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Crossflow-Induced Transition Prediction Using Coupled Navier-Stokes and e(N) Method Computations

Stock, H.W. und Seitz, A. (2004) Crossflow-Induced Transition Prediction Using Coupled Navier-Stokes and e(N) Method Computations. AIAA-Journal, 42 (9), Seiten 1746-1754.

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Kurzfassung

The flow around two infinite swept wings and an infinite swept cylinder model is computed using a Reynolds averaged Navier-Stokes method coupled to a boundary-layer and transition prediction method based on the e(N) approach. The configurations were wind-tunnel tested, including transition location measurements. In all test cases, transition is provoked purely by crossflow instabilities. The infinite swept wing experiments represent critical test cases because they contradict two assumptions made in the conventional e(N) approach, where the limiting cross-flow N factor is supposed to be independent of the surface curvature and the quality of the wing surface finish. It will be shown that the extended version of the e(N)- method can resolve this problem and produce acceptable results. The infinite swept cylinder model tested at high sweep angles between 53 and 71 deg is excellently suited to demonstrate that the e(N)-method is capable of describing the leading-edge contamination problem. For sweep angles between 53 and 58 deg, a relative constant limiting crossflow N factor exists, whereas for higher sweep angles the crossflow N factors at the measured transition location decrease gradually. Applying the leading-edge contamination criterion of Pfenninger, the e(N)-method predicts the sweep angle, where leading-edge contamination starts to influence the laminar boundary-layer flow. Furthermore, the sweep angle, which produces, according to an empirical correlation, fully turbulent leading-edge flows, is well predicted by the e(N)-method.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2004,
Titel:Crossflow-Induced Transition Prediction Using Coupled Navier-Stokes and e(N) Method Computations
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Stock, H.W.NICHT SPEZIFIZIERT
Seitz, A.NICHT SPEZIFIZIERT
Datum:2004
Erschienen in:AIAA-Journal
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:42
Seitenbereich:Seiten 1746-1754
Status:veröffentlicht
Stichwörter:transition prediction, RANS, crossflow instability, n-factor, e(N)-method
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Claudia Grant
Hinterlegt am:31 Jan 2006
Letzte Änderung:14 Jan 2010 19:37

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