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Non-adiabatic surface effects on step-induced boundary-layer transition at a subsonic Mach number

Costantini, Marco and Risius, Steffen and Klein, Christian (2017) Non-adiabatic surface effects on step-induced boundary-layer transition at a subsonic Mach number. European Drag Reduction and Flow Control Meeting - EDRFCM 2017, 03.-06. Apr. 2017, Rom, Italien.

Full text not available from this repository.

Official URL: http://www.ercoftac.org/special_interest_groups/20_drag_reduction_and_flow_control/upcoming_events/newpage/

Abstract

The effect on step-induced transition of surface temperatures T w different from the adiabatic-wall temperature T0w has been investigated in this work. Experiments were conducted in a (quasi-) two­dimensional flow at a freestream Mach number of M = 0.35 and chord Reynolds numbers up to Re = 10 · 106 with various streamwise pressure gradients and wall temperature ratios T .JTaw· Sharp forward-facing steps were mounted on a spanwise-invariant wind-tunnel model and studied in the Cryogenic Ludwieg­Tube Göttingen. Transition was detected non-intrusively by means of the Temperature-Sensitive Paint measurement technique. A reduction of the wall temperature ratio had a favorable influence on boundary-layer transition induced by forward-facing steps up to a certain value of the relative step height h/61.h, although the increase in transition Reynolds number for a given reduction in T ,)T0w was smaller at la:ger values of h/61.h. Above a certain value of h/61.h, tne influence of a reduction in the wall temperature ratio on boundary-layer transition became dependent on the transition location measured at !arger T jT0w.

Item URL in elib:https://elib.dlr.de/118003/
Document Type:Conference or Workshop Item (Speech)
Title:Non-adiabatic surface effects on step-induced boundary-layer transition at a subsonic Mach number
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, non-adiabatic surface, step, temperature-sensitive paint
Event Title:European Drag Reduction and Flow Control Meeting - EDRFCM 2017
Event Location:Rom, Italien
Event Type:international Conference
Event Dates:03.-06. Apr. 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 08:44
Last Modified:11 Jan 2018 08:44

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