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Fan Casing Contouring under Consideration of Aeroacoustics, Mechanics, Aeroelasticity, and whole Engine Performance
Citation key 2015_aulich_dlrk
Author Aulich, A.-L. and Sauer, T. and Iseni, S. and Moreau, A. and Peitsch, D. and Mailach, R. and Micallef, D. and Enghardt, L. and Nicke, E.
Pages 370127
Year 2015
DOI urn:nbn:de:101:1-201511134337
Location Rostock, Germany
Journal Deutscher Luft- und Raumfahrtkongress
Month 09
Note Deutsches Zentrum für Luft und Raumfahrt (DLR), Köln:
A.-L. Aulich, E. Nicke
Technische Universität Berlin:
T. Sauer, D. Peitsch
Ruhr-Universität Bochum (RUB):
S. Iseni, D. Micallef
Deutsches Zentrum für Luft und Raumfahrt (DLR), Berlin:
A. Moreau, L. Enghardt
Technische Universität Dresden:
R. Mailach
Editor Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.
Abstract 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. PropNoise, a fast analytical prediction tool for fan noise, is used. It has been under development since recent years and is already validated on several test cases. 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.
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