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.
Item URL in elib: | https://elib.dlr.de/50914/ | ||||||
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Document Type: | Article | ||||||
Title: | Numerical Investigation of Hypersonic Wall-Bounded Shear Flows - Part 2: Entropy-Layer Instability in Blunt Cone Flows | ||||||
Authors: |
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Date: | August 2007 | ||||||
Journal or Publication Title: | ERCOFTAC Bulletin | ||||||
Refereed publication: | No | ||||||
Open Access: | No | ||||||
Gold Open Access: | 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 assignment | ||||||
DLR - Research theme (Project): | L - no assignment (old) | ||||||
Location: | Göttingen | ||||||
Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Helicopters | ||||||
Deposited By: | Hein, Dr.-Ing. Stefan | ||||||
Deposited On: | 11 Dec 2007 | ||||||
Last Modified: | 15 Jan 2010 01:34 |
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