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Experimental analysis of step-induced transition in compressible high Reynolds number flow

Costantini, Marco and Risius, Steffen and Klein, Christian (2017) Experimental analysis of step-induced transition in compressible high Reynolds number flow. 12th ERCOFTAC SIG 33 Workshop, Progress in Flow lnstability, Transition and Control, 19.-21. Juni 2017, Certosa di Pontignano, Italien.

Full text not available from this repository.

Official URL: http://www.ercoftac.org/special_interest_groups/33_transition_mechanisms_prediction_and_control/past_technical_programme/newpage/

Abstract

The effect of sharp forward-facing steps on boundary-layer transition was systematically investigated in this experimental 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. The adopted experimental setup enabled an independent variation of the aforementioned parameters and allowed a decoupling of their respective effects on the boundary-layer transition. 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. Stronger flow acceleration and lower wall temperature ratios led to an increase in the transition Reynolds number even in the presence of forward-facing steps; this favorable influence became, however, less pronounced at !arger values of the non-dimensional step parameters. The representation of the results using the relative change in transition location with respect to the step location, plotted against the non-dimensional step parameters, gave good correlation. The effect of the steps on boundary-layer transition could thus be systematically investigated, being isolated from the influence of variations in the other parameters.

Item URL in elib:https://elib.dlr.de/118004/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental analysis of step-induced 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.deUNSPECIFIED
Klein, ChristianChristian.Klein (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:boundary layer, transition, step, temperature-sensitive paint
Event Title:12th ERCOFTAC SIG 33 Workshop, Progress in Flow lnstability, Transition and Control
Event Location:Certosa di Pontignano, Italien
Event Type:international Conference
Event Dates:19.-21. Juni 2017
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: Bachmann, Barbara
Deposited On:11 Jan 2018 08:45
Last Modified:11 Jan 2018 08:45

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