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Steady longitudinal vortices in supersonic turbulent separated flows

Schülein, Erich and Trofimov, Victor (2011) Steady longitudinal vortices in supersonic turbulent separated flows. Journal of Fluid Mechanics, Vol. 672, pp. 451-476. Cambidge University Press. doi: 10.1017/S0022112010006105.

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Official URL: http://journals.cambridge.org


Large-scale longitudinal vortices in high-speed turbulent separated flows caused by relatively small irregularities at the model leading edges or at the model surfaces are investigated in this paper. Oil-flow visualization and infrared thermography techniques were applied in the wind tunnel tests at Mach numbers 3 and 5 to investigate the nominally 2-D ramp flow at deflection angles of 20◦, 25◦ and 30◦. The surface contour anomalies have been artificially simulated by very thin strips (vortex generators) of different shapes and thicknesses attached to the model surface. It is shown that the introduced streamwise vortical disturbances survive over very large downstream distances of the order of 10000 vortex-generator heights in turbulent supersonic flows without pressure gradients. It is demonstrated that each vortex pair induced in the reattachment region of the ramp is definitely a child of a vortex pair, which was generated originally, for instance, by the small roughness element near the leading edge. The dependence of the spacing and intensity of the observed longitudinal vortices on the introduced disturbances (thickness and spanwise size of vortex generators) and on the flow parameters (Reynolds numbers, boundary-layer thickness, compression corner angles, etc.) has been shown experimentally.

Item URL in elib:https://elib.dlr.de/58062/
Document Type:Article
Title:Steady longitudinal vortices in supersonic turbulent separated flows
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:31 March 2011
Journal or Publication Title:Journal of Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 672
DOI :10.1017/S0022112010006105
Page Range:pp. 451-476
Publisher:Cambidge University Press
Keywords:boundary-layer separation, free shear layers, high-speed flow
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
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: Schülein, Dr.rer.nat. Erich
Deposited On:16 Feb 2009
Last Modified:08 Mar 2018 18:42

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