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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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.
|Title:||Numerical Investigation of Hypersonic Wall-Bounded Shear Flows - Part 2: Entropy-Layer Instability in Blunt Cone Flows|
|Journal or Publication Title:||ERCOFTAC Bulletin|
|In ISI Web of Science:||No|
|Page Range:||pp. 57-60|
|Keywords:||hypersonic blunt cone, entropy-layer instability, linear instability analysis|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L - no assignement|
|DLR - Research theme (Project):||["eprint_fieldopt_dlr_project_search_L000" not defined]|
|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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