Weiss, Armin und Gardner, Anthony und Schwermer, Till und Klein, Christian und Raffel, Markus (2018) On the Effect of Rotational Forces on Rotor Blade Boundary-Layer Transition. In: 2018 AIAA Aerospace Sciences Meeting, Seiten 1-17. AIAA SciTech Forum 2018, 2018-01-07 - 2018-01-11, Kissimee, Florida USA. doi: 10.2514/6.2018-0309.
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Offizielle URL: https://arc.aiaa.org/doi/10.2514/6.2018-0309
Kurzfassung
Laminar-turbulent boundary-layer transition is investigated on the suction side of Mach-scaled helicopter rotor blades in climb and analyzed in view of the effect of rotational forces. Spatially highly resolved data and precisely detected transition positions are obtained by means of temperature-sensitive paint and accompanied by local surface pressure measurements at two radial blade sections. The effect of rotational forces is investigated by systematic variation of Rossby number from Ro = 4.76 to 6.95 at Re = 3.7x10^5 and M = 0.22. The findings do not show a measurable effect of rotational forces on boundary-layer transition in the investigated parameter range and suggest predominantly two-dimensional (2D) flow behaviour, which is confirmed by subsequent validation with 2D numerical tools. Based on quantitative agreement between measured and calculated surface pressures, it is shown that experimentally detected transition positions are predicted to within +-4 % chord if a critical amplification factor of N_cr,MSES = 5.6 is used in MSES for transition prediction in the rotor test facility of the DLR Göttingen. The measured transition onset positions are also correlated with the obtained integral growth rates from 2D compressible local linear stability theory to get transition N-factors of N_cr = 8.4 + 0.5 . Correlations are shown to be independent of relative chord Reynolds number and incompressible shape factor at the detected transition onset underlining the capability of 2D numerical techniques based on linear stability theory to model boundary-layer transition in the investigated parameter range.
elib-URL des Eintrags: | https://elib.dlr.de/119037/ | ||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||
Zusätzliche Informationen: | AIAA SciTech Forum; 2018 AIAA Aerospace Sciences Meeting; Copyright 2018 by Armin Weiss; Published by the American Institute of Aeronautics an Astronautics, Inc., with permission; https://scitech.aiaa.org | ||||||||||||||||||||||||
Titel: | On the Effect of Rotational Forces on Rotor Blade Boundary-Layer Transition | ||||||||||||||||||||||||
Autoren: |
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Datum: | 2018 | ||||||||||||||||||||||||
Erschienen in: | 2018 AIAA Aerospace Sciences Meeting | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
DOI: | 10.2514/6.2018-0309 | ||||||||||||||||||||||||
Seitenbereich: | Seiten 1-17 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | boundary-layer transition, helicopter rotor blades, rotational effects, temperature-sensitive paint, e^N method | ||||||||||||||||||||||||
Veranstaltungstitel: | AIAA SciTech Forum 2018 | ||||||||||||||||||||||||
Veranstaltungsort: | Kissimee, Florida USA | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 7 Januar 2018 | ||||||||||||||||||||||||
Veranstaltungsende: | 11 Januar 2018 | ||||||||||||||||||||||||
Veranstalter : | American Institute of Aeronautics and Astronautics | ||||||||||||||||||||||||
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 - Simulation und Validierung (alt) | ||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO | ||||||||||||||||||||||||
Hinterlegt von: | Bachmann, Barbara | ||||||||||||||||||||||||
Hinterlegt am: | 20 Mär 2018 15:32 | ||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:23 |
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