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Numerical Investigation of Hypersonic Wall-Bounded Shear Flows - Part 2: Entropy-Layer Instability in Blunt Cone Flows

Hein, Stefan (2007) Numerical Investigation of Hypersonic Wall-Bounded Shear Flows - Part 2: Entropy-Layer Instability in Blunt Cone Flows. ERCOFTAC Bulletin, 74, pp. 57-60.

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Abstract

The entropy-layer instability of an axisymmetric blunt cone flow at Mach 8 is studied numerically for the free-stream conditions of the experiments of Stetson et al. Weakly amplified disturbances dominated by temperature and density fluctuations inside the un-swallowed entropy-layer are found at the same frequencies as in experiment. The corresponding amplitude functions have a distinct maximum at a generalised inflection point located in the entropy layer above the viscous boundary layer as noted by Stetson et al. The numerical results show that this entropy-layer instability mode is most amplified for zero wave angle. Downstream of the position where the entropy layer has been swallowed by the growing boundary layer these entropy-layer instabilities are damped.

Document Type:Article
Title:Numerical Investigation of Hypersonic Wall-Bounded Shear Flows - Part 2: Entropy-Layer Instability in Blunt Cone Flows
Authors:
AuthorsInstitution or Email of Authors
Hein, StefanUNSPECIFIED
Date:August 2007
Journal or Publication Title:ERCOFTAC Bulletin
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:74
Page Range:pp. 57-60
Status:Published
Keywords:hypersonic blunt cone, entropy-layer instability, linear instability analysis
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Dr.-Ing. Stefan Hein
Deposited On:11 Dec 2007
Last Modified:15 Jan 2010 01:34

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