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Experimental investigation of the effect of forward-facing steps on boundary layer transition

Costantini, Marco und Risius, Steffen und Klein, Christian (2015) Experimental investigation of the effect of forward-facing steps on boundary layer transition. Procedia IUTAM, 14 (10). ELSEVER. doi: 10.1016/j.piutam.2015.03.036. ISSN 2212-0173.

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Offizielle URL: http://www.sciencedirect.com/science/article/pii/S2210983815000620

Kurzfassung

The effect of geometric forward-facing steps on boundary layer transition was experimentally investigated at a high subsonic Mach number in a blow-down wind tunnel facility in Göttingen, Germany. Boundary layer transition was detected non-intrusively by means of the Temperature-Sensitive Paint (TSP) technique. Forward-facing steps of different height were installed on a spanwise invariant wind tunnel model. Streamwise pressure gradient and high chord Reynolds number were systematically varied and their effect on boundary layer transition was studied in the presence of forward-facing steps on the model surface. For all tested stability situations, the surface imperfections were shown to reduce the extent of the laminar region. Transition was observed to move gradually towards the step location for increasing step Reynolds numbers and increasing relative step height. For a given combination of step height and chord Reynolds number, more pronounced negative pressure gradients led to an increase in transition Reynolds number. The reduction in transition Reynolds due to the effect of the surface imperfection was observed to be more marked at larger flow acceleration. The plots of the relative change in transition location as a function of the step Reynolds number and of the relative step height gave good correlation of the results. The correlations were found to be practically independent of the streamwise pressure gradient in the examined range. Criteria for the allowable tolerances on low-sweep Natural Laminar Flow surfaces are derived from the functional relations determined in this work.

elib-URL des Eintrags:https://elib.dlr.de/90731/
Dokumentart:Tagungsband
Zusätzliche Informationen:Section 4: Roughness, particles and corner effect on transition, Available online 2 July 2015, ScienceDirect
Titel:Experimental investigation of the effect of forward-facing steps on boundary layer transition
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199134173718
Risius, Steffensteffen.risius (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922NICHT SPEZIFIZIERT
Datum:2015
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:14
DOI:10.1016/j.piutam.2015.03.036
Seitenbereich:Seiten 152-162
Verlag:ELSEVER
Name der Reihe:Procedia IUTAM
ISSN:2212-0173
Status:veröffentlicht
Stichwörter:Boundary layer transition; forward-facing steps; Temperature-Sensitive Paint
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
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:09 Okt 2015 10:03
Letzte Änderung:24 Apr 2024 19:56

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