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Experiments on stream-wise streaky structures in a laminar separation bubble

Boiko, Andrey V. and Dovgal, Alexander V. and Hein, Stefan (2005) Experiments on stream-wise streaky structures in a laminar separation bubble. DLR-Interner Bericht. DLR-IB 224-2005 A 18, 27 S.

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Abstract

Wind-tunnel data on stationary streaky structures developing in a laminar flow behind backward-facing step on a flat plate are reported. The streaks are generated in a controlled manner by three-dimensional surface humps placed periodically close to the separation line and spaced in the span-wise direction. The mean flow distortions of the separation region created in this way are investigated through hot-wire measurements. As a result, details on evolution of the stationary perturbations in the separation region are elucidated as well as their effects upon the separated flow which are of interest due to elaboration of perspective methods for control of low-speed aerodynamics.

Document Type:Monograph (DLR-Interner Bericht)
Title:Experiments on stream-wise streaky structures in a laminar separation bubble
Authors:
AuthorsInstitution or Email of Authors
Boiko, Andrey V.ITAM
Dovgal, Alexander V.ITAM
Hein, StefanUNSPECIFIED
Date:2005
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:27
Status:Published
Keywords:Separation bubble, backward-facing step, transient growth, streaky structures, flow instability, separation control
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Elisabeth Winkels
Deposited On:24 Jan 2006
Last Modified:14 Jan 2010 20:12

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