Transonic Buffet Control on 3D Turbulent Wings using Fluidic Devices. Part 1: Open loop study

Abstract : This paper presents an overview of the work performed at Onera over the last decade 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 improve aircraft performance, 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. The objective of these wind tunnel tests was to prepare the closed-loop control of the buffet phenomenon, to adapt the mass flow rate to the aerodynamic conditions.
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J. Dandois, J. Dor, P. Molton, A. Lepage, F. Ternoy, et al.. Transonic Buffet Control on 3D Turbulent Wings using Fluidic Devices. Part 1: Open loop study. 3rd GDR symposium "Flow Separation Control", Nov 2013, LILLE, France. ⟨hal-01058605⟩

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