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Non-adiabatic surface effects on step-induced boundary-layer transition

Costantini, Marco and Risius, Steffen and Klein, Christian (2018) Non-adiabatic surface effects on step-induced boundary-layer transition. Flow Turbulence and Combustion, 100 (4), pp. 1145-1177. Springer. doi: 10.1007/s10494-018-9913-7. ISSN 1386-6184.

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Official URL: https://doi.org/10.1007/s10494-018-9913-7


The effect on step-induced boundary-layer transition of surface temperatures different from the adiabatic-wall temperature was investigated for a (quasi-) two-dimensional flow at large Reynolds numbers and at both low and high subsonic Mach numbers. Sharp forward-facing steps were mounted on a flat plate and transition was studied non-intrusively by means of the temperature-sensitive paint technique. The experiments were conducted in the Cryogenic Ludwieg-Tube Göttingen with various streamwise pressure gradients and temperature differences between flow and model surface. A reduction of the ratio between surface and adiabatic-wall temperatures had a favorable influence on step-induced transition up to moderate values of the step Reynolds number and of the step height relative to the boundary-layer displacement thickness, leading to larger transition Reynolds numbers. However, at larger values of the non-dimensional step parameters, the increase in transition Reynolds number for a given reduction in the wall temperature ratio became smaller. Transition was found to be insensitive to changes in the wall temperature ratio for step Reynolds numbers above a certain value. Up to this limiting value, the relation between the relative change in transition location (with respect to its value for a smooth surface) and the non-dimensional step parameter was essentially unaffected by variations in the wall temperature ratio. The present choice of non-dimensional parameters allows the effect of the steps on transition to be isolated from the influence of variations in the other factors, provided that both transition locations on the step and smooth configurations are measured at the same conditions.

Item URL in elib:https://elib.dlr.de/120910/
Document Type:Article
Additional Information:Published online: 03 May 2018, Online ISSN: 1573-1987
Title:Non-adiabatic surface effects on step-induced boundary-layer transition
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Risius, Steffensteffen.risius (at) dlr.deUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.deUNSPECIFIED
Journal or Publication Title:Flow Turbulence and Combustion
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s10494-018-9913-7
Page Range:pp. 1145-1177
Keywords:Transition, Step, Non-adiabatic surface, Temperature-sensitive paint, Boundary layer, Surface imperfection, Natural laminar flow, TSP
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 (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:11 Jul 2018 13:48
Last Modified:06 Sep 2019 15:21

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