elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Experimental investigation of unit Reynolds number and pressure gradient effects on two-dimensional boundary layer transition

Risius, Steffen and Costantini, Marco and Hein, Stefan and Klein, Christian (2017) Experimental investigation of unit Reynolds number and pressure gradient effects on two-dimensional boundary layer transition. 17th ONERA-DLR Aerospace Symposium, 07.-09. Jun. 2017, Aussois, Frankreich.

Full text not available from this repository.

Abstract

Natural laminar flow technology is a promising way to reduce wall shear stress and fuel consumption of commercial aircraft. In low free-stream disturbance environments, as encountered in flight, Tollmien-Schlichting (T-S) waves are the dominating mechanism to trigger 'natural' laminar-turbulent transition for boundary layers developing on smooth two-dimensional surfaces. However, most conventional wind tunnels have disturbance levels much higher than in flight which can cause the mechanism of 'natural' transition to be changed or bypassed. Stability theory has been used to demonstrate that on a flat plate in subsonic flow an increasing unit Reynolds number leads to an increase in transition Reynolds number, which is also referred to as 'unit Reynolds number effect'. However, there is only limited experimental verification of this effect for highly subsonic conditions in low turbulence environments. In this work we show a systematic experimental investigation of pressure gradients (dcp/dx = -1.2 to 0.25 1/m), Mach numbers (M = 0.35 to 0.65) and unit Reynolds numbers (Re=17.5E6 to 80.0E6 1/m).

Item URL in elib:https://elib.dlr.de/118617/
Document Type:Conference or Workshop Item (Speech)
Additional Information:L-12-Risius; USB-Stick; Conference-Proceedings
Title:Experimental investigation of unit Reynolds number and pressure gradient effects on two-dimensional boundary layer transition
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Risius, Steffensteffen.risius (at) dlr.dehttps://orcid.org/0000-0002-5530-9609
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Hein, StefanStefan.Hein (at) dlr.deUNSPECIFIED
Klein, ChristianChristian.Klein (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Unit Reynolds number effect, laminar-turbulent transition, Cryogenic Ludwig Tube (DNW-KRG), PaLASTra, Temperature-Sensitive Paint (TSP), Tollmien-Schlichting, critical N-factor, COCO, LILO
Event Title:17th ONERA-DLR Aerospace Symposium
Event Location:Aussois, Frankreich
Event Type:international Conference
Event Dates:07.-09. Jun. 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:31 Jan 2018 11:41
Last Modified:05 Sep 2018 15:27

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.