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Experimental investigation of step-induced transition delay by means of suction

Dimond, Benjamin and Costantini, Marco and Risius, Steffen and Klein, Christian and Rein, Martin (2018) Experimental investigation of step-induced transition delay by means of suction. In: 21th STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, pp. 56-57. 21. STAB/DGLR Symposium 2018, 06.-07.11.2018, Darmstadt, Deutschland.

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The influence of different suction rates on step-induced boundary-layer transition has been experimentally investigated in the Cryogenic Ludwieg-Tube Goettingen at large chord Reynolds numbers (up to 16 Million), Mach numbers from 0.35 to 0.77 and various stream wise pressure gradients by means of Temperature-Sensitive Paint (TSP). A surface imperfection, implemented as combination of gap and forward facing step, caused transition to occur at a location more upstream than in case of a smooth surface (i.e. without gap and step). It was found that suction, achieved passively by exploiting the pressure difference between upper and lower side of the model, induced a movement of transition to a more downstream location than on the smooth configuration at the same test conditions. Thus, the effect of suction was to even overcompensate the adverse effect of the combination of gap and forward-facing step on boundary-layer transition. This effect was enhanced for higher suction rates.

Item URL in elib:https://elib.dlr.de/122973/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental investigation of step-induced transition delay by means of suction
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dimond, Benjaminbenjamin.dimond (at) dlr.deUNSPECIFIED
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Risius, Steffensteffen.risius (at) dlr.dehttps://orcid.org/0000-0002-5530-9609
Klein, Christianchristian.klein (at) dlr.deUNSPECIFIED
Rein, Martinmartin.rein (at) dlr.deUNSPECIFIED
Date:November 2018
Journal or Publication Title:21th STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 56-57
Keywords:Laminar-Turbulent Transition, Suction, Surface Imperfections, Temperature-Sensitive Paint
Event Title:21. STAB/DGLR Symposium 2018
Event Location:Darmstadt, Deutschland
Event Type:national Conference
Event Dates:06.-07.11.2018
Organizer:Technische Universität Darmstadt, STAB
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV / AS-HGK
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 for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Micknaus, Ilka
Deposited On:03 Dec 2018 14:25
Last Modified:03 Dec 2018 14:25

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