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Experimental analysis of suction on step-induced boundary-layer transition

Dimond, Benjamin and Costantini, Marco and Risius, Steffen and Fuchs, Carsten and Klein, Christian (2019) Experimental analysis of suction on step-induced boundary-layer transition. Experimental Thermal and Fluid Science, 109 (109842), 1 - 11. Elsevier. DOI: 10.1016/j.expthermflusci.2019.109842 ISSN 0894-1777

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Official URL: https://doi.org/10.1016/j.expthermflusci.2019.109842

Abstract

The influence of suction on step-induced boundary-layer transition has been experimentally investigated in the Cryogenic Ludwieg-Tube Goettingen at large chord Reynolds numbers (up to 16·106), Mach numbers from 0.35 to 0.77 and various streamwise pressure gradients by means of temperature-sensitive paint. Surface imperfections, implemented as combination of gap and forward-facing step, caused transition to occur at a location more upstream than in the case of a smooth surface (i.e. without gap and step). For this combination of imperfections, it was demonstrated for the first time in experiments 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 without suction, and in most cases even more downstream 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 for the investigated test conditions.

Item URL in elib:https://elib.dlr.de/128989/
Document Type:Article
Additional Information:Dec. 2019, Available online: 10.06.2019
Title:Experimental analysis of suction on step-induced boundary-layer transition
Authors:
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
Fuchs, Carstencarsten.fuchs (at) dlr.deUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Date:December 2019
Journal or Publication Title:Experimental Thermal and Fluid Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:109
DOI :10.1016/j.expthermflusci.2019.109842
Page Range:1 - 11
Editors:
EditorsEmail
Yarusevych, Serhiysyarus@uwaterloo.ca
Kähler, Christian J.christian.kaehler@unibw.de
Publisher:Elsevier
ISSN:0894-1777
Status:Published
Keywords:Laminar-Turbulent Transition, Suction, Surface Imperfections, Temperature-Sensitive Paint
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
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
Deposited By: Micknaus, Ilka
Deposited On:09 Oct 2019 15:41
Last Modified:09 Oct 2019 15:41

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