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Step-induced transition in compressible flow: experimental results and correlation with stability analysis

Costantini, Marco and Risius, Steffen and Klein, Christian (2018) Step-induced transition in compressible flow: experimental results and correlation with stability analysis. In: ECCM-ECFD 2018 (a322), pp. 1-2. ECCM-ECFD 2018, 11.-15.06.2018, Glasgow, UK.

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Official URL: http://www.eccm-ecfd2018.org/admin/files/fileabstract/a322.pdf

Abstract

Practical laminar flow wing design requires joints, panels and high-lift devices, but steps and/or gaps would arise at the junctions and can lead to premature transition to turbulence. The effect of sharp forward-facing steps on boundary-layer transition was systematically investigated in this 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. 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. The measured transition locations were also correlated with the results of linear local stability analysis for the smooth configuration, following the procedure suggested in previous work to account for the effect of steps in the eN method for transition prediction.

Item URL in elib:https://elib.dlr.de/122190/
Document Type:Conference or Workshop Item (Speech)
Additional Information:"Volltext" ist das Abstract (1 Seite)
Title:Step-induced transition in compressible flow: experimental results and correlation with stability analysis
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
Klein, Christianchristian.klein (at) dlr.deUNSPECIFIED
Date:14 June 2018
Journal or Publication Title:ECCM-ECFD 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-2
Series Name:Conference Proceedings online
Status:Published
Keywords:Step, Transition, Surface Imperfections, Boundary Layer, Laminar Wing
Event Title:ECCM-ECFD 2018
Event Location:Glasgow, UK
Event Type:international Conference
Event Dates:11.-15.06.2018
Organizer:ECCOMAS
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:10 Jan 2019 13:48
Last Modified:10 Jan 2019 13:48

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