provoke faults. By combining different materials within hybrid structures, the feasible increase in performance is accompanied with the challenges of handling a lot more parameters for optimization. Three examples are described in this paper, showing hybrid design approaches for aero engine structures. The design principles can be transferred to similar structures by using the shown basic mechanisms. The first example covers a hybrid ring structure used for simultaneous movement of stator vanes within an axial compressor. BLISK technology with high aerodynamic efficiency and low structural damping requires an accurate positioning of the stator vanes to avoid dynamic excitation in transient surroundings during a complete flight cycle. Additionally, the weight of the structure should be reduced compared to conventional in-service structures. A second example shows a hybrid fan blade. Here it is demonstrated how titanium can be combined with carbon fibre-reinforced plastics to create an airfoil. This concept can be implemented in generating stator vanes and rotor blades for aero engines. A special surface treatment leads to a non-aging jointbetween the two materials. The third example explains the basics for an alternative hybrid rotor design. Three titanium rotor segments are joined together by brazing under vacuum conditions. During the manufacturing process, the inner areas of the rotor are accessible which offers the opportunity to integrate cavities as well as fibre reinforcement.

Item URL in elib:https://elib.dlr.de/93711/
Document Type:Contribution to a Collection
Title:Hybrid structures in aero engines
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kocian, Frankfrank.kocian (at) dlr.deUNSPECIFIED
Ebel, Paul-Benjaminpaul.ebel (at) dlr.deUNSPECIFIED
Drees, Björnbjoern.drees (at) dlr.deUNSPECIFIED
Schulze, Karolakarola.schulze (at) dlr.deUNSPECIFIED
Hausmann, Joachimjoachim.hausmann (at) dlr.deUNSPECIFIED
Voggenreiter, HeinzHeinz.Voggenreiter (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1007/s13272-014-0141-0
Publisher:Springer
ISSN:1869-5582
Status:Published
Keywords:Hybrid, Aero Engines, multidisciplinary
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 , Stuttgart
Institutes and Institutions:Institute of Structures and Design > Design and Manufacture Technologies
Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Ebel, Paul-Benjamin
Deposited On:22 Dec 2014 15:27
Last Modified:28 Sep 2015 10:09

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