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Experimental analysis of the effect of suction and step height on boundary-layer transition

Dimond, Benjamin and Costantini, Marco and Klein, Christian (2021) Experimental analysis of the effect of suction and step height on boundary-layer transition. In: IUTAM Laminar-Turbulent Transition: 9th IUTAM Symposium, 38, pp. 171-180. Springer. IUTAM Symposium on Laminar-Turbulent Transition, 02.-06. September 2019, London, UK. doi: 10.1007/978-3-030-67902-6_14. ISBN 978-3-030-67902-6. ISSN 1875-3507.

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Official URL: https://doi.org/10.1007/978-3-030-67902-6_14

Abstract

Laminar flow is challenging to maintain in the presence of surface imperfections such as steps and/or gaps, which can occur at structural joints. A substantial stream-wise delay of laminar-turbulent transition, however, can be achieved with boundary-layer suction. This work examines the delay of transition that can be obtained with slit suction. Imperfections such as forward-facing steps and backward-facing steps in combination with stream-wise gaps are studied. Systematic experimental investigations were performed in the low-turbulence Cryogenic Ludwieg-Tube Göttingen for large Reynolds numbers (chord Reynolds numbers up to Rec=16⋅106), Mach numbers 0.35≤M≤0.77 and various streamwise pressure gradients. Suction proves to delay transition significantly and even overcompensates the adverse effect of surface imperfections. With suction, transition locations for backward-facing steps were measured even further downstream than for similar sized forward-facing steps.

Item URL in elib:https://elib.dlr.de/129301/
Document Type:Conference or Workshop Item (Poster)
Additional Information:Hardcover ISBN 978-3-030-67901-9 Softcover ISBN 978-3-030-67904-0 eBook ISBN 978-3-030-67902-6 Series ISSN 1875-3507 Series E-ISSN 1875-3493
Title:Experimental analysis of the effect of suction and step height on boundary-layer transition
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Dimond, Benjaminbenjamin.dimond (at) dlr.deUNSPECIFIED
Costantini, Marcomarco.costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Date:31 July 2021
Journal or Publication Title:IUTAM Laminar-Turbulent Transition: 9th IUTAM Symposium
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:38
DOI :10.1007/978-3-030-67902-6_14
Page Range:pp. 171-180
Editors:
EditorsEmailEditor's ORCID iD
Sherwin, SpencerImperial College London, UKUNSPECIFIED
Schmid, PeterImperial College London, UKUNSPECIFIED
Wu, XuesongImperial College London, UKUNSPECIFIED
Publisher:Springer
Series Name:IUTAM BOOK Series
ISSN:1875-3507
ISBN:978-3-030-67902-6
Status:Published
Keywords:Laminar-Turbulent Transition, Suction, Surface Imperfections, Temperature-Sensitive Paint
Event Title:IUTAM Symposium on Laminar-Turbulent Transition
Event Location:London, UK
Event Type:international Conference
Event Dates:02.-06. September 2019
Organizer:Imperial College London
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:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:11 Oct 2019 13:38
Last Modified:13 Jan 2022 09:50

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