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Experimental analysis of step-induced transition in compressible high Reynolds number flow

Costantini, Marco und Risius, Steffen und Klein, Christian (2017) Experimental analysis of step-induced transition in compressible high Reynolds number flow. 12th ERCOFTAC SIG 33 Workshop, Progress in Flow lnstability, Transition and Control, 2017-06-19 - 2017-06-21, Certosa di Pontignano, Italien.

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Offizielle URL: http://www.ercoftac.org/special_interest_groups/33_transition_mechanisms_prediction_and_control/past_technical_programme/newpage/

Kurzfassung

The effect of sharp forward-facing steps on boundary-layer transition was systematically investigated in this experimental work in combination with the influence of variations in the following parameters: streamwise pressure gradient, Reynolds number, Mach number, and wall temperature ratio. The experiments were conducted in a quasi-two-dimensional flow at high Reynolds numbers and at both low and high subsonic Mach numbers in the Cryogenic Ludwieg-Tube Göttingen. The adopted experimental setup enabled an independent variation of the aforementioned parameters and allowed a decoupling of their respective effects on the boundary-layer transition. Transition, measured non-intrusively by means of temperature-sensitive paint, was found to move gradually upstream towards the step location with increasing non-dimensional step parameters. Stronger flow acceleration and lower wall temperature ratios led to an increase in the transition Reynolds number even in the presence of forward-facing steps; this favorable influence became, however, less pronounced at !arger values of the non-dimensional step parameters. The representation of the results using the relative change in transition location with respect to the step location, plotted against the non-dimensional step parameters, gave good correlation. The effect of the steps on boundary-layer transition could thus be systematically investigated, being isolated from the influence of variations in the other parameters.

elib-URL des Eintrags:https://elib.dlr.de/118004/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Experimental analysis of step-induced transition in compressible high Reynolds number flow
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199134173742
Risius, Steffensteffen.risius (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Klein, ChristianChristian.Klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922NICHT SPEZIFIZIERT
Datum:2017
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:boundary layer, transition, step, temperature-sensitive paint
Veranstaltungstitel:12th ERCOFTAC SIG 33 Workshop, Progress in Flow lnstability, Transition and Control
Veranstaltungsort:Certosa di Pontignano, Italien
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:19 Juni 2017
Veranstaltungsende:21 Juni 2017
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
Hinterlegt von: Bachmann, Barbara
Hinterlegt am:11 Jan 2018 08:45
Letzte Änderung:24 Apr 2024 20:22

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