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Fan casing contouring under consideration of aeroacoustics, mechanics, aeroelasticity and whole engine performance

Aulich, Anne-Laure and Sauer, Tim and Iseni, Senad and Moreau, Antoine and Peitsch, Dieter and Mailach, Ronald and Micallef, Derek and Enghardt, Lars and Nicke, Eberhard (2015) Fan casing contouring under consideration of aeroacoustics, mechanics, aeroelasticity and whole engine performance. Deutscher Luft- und Raumfahrtkongress 2015, 22.-24. Spetember 2015, Rostock.

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Aircraft propulsion will continue to rely on gas turbine technology for the next decades to come. Thus, to achieve environmental agreements, ensure engine safety and retain economic competitiveness, ongoing development with a multidisciplinary design approach is indispensable. In the present study the multi criteria analysis of the fan, a decisive component in modern aero engines, is examined. In particular the interaction of the fan blades with the fan casing is analyzed and an appropriate design approach including automatic optimization is used. As one part of the disciplines conjunction an automated aeroacoustic approach is realized. The aerodynamic and acoustic fitness functions and constraints are based on Reynolds-Averaged Navier-Stokes (RANS) simulations of the fan stage. A fast analytical prediction tool for fan noise, PropNoise, which has been under development since recent years and already validated on several test cases, is used. Preliminary studies have shown that the flow in the rotor tip region is a major contributor to the broadband noise emission. Based on this, the optimization process focuses on the variation of the casing contour around the fan blades. The impact of the modified flow field in the rotor tip region concerning the aeroelastic behavior is also investigated. As aeroelastic evaluation requires a high level of know-how and is very time consuming, it is linked to the optimization process chain by a discrete evaluation of selected members. This allows a simultaneous adjustment of the design in case of aeroelastic issues. Furthermore, the impact of the fan modifications regarding the overall engine performance is evaluated. Off-design cycle calculations allow incorporating such detailed studies in a global engine optimization.

Item URL in elib:https://elib.dlr.de/99622/
Document Type:Conference or Workshop Item (Speech)
Title:Fan casing contouring under consideration of aeroacoustics, mechanics, aeroelasticity and whole engine performance
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Aulich, Anne-LaureDLR, KölnUNSPECIFIED
Iseni, SenadRU-BochumUNSPECIFIED
Moreau, AntoineDLR, BerlinUNSPECIFIED
Peitsch, DieterTU-BerlinUNSPECIFIED
Mailach, RonaldRU-BochumUNSPECIFIED
Micallef, DerekRU-BochumUNSPECIFIED
Enghardt, LarsDLR, BerlinUNSPECIFIED
Nicke, EberhardDLR, KölnUNSPECIFIED
Date:13 November 2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Fan casing contouring, optimization, acoustics, flutter prediction, whole engine performance
Event Title:Deutscher Luft- und Raumfahrtkongress 2015
Event Location:Rostock
Event Type:national Conference
Event Dates:22.-24. Spetember 2015
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Institute of Propulsion Technology > Engine Acoustic
Deposited By: Aulich, Anne-Laure
Deposited On:18 Nov 2015 15:55
Last Modified:31 Jul 2019 19:56

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