Active boundary layer tripping using oscillatory vorticity generator

The evolution of a train of vortex pairs ejected from a zero-net-mass-flux excitation slot into a Blasius boundary layer was studied experimentally, with the aim of active boundary layer tripping. The excitation was directed upstream or downstream, at a shallow angle, or perpendicular to the surface...

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Bibliographic Details
Published inAerospace science and technology Vol. 10; no. 3; pp. 175 - 180
Main Authors Yehoshua, Tal, Seifert, Avi
Format Journal Article
LanguageEnglish
Published Elsevier SAS 01.04.2006
Subjects
Actuators
Flow control
Laminar boundary layer
Oscillatory vorticity generators
Transition
Turbulence
Flow control
Transition
Actuators
Turbulence
Laminar boundary layer
Oscillatory vorticity generators
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Summary:The evolution of a train of vortex pairs ejected from a zero-net-mass-flux excitation slot into a Blasius boundary layer was studied experimentally, with the aim of active boundary layer tripping. The excitation was directed upstream or downstream, at a shallow angle, or perpendicular to the surface. Vorticity, circulation, trajectories and convection speeds were calculated and used to describe the vortices' evolution. Intermittency, spectra and mean velocity profiles of the forced boundary layer were measured, in addition to the PIV data. It was found that periodic excitation is very effective for promoting sub-critical transition. More effective, abrupt, boundary layer tripping was identified when the excitation was directed upstream at shallow angle to the surface.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1270-9638
1626-3219
DOI:10.1016/j.ast.2005.10.007