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Session: Control of separated/unsteady flows I
Session starts: Wednesday 05 November, 15:40
Presentation starts: 16:00
Room: Commission roon 2

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Deepak Prem Ramaswamy (Bundeswehr University Munich)
Eric Ibarra (Bundeswehr University Munich)
Sven Scharnowski (Bundeswehr University Munich)
Christian J. Kähler (Bundeswehr University Munich)

Abstract:
Modern commercial aircraft increasingly operate in the transonic flow regime, where local flow velocities on the suction side of a supercritical wing can exceed the sonic limit and terminate in a shock wave. While the flow field is generally stable, it can become highly unsteady for certain combinations of angle of attack, Mach number (M), and Reynolds number (Re). This dynamic flow instability is commonly referred to as transonic buffet and manifests as a large-scale, self-sustained periodic oscillation of the shock wave, accompanied by significant variations in shock strength and periodic thickening and thinning of the downstream shock-induced separation. It results in pronounced oscillations in lift coefficients, induces strong fluctuating aerodynamic loads on the airframe accompanied by intense vibrations (buffeting), and imposes a substantial drag penalty. Consequently, the operational envelope of the aircraft is constrained, and both safety and performance are adversely affected. In this study, we aim to use a single row of spanwise-inclined AJVGs to attenuate transonic buffet over a rigid OAT15A wind tunnel model. The primary effects of jet injection pressure on control effectiveness will be examined across different flow regimes, ranging from pre-buffet and buffet onset to fully developed buffet and buffet offset conditions.