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Nonlinear effects in transonic flutter with emphasis on manifestations of limit cycle oscillations

Schewe, G. and Mai, H. and Dietz, G. (2003) Nonlinear effects in transonic flutter with emphasis on manifestations of limit cycle oscillations. Journal of Fluids and Structures, 18 (1), pp. 3-22.

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Abstract

This paper presents flutter and forced oscillation experiments in a transonic wind tunnel. For an aeroelastic supercritical 2-D airfoil configuration we studied typical transonic phenomena in as pure a form as possible. Various manifestations of small-amplitude limit cycle oscillations were observed for different flow conditions as well as coexisting limit cycles. We demonstrated how very small control forces were sufficient to excite or suppress flutter oscillations. Limit cycle oscillations occurred under free and forced turbulent boundary layer transition in a perforated wall test-section. Flutter calculations based on experimental aerodynamic forces yield stability limits which show good agreement with directly measured experimental flutter values. The results indicate that flow separation at the trailling edge, and the interactions between the shock and the marginal region of separated flow beneath it, may be responsible for limiting the amplitude of the observed limit cycle oscillations.

Item URL in elib:https://elib.dlr.de/14399/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2003,
Title:Nonlinear effects in transonic flutter with emphasis on manifestations of limit cycle oscillations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schewe, G.UNSPECIFIEDUNSPECIFIED
Mai, H.UNSPECIFIEDUNSPECIFIED
Dietz, G.UNSPECIFIEDUNSPECIFIED
Date:2003
Journal or Publication Title:Journal of Fluids and Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:18
Page Range:pp. 3-22
Status:Published
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:48

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