Experiments on Heave / Pitch Limit-Cycle Oscillations of a Supercritical Airfoil
Dietz, G. and Schewe, G. and Mai, H. (2005) Experiments on Heave / Pitch Limit-Cycle Oscillations of a Supercritical Airfoil. In: Vortex dominated flows: A volume celebrating Lu Ting's 80th birthday World Scientific, New Jersey, London, Singapore, Bijing, Shanghai, Hong Kong, Taipeo, Chennai. pp. 43-66. ISBN 981-256-320-2.
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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. 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.
|Document Type:||Book Section|
|Title:||Experiments on Heave / Pitch Limit-Cycle Oscillations of a Supercritical Airfoil|
|Journal or Publication Title:||Vortex dominated flows: A volume celebrating Lu Ting's 80th birthday|
|In ISI Web of Science:||No|
|Page Range:||pp. 43-66|
|Publisher:||World Scientific, New Jersey, London, Singapore, Bijing, Shanghai, Hong Kong, Taipeo, Chennai|
|Keywords:||Limit Cycle Oscillations, LCO, Transonic Dip, Flutter|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ST - Starrflüglertechnologien|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Aeroelasticity|
|Deposited By:||Daniela Erdmann|
|Deposited On:||09 Oct 2005|
|Last Modified:||14 Jan 2010 19:42|
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