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Transonic buffet of a space launcher aileron: Fanno and Rayleigh flow analogies

Gourdain, Nicolas and Dumon, Jéromine and Bury, Yannick and Molton, Pascal Transonic buffet of a space launcher aileron: Fanno and Rayleigh flow analogies. (2021) International Journal of Numerical Methods for Heat & Fluid Flow. ISSN 0961-5539

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Official URL: http://doi.org/10.1108/HFF-07-2021-0506

Abstract

The transonic buffet is a complex aerodynamics phenomenon that imposes severe constraints on the design of high-speed vehicles, including for aircraft and space launchers. The origin of the buffet is still debated in the literature, and the control of this phenomenon remains difficult. The present work proposes an original scenario to explain the origin of buffet, which in turn opens promising perspectives for its alleviation and attenuation. This work relies on the use of numerical simulations, with the idea to reproduce the buffet phenomenon in a transonic aileron designed for small space launchers. Two numerical approaches are tested: Unsteady Reynolds Averaged Navier-Stokes (URANS) and Large-Eddy Simulation (LES). The numerical predictions are first validated against available experimental data, before being analysed in detail to identify the origin of the buffet on the studied configuration. A complementary numerical study is then conducted to assess the possibility to delay the onset of buffet. The buffet control strategy is based on wall cooling. By adequately choosing the wall temperature, this work shows that it is feasible to delay the emergence of the buffet. More precisely, this paper highlights the crucial role of the subsonic flow inside the boundary layer, showing the existence of upstream traveling pressure waves that are responsible for the flow coupling between both sides of the airfoil, at the origin of the buffet phenomenon.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
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Deposited On:12 Jan 2022 11:43

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