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Experimental investigation of the effect of forward-facing steps on boundary layer transition

Costantini, Marco and Risius, Steffen and Klein, Christian (2015) Experimental investigation of the effect of forward-facing steps on boundary layer transition. Procedia IUTAM, 14 (10). ELSEVER. ISSN 2212-0173

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Official URL: http://www.sciencedirect.com/science/article/pii/S2210983815000620

Abstract

The effect of geometric forward-facing steps on boundary layer transition was experimentally investigated at a high subsonic Mach number in a blow-down wind tunnel facility in Göttingen, Germany. Boundary layer transition was detected non-intrusively by means of the Temperature-Sensitive Paint (TSP) technique. Forward-facing steps of different height were installed on a spanwise invariant wind tunnel model. Streamwise pressure gradient and high chord Reynolds number were systematically varied and their effect on boundary layer transition was studied in the presence of forward-facing steps on the model surface. For all tested stability situations, the surface imperfections were shown to reduce the extent of the laminar region. Transition was observed to move gradually towards the step location for increasing step Reynolds numbers and increasing relative step height. For a given combination of step height and chord Reynolds number, more pronounced negative pressure gradients led to an increase in transition Reynolds number. The reduction in transition Reynolds due to the effect of the surface imperfection was observed to be more marked at larger flow acceleration. The plots of the relative change in transition location as a function of the step Reynolds number and of the relative step height gave good correlation of the results. The correlations were found to be practically independent of the streamwise pressure gradient in the examined range. Criteria for the allowable tolerances on low-sweep Natural Laminar Flow surfaces are derived from the functional relations determined in this work.

Item URL in elib:https://elib.dlr.de/90731/
Document Type:Proceedings
Additional Information:Section 4: Roughness, particles and corner effect on transition, Available online 2 July 2015, ScienceDirect
Title:Experimental investigation of the effect of forward-facing steps on boundary layer transition
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costantini, MarcoMarco.Costantini (at) dlr.deUNSPECIFIED
Risius, Steffensteffen.risius (at) dlr.deUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:14
DOI :10.1016/j.piutam.2015.03.036
Page Range:pp. 152-162
Publisher:ELSEVER
Series Name:Procedia IUTAM
ISSN:2212-0173
Status:Published
Keywords:Boundary layer transition; forward-facing steps; Temperature-Sensitive Paint
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 of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:09 Oct 2015 10:03
Last Modified:22 Jan 2018 14:57

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