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Computation of Aerodynamic Damping for Flutter Analysis of a Transonic Fan

Vasanthakumar , Parthasarathy (2011) Computation of Aerodynamic Damping for Flutter Analysis of a Transonic Fan. In: Proceedings of ASME Turbo Expo 2011 (GT2011-46597). ASME Turbo Expo 2011, 06 - 10 June 2011, Vancouver, Canada.

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This paper describes the computational analysis of aerodynamic damping for prediction of flutter characteristics of a transonic fan stage that consists of a highly loaded rotor along with a tandem stator. Three dimensional, linearized Navier-Stokes flow solver TRACE is used to numerically analyse the flutter stability of the fan. The linear flow solver enables the modeling of a single blade passage to simulate the desired inter-blade phase angle. The unsteady aerodynamic load on a vibrating blade is obtained by solving the unsteady Navier-Stokes equations on a dynamically deforming grid and the energy exchange method is used to calculate the aerodynamic damping. The calculation of aerodynamic damping for the prediction of flutter characteristics of the fan rotor is carried out with and without considering the influence of the disk. The blade mode shapes from finite element modal analysis are obtained accordingly and the flutter calculations are carried out for three blade vibration modes at the design speed and at part speeds for all possible inter-blade phase angles. Two operating points, one on the working line and the other near stall are investigated at every rotational speed. Different aspects that affect the aerodynamic damping behaviour like part speed operation, variation in unsteady blade surface pressure fluctuation between operating points on the working line and at near stall and the corresponding variation in aerodynamic work, inter-blade phase angle etc., are described. This analysis primarily focuses on the variations in aerodynamic damping of the fan with and without the influence of the disk. In addition, influence and effect of shock wave on the aerodynamic damping is also discussed.

Item URL in elib:https://elib.dlr.de/70210/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Computation of Aerodynamic Damping for Flutter Analysis of a Transonic Fan
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vasanthakumar , ParthasarathyUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Proceedings of ASME Turbo Expo 2011
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:computational analysis, unsteady aerodynamics
Event Title:ASME Turbo Expo 2011
Event Location:Vancouver, Canada
Event Type:international Conference
Event Dates:06 - 10 June 2011
Organizer:American Society of Mechanical Engineers
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:10 Nov 2011 09:06
Last Modified:31 Jul 2019 19:32

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