Unsteady Transonic Fluid - Structure - Interaction at the BAC 3-11 High Aspect Ratio Swept Wing

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Unsteady Transonic Fluid - Structure - Interaction at the BAC 3-11 High Aspect Ratio Swept Wing

Steimle, P. C. / Schröder, W. / Klaas, M.

Abstract A comprehensive analysis of experimental results from several wind tunnel test campaigns is presented. The experiments were conducted in the subproject B6 of the Collaborative Research Center SFB 401. The main focus of this research is the interaction of unsteady aerodynamic phenomena in transonic flow over a supercritical BAC 3-11/RES/30/21 high aspect ratio swept wing configuration in the context of aeroelastic instabilities occurring at modern transport type wing configurations. The fluid-structure-interaction is simulated using a simplified aeroelastic test setup with harmonic forcing in the bending and torsional wing degree of freedom. The interaction between shock wave and turbulent separation is the most essential feature in the unsteady wing flow leading to a distinct self-induced oscillation of the flow field. Flow cases with incipient separation and with full scale shock induced separation at Mach numbers 0.86 and 0.92 are compared showing the interference effects of self-induced shock oscillations with the harmonically oscillating wind tunnel model. The results demonstrate the self-limiting nature of the unsteady flow with incipient separation and the aeroelastic coupling in the presence of shock induced separation.