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Open AccessArticle

Pulsed Blowing Interacting with a Leading-Edge Vortex

Department of Mechanical Engineering, Chair of Aerodynamics and Fluid Mechanics, Technical University of Munich, Boltzmannstr. 15, 85748 Garching by Munich, Germany
Author to whom correspondence should be addressed.
Aerospace 2020, 7(1), 4;
Received: 7 November 2019 / Revised: 9 December 2019 / Accepted: 28 December 2019 / Published: 10 January 2020
(This article belongs to the Special Issue Aeronautical Systems for Flow Control)
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 flow mechanisms involving jet–vortex and vortex–vortex interactions and the disturbance convection through the flow field are little understood. This paper reports on the unsteady flow field 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. View Full-Text
Keywords: leading-edge vortex; active flow control; pulsed blowing; detached eddy simulation leading-edge vortex; active flow control; pulsed blowing; detached eddy simulation
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Buzica, A.; Breitsamter, C. Pulsed Blowing Interacting with a Leading-Edge Vortex. Aerospace 2020, 7, 4.

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