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Effect of forward-facing steps on boundary-layer transition in combination with stability modifiers

Costantini, Marco (2015) Effect of forward-facing steps on boundary-layer transition in combination with stability modifiers. AIA Seminar, 28. Mai 2015, Aachen, Deutschland.

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Abstract

Experiments were conducted up to high subsonic Mach number in the Cryogenic Ludwieg-Tube Göttingen to study the influence of surface imperfections on boundary layer transition. Forward-facing steps of different height were installed on two spanwise-invariant wind tunnel models and their effect on transition was examined at high chord Reynolds numbers, various streamwise pressure gradients, and different wall temperature ratios. Transition, detected non-intrusively by means of the Temperature-Sensitive Paint technique, was found to gradually move towards the step location with increasing step Reynolds numbers and relative step height. Larger flow acceleration and reduced wall temperature ratios had a favorable influence on the transition Reynolds number even in the presence of forward-facing steps, but their effect was less pronounced as the step Reynolds number was increased. The plots of the relative change in transition location as a function of the step Reynolds number gave good correlation of the results obtained at all examined Mach numbers and with both wind tunnel models.

Item URL in elib:https://elib.dlr.de/96420/
Document Type:Conference or Workshop Item (Speech)
Title:Effect of forward-facing steps on boundary-layer transition in combination with stability modifiers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costantini, MarcoMarco.Costantini (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Boundary layer transition; forward-facing steps; Temperature-Sensitive Paint
Event Title:AIA Seminar
Event Location:Aachen, Deutschland
Event Type:Other
Event Dates:28. Mai 2015
Organizer:RWTH Aachen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:16 Jun 2015 10:54
Last Modified:16 Jun 2015 10:54

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