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- W25750039 abstract "The combined impact of irregular surface roughness and moderate favorable-pressuregradient conditions (K … 2:5 £ 10 i7 ) on the structure of a turbulent boundary layer was assessed using two-dimensional particle image velocimetry (PIV) measurements in the streamwise{wall-normal plane. The roughness under consideration was replicated from a turbine blade damaged by deposition of foreign materials and contains a broad range of topographical scales. These measurements were compared to measurements of smooth-wall ∞ow under both identical favorable-pressure-gradient (FPG) conditions as well as zeropressure-gradient (ZPG) conditions in order to reveal the synergistic impact of roughness and FPG conditions on the underlying structure of the ∞ow. While vortex organization was found to persist under both smooth- and rough-wall FPG conditions, its characteristics were altered compared to smooth-wall ZPG ∞ow. In particular, inspection of instantaneous velocity flelds revealed this organization to be focused closer to the wall in the smooth-wall FPG case, with a shallower inclination angle noted as well as an elongated streamwise extent. In contrast, the rough-wall FPG results revealed packet structures more consistent with the smooth-wall ZPG case, indicating that roughness mitigates the FPG-induced focusing of these structural attributes toward the wall. Two-point correlations coe‐cients of streamwise velocity support these instantaneous observations." @default.
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- W25750039 date "2010-11-22" @default.
- W25750039 modified "2023-09-26" @default.
- W25750039 title "Combined Roughness and Favorable Pressure Gradient Effects in a Turbulent Boundary Layer" @default.
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