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Stability analysis of hypersonic flow over a backstep in chemical equilibrium

Perez, Jose Miguel and Franco, Juan Alberto and Paredes, Pedro and Hein, Stefan and Hannemann, Volker and Theofilis, Vassilios (2015) Stability analysis of hypersonic flow over a backstep in chemical equilibrium. 3rd TRR40 Summer Research Program, 20. Juli - 14. Aug. 2015, München.

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Official URL: http://www.sfbtr40.de


The purpose of this work is to shed light on the role of chemical equilibrium in the global instabilities that arise in hypersonic non-parallel flows. For this end, the stability of temporal evolving disturbances on a hypersonic flow over a backstep are examined by the linearized Navier-Stokes equations. The flow conditions are unit Reynolds number equal to 6.6 x 10^6 1/m, boundary-layer edge temperature 350 K and freestream Mach number 10. The step height is equal to the local displacement thickness. For these conditions the two-dimensional laminar base flow is computed with the full Navier-Stokes solver TAU software. The results for a given wave number of the perturbations in the homogeneous direction shows that the leading linear mode located around the recirculation bubble is unstable in both cases. The real gas effects increase the temporal growth rate of the leading mode. This instability corresponds to a zero-frequency global linear instability. The spectrum and the structure of the leading mode for real and perfect gas are presented and compared.

Item URL in elib:https://elib.dlr.de/98783/
Document Type:Conference or Workshop Item (Other)
Title:Stability analysis of hypersonic flow over a backstep in chemical equilibrium
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Perez, Jose MiguelUniversidad Politecnica de MadridUNSPECIFIED
Franco, Juan Albertojuan.franco (at) dlr.deUNSPECIFIED
Paredes, PedroNASA Langley Research CenterUNSPECIFIED
Hein, Stefanstefan.hein (at) dlr.deUNSPECIFIED
Hannemann, Volkervolker.hannemann (at) dlr.deUNSPECIFIED
Theofilis, VassiliosUniversidad Politecnica de MadridUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Sonderforschungsbereich/Transregio 40 – Summer Program Report 2015
Keywords:laminar-turbulent transition, hypersonic, backward-facing step
Event Title:3rd TRR40 Summer Research Program
Event Location:München
Event Type:Other
Event Dates:20. Juli - 14. Aug. 2015
Organizer:SFB TRR40, Technische Universität München
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Micknaus, Ilka
Deposited On:23 Nov 2015 15:20
Last Modified:10 May 2016 23:33

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