Exploratory study of turbulent structure of a compressible shear layer using fluctuating pitot pressure measurements

Abstract

An experimental study has been conducted to determine if two-point fluctuating pitot pressure measurements can be used to detect and quantify the large-scale structures in a two-dimensional, high Reynolds number, supersonic, turbulent shear layer. There is evidence from the two-point correlations of fluctuating pitot pressures and from the VITA analysis that large-scale structures exist and span the thickness of the shear layer. Because the shear layer exhibits a wake-like character, the large-scale structure in the lower part of the shear layer is essentially normal to the flow direction. Power spectra measured at about 25 initial shear layer thicknesses downstream of the origin are broadband, which suggests that the large-scale structures are not yet highly organized.

Simulation of Compressible Multi-Phase Turbulent Reacting Flows

“…These results are in agreement with some experimental observations [50] where an increase in the growth rate was observed following the interaction with the shocks, with a relaxation to the un-disturbed levels observed within some short distance from the point of impact. It should also be noted, as pointed out by Drummond et at [15], that the shocks interaction also impact the static temperature within the layer, hence enhancing the reactions rates in the mixing zone.…”