Dietz, Guido und Schewe, Günter und Mai, Holger (2006) Amplification and amplitude limitation of heave/pitch limit-cycle oscillations close to the transonic dip. Journal of Fluids and Structures, 22 (4), Seiten 505-527. Elsevier.
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Offizielle URL: http://www.elsevier.com
Kurzfassung
Recent results from flutter experiments of the supercritical airfoil NLR 7301 at flow conditions close to 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. Flutter boundaries exhibiting a transonic dip were determined and limit-cycle oscillations (LCOs) were measured. The local energy exchange between the fluid and the structure during LCOs is examined and leads to the following findings: at supercritical Mach numbers below that of the transonic-dip minimum the presence of a shock-wave and its dynamics destabilizes the aeroelastic system such that the decreasing branch of the transonic dip develops. At higher Mach numbers the shock-wave motion has a stabilizing effect such that the flutter boundary increases to higher flutter-speed indices with increasing Mach number. Amplified oscillations near this branch of the flutter boundary obtain energy from the flow mainly due to the dynamics of a trailing-edge flow separation. A slight nonlinear amplitude dependency of the shock motion and a possibly occurring boundary-layer separation cause the amplitude limitation of the observed LCOs. The impact of the findings on the numerical simulation of these phenomena is discussed.
elib-URL des Eintrags: | https://elib.dlr.de/43722/ | ||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||
Titel: | Amplification and amplitude limitation of heave/pitch limit-cycle oscillations close to the transonic dip | ||||||||
Autoren: |
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Datum: | Mai 2006 | ||||||||
Erschienen in: | Journal of Fluids and Structures | ||||||||
Open Access: | Nein | ||||||||
In SCOPUS: | Nein | ||||||||
In ISI Web of Science: | Ja | ||||||||
Band: | 22 | ||||||||
Seitenbereich: | Seiten 505-527 | ||||||||
Verlag: | Elsevier | ||||||||
Stichwörter: | limit-cycle oscillations, transonic dip, flutter, supercritical airfoil | ||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||
Standort: | Göttingen | ||||||||
Institute & Einrichtungen: | Institut für Aeroelastik |
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