Pulsed blowing interacting with a leading-edge vortex

Andrei Buzica, Christian Breitsamter

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Manipulation of vortex instabilities for aerodynamic performance increase is of great interest in numerous aeronautical applications. With increasing angle of attack, the leading-edge vortex of a semi-slender delta wing becomes unsteady and eventually collapses, endangering the flight stability. Hence, active flow control by pulsed blowing stabilizes the vortex system, enlarging the flight envelope for such wing configurations. The most beneficial outcome is the reattachment of the separated shear layer during post-stall, contributing to a lift increase of more than 50%. In contrast to high power consuming brute-force actuation, manipulating the flow instabilities offers a more efficient alternative for mean flow field control, which has direct repercussions on the aerodynamic characteristics. However, the flowmechanisms involving jet-vortex and vortex-vortex interactions and the disturbance convection through the flowfield are little understood. This paper reports on the unsteady flowfield above a generic half delta wing model with a 65° sweep angle and its response to periodic blowing. Numerical and experimental results are presented and discussed in a synergistic manner.

Original languageEnglish
Article number4
JournalAerospace
Volume7
Issue number1
DOIs
StatePublished - 1 Jan 2020

Keywords

  • Active flow control
  • Detached eddy simulation
  • Leading-edge vortex
  • Pulsed blowing

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