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On the Effect of Rotational Forces on Rotor Blade Boundary-Layer Transition

Weiss, Armin und Gardner, Anthony D. und Schwermer, Till und Klein, Christian und Raffel, Markus (2019) On the Effect of Rotational Forces on Rotor Blade Boundary-Layer Transition. AIAA Journal, 57 (1), Seiten 252-266. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J057036. ISSN 0001-1452.

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Offizielle URL: https://arc.aiaa.org/doi/10.2514/1.J057036

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. Transition positions are detected with temperature-sensitive paint and complemented by surface pressure measurements at two radial blade sections. The effect of rotational forces is investigated by systematic variation of the Rossby number from Ro = 4.76 to Ro = 6.95 at Re = 3.7 x 10^5 and M = 0.22. The findings do not show a significant effect on boundary-layer transition in the investigated parameter range and suggest predominantly two-dimensional flow behavior. The result is supported by subsequent validation with two-dimensional numerical tools. Based on quantitative agreement between measured and calculated surface pressures, measured transition positions are predicted to within ±4% chord if a critical amplification factor of N_{cr,MSES} = 5.6 is used in the coupled Euler/boundary-layer equation solver MSES for transition prediction in the rotor test facility of the DLR, German Aerospace Center in Göttingen, Germany. The measured transition onset positions are also correlated with integral growth rates, obtained from separate two-dimensional compressible boundary-layer computations and subsequent local linear stability analysis to get transition N factors of N_{cr} = 8.4 ± 0.5. Differences in N factors are discussed in view of the different approaches used. Overall, transition N-factor correlations are independent of relative chord Reynolds number and incompressible shape factor at the detected transition onset. The findings underline the capability of two-dimensional 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/119088/
Dokumentart:Zeitschriftenbeitrag
Titel:On the Effect of Rotational Forces on Rotor Blade Boundary-Layer Transition
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Weiss, ArminArmin.Weiss (at) dlr.dehttps://orcid.org/0000-0002-7532-2974NICHT SPEZIFIZIERT
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447NICHT SPEZIFIZIERT
Schwermer, TillTill.Schwermer (at) alumni-uni-hannover.dehttps://orcid.org/0000-0002-6918-4480NICHT SPEZIFIZIERT
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922NICHT SPEZIFIZIERT
Raffel, Markusmarkus.raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115133716012
Datum:Januar 2019
Erschienen in:AIAA Journal
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:57
DOI:10.2514/1.J057036
Seitenbereich:Seiten 252-266
Verlag:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:veröffentlicht
Stichwörter:boundary-layer transition, rotational effect, rotating blades, temperature-sensitive paint
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Hubschrauber
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L RR - Rotorcraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Der virtuelle Drehflügler (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO
Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO
Hinterlegt von: Winkels, Elisabeth
Hinterlegt am:08 Jan 2019 02:47
Letzte Änderung:31 Okt 2023 15:12

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