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Experiments on heave/pitch limit-cycle oscillations of a supercritical airfoil close to the transonic dip

Dietz, G. and Schewe, G. and Mai, H. (2004) Experiments on heave/pitch limit-cycle oscillations of a supercritical airfoil close to the transonic dip. Journal of Fluids and Structures, 19 (1), pp. 1-16.

Full text not available from this repository.

Abstract

Recent results from flutter experiments of the supercritical airfoil NLR 7301 at flow conditions near the transonic dip are presented. The airfoil was mounted with two degrees of freedom in an adaptive solid-wall wind tunnel, and boundary-layer transition was tripped. Two limit-cycle oscillation (LCO) test cases obtained in an adaptive test-section are proposed for comparison with numerical simulations. The results link the global aerodynamic force behavior to the observed LCOs and the identified transonic dip. The time lag of the lift response to the pitching motion of the airfoil appears to be responsible for the characteristic shape of the transonic dip. The amplitude limitation of the LCOs results from a slightly nonlinear dependency of lift and moment on the amplitude of the airfoil motion. LCOs can be controlled by relatively small forces, but amplitudes strongly depend on the damping of the aeroelastic system.

Item URL in elib:https://elib.dlr.de/14424/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Experiments on heave/pitch limit-cycle oscillations of a supercritical airfoil close to the transonic dip
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dietz, G.UNSPECIFIEDUNSPECIFIED
Schewe, G.UNSPECIFIEDUNSPECIFIED
Mai, H.UNSPECIFIEDUNSPECIFIED
Date:2004
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:19
Page Range:pp. 1-16
Status:Published
Keywords:Limit-Cycle Oscillations, LCO, Transonic Dip, Flutter
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 21:50

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