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SHOCK-WAVE SYSTEM ANALYSIS FOR COMPRESSION-DECOMPRESSION RAMP FLOW

Maxim Loginov
Lehrstuhl fur Aerodynamik, Technische Universitat Munchen Boltzmannstr. 15, D-85748 Garching, Germany; Khristianovich Institute of Theoretical and Applied Mechanics, Russian Academy of Sciences, Siberian Branch, Novosibirsk 630090, Russia

Nikolaus A. Adams
Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technical University of Munich, 85748 Garching bei München, Germany

Alexander A. Zheltovodov
Khristianovich Institute of Theoretical and Applied Mechanics, Russian Academy of Sciences, Siberian Branch, Novosibirsk 630090, Russia

Résumé

Well-resolved Large-Eddy Simulations (LES) are performed in order to investigate flow phenomena and turbulence structure of the turbulent boundary layer along a supersonic compression-decompression ramp. The simulations reproduce directly a reference experiment with a free-stream Mach number of Ma = 2.95 and a Reynolds number based on the incoming boundary-layer thickness of Reδ0 = 63560. An analysis of the results shows a good agreement with the reference experiment in terms of mean quantities and turbulence structure. The computational data confirm theoretical and experimental results on fluctuation-amplification across the interaction region. In the wake of the main shock a shedding of shocklets is observed which are annihilated subsequently by the expansion near the decompression corner. The development of large-scale streamwise vortices in the vicinity of the successive compression and decompression corners is analyzed and support for a Görtler-like generation mechanism is provided.