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Experimental study of bump effects on boundary ­layer transition in compressible high Reynolds number flow

Costantini, Marco and Risius, Steffen and Koch, Stefan and Gerhard, Uwe and Hein, Stefan and Klein, Christian (2018) Experimental study of bump effects on boundary ­layer transition in compressible high Reynolds number flow. In: 5th Internatinal Conference on Experimental Fluid Mechanics 2018 (16), pp. 161-166. Institute of Fluid Mechanics and Aerodynamics, Universität der Bunderwehr München, Germany. 5th International Conference on Experimental Fluid Mechanics 2018, 02.-04. Juli 2018, München, Germany. DOI: 10.18726/2018_2 ISBN 978-3-943207-32-3

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Official URL: https://athene-forschung.unibw.de/124421

Abstract

The influence of surface bumps on boundary-layer transition was experimentally investigated in the present work. The experiments were conducted in a (quasi-) two-dimensional flow at freestream Mach numbers up to M = 0.77 and chord Reynolds numbers up to Re= 10 millions in the low-turbulence Cryogenic Ludwieg-Tube Göttingen. Various streamwise pressure gradients relevant for natural laminar flow surfaces were implemented. An available two-dimensional flat-plate model was modified to accept exchangeable inserts on the model upper side. The quasi-two-dimensional surface bumps were manufactured on the inserts and had a sinusoidal shape in the streamwise direction. Three bumps with different height-to-length ratio were examined. The model was equipped with temperature-sensitive paint for non-intrusive transition detection and with pressure taps for the measurement of the surface pressure distributions. Natural transition was shown to occur at a more upstream location with increasing bump height-to-length ratio.

Item URL in elib:https://elib.dlr.de/119079/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://athene-orschung.unibw.de/doc/124421/124421.pdf Link für Conference Proceedings
Title:Experimental study of bump effects on boundary ­layer transition in compressible high Reynolds number flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Risius, Steffensteffen.risius (at) dlr.dehttps://orcid.org/0000-0002-5530-9609
Koch, StefanStefan.Koch (at) dlr.deUNSPECIFIED
Gerhard, UweAS-GO-HGKUNSPECIFIED
Hein, StefanStefan.Hein (at) dlr.deUNSPECIFIED
Klein, ChristianChristian.Klein (at) dlr.deUNSPECIFIED
Date:2018
Journal or Publication Title:5th Internatinal Conference on Experimental Fluid Mechanics 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.18726/2018_2
Page Range:pp. 161-166
Editors:
EditorsEmail
Kähler, ChristianUniBW München
Hain, RainerUNSPECIFIED
Scharnowski, SvenUNSPECIFIED
Fuchs, ThomasUNSPECIFIED
Publisher:Institute of Fluid Mechanics and Aerodynamics, Universität der Bunderwehr München, Germany
Series Name:Conference Proceedings online
ISBN:978-3-943207-32-3
Status:Published
Keywords:Bump, Transition, Temperature-Sensitive Paint, Boundary Layer
Event Title:5th International Conference on Experimental Fluid Mechanics 2018
Event Location:München, Germany
Event Type:international Conference
Event Dates:02.-04. Juli 2018
Organizer:Universität der Bundeswehr München
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 16:11
Last Modified:10 Jan 2019 03:12

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