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Schlieren-based techniques for investigating instability development and transition in a hypersonic boundary layer

Laurence, Stuart and Wagner, Alexander and Hannemann, Klaus (2014) Schlieren-based techniques for investigating instability development and transition in a hypersonic boundary layer. Experiments in Fluids, 55 (8), pp. 1-17. Springer. DOI: 10.1007/s00348-014-1782-9 ISSN 0723-4864

Full text not available from this repository.

Official URL: http://link.springer.com/journal/348/55/8/page/1

Abstract

Three variants of schlieren techniques are employed to investigate the development of second-mode instability waves in the hypersonic boundary layer of a slender cone in a reflected shock tunnel. First a previously proposed technique using high-frame-rate (i.e., at least as high as the dominant instability frequency) schlieren visualization with a continuous light source is shown to provide repeatable measurements of the instability propagation speed and frequency. A modified version of the technique is then introduced whereby a pulsed light source allows the use of a higher resolution camera with a lower frame rate: this provides significant benefits in terms of spatial resolution and total recording time. A detailed picture of the surface-normal intensity distribution for individual wave packets is obtained, and the fundamentally unsteady nature of the transition process under the present experimental conditions emerges. Finally, two-point schlieren deflectometry is implemented and shown to be capable of providing second-mode growth information in the challenging shock-tunnel environment.

Item URL in elib:https://elib.dlr.de/87005/
Document Type:Article
Additional Information:Published online: 23. July 2014, Paper 1782
Title:Schlieren-based techniques for investigating instability development and transition in a hypersonic boundary layer
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laurence, Stuartstuart.laurence (at) umd.eduUNSPECIFIED
Wagner, Alexanderalexander.wagner (at) dlr.deUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:55
DOI :10.1007/s00348-014-1782-9
Page Range:pp. 1-17
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:hypersonic boundary layer, high-frame-rate, surface-normal intensity distribution, hypersonic flows, schlieren-based techniques
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 - Numerische Verfahren und Simulation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:15 Sep 2014 13:07
Last Modified:06 Sep 2019 15:25

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