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Wake flow instability studies behind discrete roughness elements on a generic re-entry capsule

Theiß, Alexander and Hein, Stefan and Syed Raza, Christopher Ali and Radespiel, Rolf (2016) Wake flow instability studies behind discrete roughness elements on a generic re-entry capsule. 46th AIAA Fluid Dynamics, AIAA Aviation and Aeronautics Forum and Exposition 2016, 13.-17.Juni 2016, USA, Washington DC.

Full text not available from this repository.

Official URL: http://www.aiaa-aviation.org/?_ga=1.164865791.1563248225.1454663403

Abstract

Numerical and experimental results on disturbance growth in the wake flow downstream of a roughness element submerged in the boundary layer of a typical re-entry capsule at an angle of attack are presented. Laminar basic flow computations were conducted at Mach 5.9 freestream conditions of the Hypersonic Ludwieg Tube Braunschweig (HLB) for different roughness heights, widths and planform shapes. The modal instability characteristics of the wake flow were studied by spatial two-dimensional eigenvalue analysis and three-dimensional parabolized stability equations. For all cases considered, the varicose wake modes are most amplified in terms of maximum N-factors. A comparison of the disturbance kinetic energy production terms reveals that the wall-normal shear is mainly responsible for the dominant instability modes. A flush-mounted high frequency pressure transducer (PCB) is used to measure the wall-pressure fluctuation of the instability modes behind a cylindrical element at various Reynolds numbers. A comparison of the spectral distributions of pressure fluctuations with and without roughness clearly shows the appearance of distinct spectral humps.

Item URL in elib:https://elib.dlr.de/104699/
Document Type:Conference or Workshop Item (Speech)
Additional Information:AIAA Online
Title:Wake flow instability studies behind discrete roughness elements on a generic re-entry capsule
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Theiß, Alexanderalexander.theiss (at) dlr.deUNSPECIFIED
Hein, Stefanstefan.hein (at) dlr.deUNSPECIFIED
Syed Raza, Christopher AliTU BraunschweigUNSPECIFIED
Radespiel, RolfTU BraunschweigUNSPECIFIED
Date:June 2016
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:re-entry capsule, blunt body, transition, 2D spatial LST, PSE-3D, discrete surface roughness, measurement of wake flow instabilities
Event Title:46th AIAA Fluid Dynamics, AIAA Aviation and Aeronautics Forum and Exposition 2016
Event Location:USA, Washington DC
Event Type:international Conference
Event Dates:13.-17.Juni 2016
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 - Military Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Bachmann, Barbara
Deposited On:11 Jul 2016 09:25
Last Modified:12 Jan 2017 16:09

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