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Generation of unsteady CF-instability modes by vibrational and vibration-vortex localized receptivity mechanisms

Kachanov, Y. S. und Borodulin, V. I. und Ivanov, A. V. und Mischenko, D. A. und Örlü, R. und Hanifi, Ardeshir und Hein, Stefan (2018) Generation of unsteady CF-instability modes by vibrational and vibration-vortex localized receptivity mechanisms. In: AIP Conference Proceedings, 2027 (020010). American Institute of Physics. 19th International Conference on the Methods of Aerophysical Research (ICMAR), 2018-08-13 - 2018-08-19, Novosibirsk, Russia. doi: 10.1063/1.5065088.

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Offizielle URL: https://doi.org/10.1063/1.5065088

Kurzfassung

The paper is based on results obtained within an international project ‘RECEPT’ of the European Framework Program FP7. The experiments were carried out in a three-dimensional boundary layer developing on an experimental model of a long-laminar-run swept airfoil (sweep angle of 35°). The model was mounted in a test section of the lowturbulence wind-tunnel MTL (KTH, Stockholm) at an angle of attack of −5° and equipped with sidewalls provided satisfaction of infinite-span conditions. The cross-flow (CF) instability modes were predominant in this case, while the Tollmien–Schlichting (TS) waves were suppressed by a favorable pressure gradient. The main measurements were carried out by means of hot-wire anemometry at conditions of excitation of fully controlled, unsteady surface and flow perturbations. These perturbations were excited by special sources: (1) a row of oscillating membranes and (2) a vibrating wire, at frequencies of fs and fv, respectively. A very good, quantitative agreement between the measured and calculated (by linear stability theory based on PSE approach) amplification curves was found at surface frequency fs. However, the evolution of the CF-modes excited at difference combination frequency fsv– = fs – fv turned out to be very much different from the theoretical one. Thorough analysis of the obtained results has shown that the only explanation of these discrepancies can be associated with presence of a distributed receptivity mechanism due to scattering of freestream vortices on the CF-instability waves excited by surface vibrations. Another unusual and unexpected phenomenon found in the present experiments is associated with anomalous amplification of difference combination modes with the zero spanwise wavenumbers E′. This phenomenon was observed in the flow, which is stable with respect to both CF- and TSwaves having E′ = 0 for all frequencies. There is no explanation of this finding at present.

elib-URL des Eintrags:https://elib.dlr.de/118590/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Generation of unsteady CF-instability modes by vibrational and vibration-vortex localized receptivity mechanisms
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Kachanov, Y. S.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Borodulin, V. I.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ivanov, A. V.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mischenko, D. A.Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, RussiaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Örlü, R.KTH, Stockholm, SchwedenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hanifi, ArdeshirKTH StockholmNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hein, StefanDLR GöttingenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2 November 2018
Erschienen in:AIP Conference Proceedings
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Ja
Band:2027
DOI:10.1063/1.5065088
Verlag:American Institute of Physics
Status:veröffentlicht
Stichwörter:laminar-turbulent transition, three-dimensional boundary layer, EU project RECEPT
Veranstaltungstitel:19th International Conference on the Methods of Aerophysical Research (ICMAR)
Veranstaltungsort:Novosibirsk, Russia
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:13 August 2018
Veranstaltungsende:19 August 2018
Veranstalter :American Institute of Physics
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hochgeschwindigkeitskonfigurationen, GO
Hinterlegt von: Hein, Dr.-Ing. Stefan
Hinterlegt am:27 Sep 2018 13:43
Letzte Änderung:24 Apr 2024 20:22

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