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Influence of the Steady Deformation on Numerical Flutter Prediction for Highly Loaded and Flexible Fan Blades

Schuff, Matthias and Lengyel-Kampmann, Timea and Forsthofer, Nicolai (2017) Influence of the Steady Deformation on Numerical Flutter Prediction for Highly Loaded and Flexible Fan Blades. In: Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. ASME Turbo Expo 2017, 26.-30. Jun. 2017, Charlotte, NC, USA.

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Abstract

Deflections at off-design conditions can change the aeroelastic behavior of turbomachinery blades significantly. Therefore, steady-state deformations at each operating point cannot be neglected and need to be captured by CFD-CSM coupling. The implementation of an automated toolchain for the generation of a compressor map is presented. It includes steady FSC and is preceded by a flutter analysis. The CFD mesh is adapted to steady surface deflections via a mesh deformation using radial basis functions interpolation. Mode shape vibrations are computed at each operating point. Aerodynamic damping for each mode and IBPA is than assessed by unsteady RANS computations with time-linearization around the steady flow field. A detailed compressor map of a highly flexible CFRP fan, that was optimized within a multidisciplinary toolchain, is generated based on the geometry for design conditions. Elastic deformations affect a shift of the speedlines especially in near-choked conditions. At the surge line, some cases did not reach a steady-state deformation, oscillating between two deflections and indicating possible stall flutter. The impact of the steady deformation on predicting flutter boundaries for very elastic blades is pointed out by the comparison to a rigid setup. Significant differences are identified in the region of near-surged and stalled conditions and are due to large deformations, especially torsional deflections. The results of the underlying work of this paper will assist in identifying critical designs during optimization runs more quickly.

Item URL in elib:https://elib.dlr.de/113190/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of the Steady Deformation on Numerical Flutter Prediction for Highly Loaded and Flexible Fan Blades
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schuff, MatthiasMatthias.Schuff (at) dlr.dehttps://orcid.org/0000-0003-3276-2539
Lengyel-Kampmann, Timeatimea.lengyel (at) dlr.deUNSPECIFIED
Forsthofer, NicolaiNicolai.Forsthofer (at) dlr.deUNSPECIFIED
Date:June 2017
Journal or Publication Title:Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:turbomachinery, flutter, CFD, CSM, FSC, toolchain
Event Title:ASME Turbo Expo 2017
Event Location:Charlotte, NC, USA
Event Type:international Conference
Event Dates:26.-30. Jun. 2017
Organizer:The American Society of Mechanical Engineers (ASME)
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 - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Schuff, Matthias
Deposited On:14 Jul 2017 11:39
Last Modified:14 Jul 2017 11:39

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