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Experiments on a smooth wall hypersonic boundary layer at Mach 6

Neeb, Dominik and Saile, Dominik and Gülhan, Ali (2018) Experiments on a smooth wall hypersonic boundary layer at Mach 6. Experiments in Fluids, 59 (4), pp. 1-21. Springer. DOI: 10.1007/s00348-018-2518-z ISBN 0723-4864 ISSN 0723-4864

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Official URL: https://link.springer.com/article/10.1007/s00348-018-2518-z

Abstract

The turbulent boundary layer along the surface of high-speed vehicles drives shear stress and heat flux. Although essential to the vehicle design, the understanding of compressible turbulent boundary layers at high Mach numbers is limited due to the lack of available data. This is particularly true if the surface is rough, which is typically the case for all technical surfaces. To validate a methodological approach, as initial step, smooth wall experiments were performed. A hypersonic turbulent boundary layer at Ma = 6 (Ma_e = 5.4) along a 7° sharp cone model at low Reynolds numbers Re_theta = 3000 was characterized. The mean velocities in the boundary layer were acquired by means of Pitot pressure and particle image velocimetry (PIV) measurements. Furthermore, the PIV data were used to extract turbulent intensities along the profile. The mean velocities in the boundary layer agree with numerical data, independent of the measurement technique. Based on the profile data, three different approaches to extract the skin friction velocity were applied and show favorable comparison to literature and numerical data. The extracted values were used for inner and outer scaling of the van Driest transformed velocity profiles which are in good agreement to incompressible theoretical data. Morkovin scaled turbulent intensities show ambiguous results compared to literature data which may be influenced by inflow turbulence level, particle lag and other measurement uncertainties.

Item URL in elib:https://elib.dlr.de/121730/
Document Type:Article
Title:Experiments on a smooth wall hypersonic boundary layer at Mach 6
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neeb, DominikDLRhttps://orcid.org/0000-0002-5848-3055
Saile, DominikDominik.Saile (at) dlr.dehttps://orcid.org/0000-0002-4631-2072
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Date:22 March 2018
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:59
DOI :10.1007/s00348-018-2518-z
Page Range:pp. 1-21
Publisher:Springer
ISSN:0723-4864
ISBN:0723-4864
Status:Published
Keywords:hypersonics, turbulent boundary layer, PIV, Pitot pressure, skin friction, Morkovin's hypothesis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Rückkehrtechnologie
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Neeb, Dominik
Deposited On:11 Dec 2018 10:20
Last Modified:06 Sep 2019 15:25

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