DOI: 10.1615/TSFP5
SHOCK-WAVE SYSTEM ANALYSIS FOR COMPRESSION-DECOMPRESSION RAMP FLOW
ABSTRACT
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.