Active boundary layer tripping using oscillatory vorticity generator

Tal Yehoshua*, Avi Seifert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)175-180
Number of pages6
JournalAerospace Science and Technology
Volume10
Issue number3
DOIs
StatePublished - Apr 2006

Keywords

  • Actuators
  • Flow control
  • Laminar boundary layer
  • Oscillatory vorticity generators
  • Transition
  • Turbulence

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