Abstract

Flow field investigations were carried out in a backward-facing single-sided step flow with variation of the wall inclination angle. The aim of this investigation was to determine the differences in turbulent flow field quantities when compared to the 90° step geometry. The inclination angle was varied between 10° and 90°. Reynolds numbers (based on step height H) were realized up to 64000. Additionally, the influence of the expansion ratio on the flow field was to investigate with three different ratios 1.48, 2.0, 3.27. Velocity data were measured by laser Doppler anemometry allowing to determine integral flow quantities as e.g. separation streamlines or reattachment lengths. The experiments should both, contribute to the understanding of the phenomenology of separated flows and establish a comprehensive data base for the validation of numerical codes.

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