Comptes Rendus
Separation flow control
Open and closed-loop control of transonic buffet on 3D turbulent wings using fluidic devices
Comptes Rendus. Mécanique, Volume 342 (2014) no. 6-7, pp. 425-436.

This paper presents an overview of the work performed recently at ONERA on the control of the buffet phenomenon. This aerodynamic instability induces strong wall pressure fluctuations and as such limits aircraft envelope; consequently, it is interesting to try to delay its onset, in order to enlarge aircraft flight envelop, but also to provide more flexibility during the design phase. Several types of flow control have been investigated, either passive (mechanical vortex generators) or active (fluidic VGs, fluidic trailing-edge device (TED)). It is shown than mechanical and fluidic VGs are able to delay buffet onset in the angle-of-attack domain by suppressing the separation downstream of the shock. The effect of the fluidic TED is different, the separation is not suppressed, but the rear wing loading is increased and consequently the buffet onset is not delayed to higher angles of attack, but only to higher lift coefficient. Then, a closed loop control methodology based on a quasi-static approach is defined and several architectures are tested for various parameters such as the input signal, the objective function or, the tuning of the feedback gain. All closed loop methods are implemented on a dSPACE device calculating in real time the fluidic actuators command from the unsteady pressure sensors data.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2014.01.015
Keywords: Transonic, Buffet, Separation control, Vortex generator, Fluidic control, Closed-loop control

Julien Dandois 1; Arnaud Lepage 1; Jean-Bernard Dor 1; Pascal Molton 1; Frédéric Ternoy 1; Arnaud Geeraert 1; Vincent Brunet 1; Éric Coustols 1

1 ONERA – The French Aerospace Lab, 8, rue des Vertugadins, 92190 Meudon, France
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     title = {Open and closed-loop control of transonic buffet on {3D} turbulent wings using fluidic devices},
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Julien Dandois; Arnaud Lepage; Jean-Bernard Dor; Pascal Molton; Frédéric Ternoy; Arnaud Geeraert; Vincent Brunet; Éric Coustols. Open and closed-loop control of transonic buffet on 3D turbulent wings using fluidic devices. Comptes Rendus. Mécanique, Volume 342 (2014) no. 6-7, pp. 425-436. doi : 10.1016/j.crme.2014.01.015. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.01.015/

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[2] J. Dandois; P. Molton; A. Lepage; A. Geeraert; V. Brunet; J.-B. Dor; É. Coustols Buffet characterisation and control for turbulent wings, Aerosp. Lab. J., Volume 6 (2013) http://www.aerospacelab-journal.org

[3] G. Browaeys; H. Deniau; E. Collin; J.-P. Bonnet Pneumatic control strategies for transonic buffet. A numerical approach, Limassol, Cyprus (2008)

[4] P. Molton; J. Dandois; A. Lepage; V. Brunet; R. Bur Control of buffet phenomenon on a transonic swept wing, AIAA J., Volume 51 (2013) no. 4, pp. 761-772

[5] J. Dandois; V. Brunet; P. Molton; J.-C. Abart; A. Lepage Buffet control by means of mechanical and fluidic vortex generators, 5th AIAA Flow Control Conference (2010) (AIAA paper 2010-4975, Chicago, IL)

[6] F. Ternoy; J. Dandois; F. David; M. Pruvost Overview of ONERA actuators for active flow control, Aerosp. Lab. J., Volume 6 (2013) http://www.aerospacelab-journal.org

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